97 research outputs found
Consolidation And Break-up Of The South American Platform In Southeastern Brazil: Tectonothermal And Denudation Histories
No full textThe different tectonic stages that occurred at the end of the Proterozoic and during the Phanerozoic have an important bearing on the tectonothermal history of the South American Platform and its consolidation. Geochronological data (U/Pb monazite, 40Ar/39Ar whole rock) and apatite fission-track analysis, from Precambrian rocks of the southeastern Brazilian coastline, permit the modeling of a long-term thermal history of the crust and constrain variable denudation rates. Using these data, a temperature-time diagram reflects a period of accelerated exhumation during the end of the Brasiliano Orogeny, followed by long stability and reactivation of the platform during the Rifting Phase of the South Atlantic Ocean. U/Pb zircon and monazite (blocking temperature of ca. 650°C) data from a series of igneous bodies suggest that a tangential and transpressional tectonic regime occurred between 625 and 610 Ma. During the following escape tectonics, between 610 and 590 Ma the exhumation process indicates cooling rates of ca. 12°C/Ma. 40Ar/39Ar biotite ages between 540 and 510 Ma (ca. 300°C) and a corrected fission-track age on apatites (100°C) of 480 Ma indicate an exhumation event related to block tectonics with huge vertical displacement along shear zones. A long stabilization phase, with low exhumation, and cooling rate around 0.25°C/Ma was recorded from the Cambro/Ordovician to the Mesozoic. At 65 Ma an acceleration of the exhumation through denudation and reworking of the South American surface with cooling rate of 1.5°C/Ma is observed. The uplift of the Mantiqueira and Serra do Mar mountain ranges along the southeast Brazilian coastline works as a climatic barrier provoking lateral erosional processes causing long-term scarp retreat, combined with intense, but progressive denudation towards the continent. A denudation of 2.5 to 4 km was calculated for such processes. This lateral retreat of escarpments and flexural response can provide important insights regarding marginal isostatic uplift and the evolution of offshore sedimentary basins of southeast Brazil.7191101de Almeida, F.F.M., (1976) The System of Continental Rifts Bordering the Santos BasinAnais Da Academia Brasileira de Ciências, 48 (SUPPL.), pp. 13-26de Almeida, F.F.M., Carneiro, C.D.R., Origem e evolução da Serra do Mar (1998) Revista Brasileira de Geociências, 28, pp. 135-150Amaral, G., Born, H., Hadler, N.J.C., Iunes, P.J., Kawashita, K., Machado Jr., D.L., Oliveira, E.P., Tello Sáenz, C.A., Fission track analysis of apatites from Sāo Francisco craton and Mesozoic alcaline - Carbonatite complexes from central and southeastern Brazil (1997) J. S. Amer. Earth Sci., 10, pp. 285-294Bigazzi, G., Guedes, S., Hadler, N.J.C., Iunes, P.J., Odone, M., Osorio, A.M., Paulo, S.R., Zuniga, A., Potentialities and practical limitations of absolute neutron dosimetry using thin films of uranium and thorium applied to the fission track dating (1999) Radiation Meassurements, 31, pp. 651-656Bigazzi, G., Guedes, S., Hadler, N.J.C., Iunes, P.J., Paluo, S.R., Tello, S.C.A., Application of neutron dosymetry by natural uranium and thorium thin flims in fission tracks dating (2000) Book of Extended Abstracts of 9th International Conference on Fission Track Dating and Termocronology, pp. 33-35. , Lorne, AustraliaBurbank, D.W., Anderson, R.S., (2001) Tectonic Geomorphology, p. 274. , Blackwell SciColtrinari, L., (1974) Contribuiçāo à Geomorfologia Da Região Guaratinguetá - Aparecida, p. 156. , Doctoral Thesis, Universidade de Sāo Paulo (Instituto de Geografia), Sāo Paulo (SP)Dantas, E.L., Hackspacher, P.C., Fetter, A.H., Sato, K., Pimentel, M.M., Godoy, A.M., Nd isotope systematics related to Proterozoic evolution of the Central Ribeira Belt in the State of Sāo Paulo, SE Brazil (2000) Revista Brasileira de Geociências, 30, pp. 140-143Gallagher, K., Brown, R.W., Johnson, C.J., Geological applications of fission track analysis (1998) Ann. Rev. Earth Planet. Sci., 26, pp. 519-572Gilchrist, A.R., Summerfield, M.A., Differential denutation and flexural isostasy in formation of rifted - Margin upwarps (1990) Nature, 346, pp. 739-742Green, P.F., Duddy, I.R., Gleadow, A.J.W., Tingate, P.R., Laslett, G.M., Thermal annealing of fission tracks in apatite, 1. A qualitative description (1986) Chem. Geol. (Isotopic Geoscience Section), 59, pp. 237-253Green, P.F., Duddy, I.R., Laslett, G.M., Hegarty, K.A., Gleadow, A.J.W., Lovering, J.F., Thermal annealing of fission track in apatite 4: Qualitative modeling techniques and extension to geological timescales (1989) Chem. Geol. (Isotopic Geoscience Section), 79, pp. 155-162Guedes, S., Hackspacher, P.C., Hadler, N.J.C., Iunes, P.J., Paulo, S.R., Ribeiro, L.F.B., Tello, S.C.A., The Plio - Pleistocene period in the Mantiqueira Mountain Range, SP/MG - Brazil: Apatite fission tracks (AFTA) and tectonic significance (1999) Actas II South American Symposium on Isotope Geology, pp. 306-309. , Cordoba, ArgentinaGuedes, S., Hackspacher, P.C., Hadler, N., Iunes, J.C., Machado Jr., P.J., Paulo, S.R., Ribeiro, L.F.B., Tello, S.C.A., Thermal history by fission track analysis of Serra Negra, Salitre, Catalāo II and Tapira carbonatite complexes, Brazil: Methodological study (1999) Book of Abstracts 1st Latin America Symposium on Nuclear Tracks and Its Applications in Physics, Health, Enviromental Studies and Industry, p. 127. , Universidad Simon Bolivar - Caracas - VenezuelaGuedes, S., Hackspacher, P.C., Hadler, N.J.C., Iunes, P.J., Paulo, S.R., Ribeiro, L.F.B., Tello, S.C., Constraints on the Evolution and thermal history of the Continental Platform of Southeast Brazil, São Paulo State, using Fission Track Analyses (AFTA) (2000) Revista Brasileira de Geociências, 30, pp. 107-109Hackspacher, P.C., Godoy, A.M., Vertical displacement during late-collisional scape tectonics (Brasiliano Orogeny) in Ribeira Belt, Sāo Paulo State, Brazil (1999) J. Afri. Earth Sci., 29, pp. 25-32Hackspacher, P.C., Dantas, E.L., Spoladore, A., Fetter, A.H., Oliveira, M.A.F., Evidence for neoproterozoic backarc basin development in the Central Ribeira Belt, Southeastern Brazil: New geochronological and geochemical constraints from the Sāo Roque - Açungui Groups (2000) Revista Brasileira de Geociências, 30, pp. 110-114Hackspacher, P.C., Fetter, A.H., Dantas, E.L., Hadler Neto, J.C., Ribeiro, L.F.B., Tello Sáenz, C.A., Tectonothermal events of southeastern Brazil: Implications for consolidations of the South American platform (2001) South-American Symposium on Isotope Geology, 3, p. 43. , Pucón/Chile. AnaisHackspacher, P.C., Juliani, C., Fetter, A.H., Dantas, E.L., The evolution of the Central Ribeira Belt, Brazil: Implications for the assembly of west Gondwana (2001) Gondwana Res., 4, pp. 626-627Hackspacher, P.C., Fetter, A.H., Ebert, H.D., Valdecir, A., Janasi, V.A., Dantas, E.L., Oliveira, M.A.F., Braga, I., Magmatismo cálcio-alcalino a ca. 660-640 Ma no Domínio Socorro: Registros de convergência pré-colisional na aglutinaçāo do Gondwana Ocidental (2002) Revista Geologia (Universidade de Sāo Paulo), , in pressHadler, N.J.C., Iunes, P.J., Paluo, S.R., Tello Sáenz, C.A., The study of apatite fission tracks annealing: Experimental measurements of density and lenght in basal and randomly oriented faces (2000) Book of Extend Abstracts of the 9th International Conference on Fission Track Dating and Termochronology, pp. 143-145. , Lorne, AustraliaJanasi, V.A., (1999) Petrogênese de Granitos Crustais Na Nappe de Empurrão Socorro-Guaxupé (SP-MG): Uma Contribuição Da Geoquímica Elemental E Isotópica, p. 304. , Livre Docência Thesis, Universidade de Sāo Paulo. Sāo Paulo-SPJuliani, C., Hackspacher, P.C., Dantas, E.L., Fetter, A.H., The Mesoproterozoic Volcano-Sedimentary Serra do Itaberaba Group of the Central Ribeira Belt, Sāo Paulo State, Brazil: Implications for the age of the overlying Sāo Roque Group (2000) Revista Brasileira de Geociências, 30, pp. 82-86King, L.C., A geomorfologia do Brasil Oriental (1957) Revista Brasileira de Geografia, 18, pp. 147-265Krogh, T.E., A low contamination method for hydrothermal decomposition of zircon and extraction of U and Pb for isotopic age determinations (1973) Geochim. Cosmochim. Acta, 37, pp. 485-494Laslett, G.M., Green, P.F., Duddy, I.R., Gleadow, A.J.W., Thermal annelaing of fission track in apatite 2: A quantitative analysis (1987) Chem. Geol. 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(Ed.), Oxford: Pergamon PressRaab, M.J., (2001) The Geomorphic Response of the Passive Continental Margin of Northern Namibia to Gondwana Break - Up and Global Scale Tectonics, p. 253. , Doctoral Thesis, Universität zu Göttingen, GöttingenRenne, P.R., Deckart, K., Ernesto, M., Féraud, G., Piccirillo, E.M., Age of the Ponta Grossa dike swarm (Brazil), and implications to Paraná flood volcanism (1996) Earth Planet Sci. Lett., 144, pp. 199-211Ribeiro, L.F.B., (2002) Morfotectônica Da Região Centro Leste Do Estado de São Paulo E Adjacências De Minas Gerais: Termocronologia E Paleotensões, p. 195. , Phd. Thesis Universidade Estadual Paulista, Rio Claro - SPSchobbenhaus, C., Campos, D.A., Derze, G.R., Asmus, H.E., (1981) Mapa Geológico Do Brasil E Da área Oceânica Adjacente Incluindo Depósitos Minerais. 1: 2 500 000, , Departamento Nacional de Produção Mineral, BrasíliaStacey, J.S., Kramers, J.D., Approximation of terrestrial lead isotope evolution by a two-stage model (1975) Earth Planet. 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Universidade de Campinas, Campinas- SPTello Sáenz, C.A., (1998) Estudo de Annealing de Traços de Fissão Em Apatitas, Tanto Em Seçōes Basais Quanto Em Seções Sem Orientaçāo Preferencial, Análise Dos Comprimentos Dos Traços De Fissāo, p. 111. , Doctoral Thesis, Universidade de Campinas, Campinas-SPTello Sáenz, C.A., Hackspacher, P.C., Hadler Neto, J.C., Iunes, P.J., Guedes, S., Ribeiro, L.F.B., Paulo, S.R., Recognition of Cretaceous, Paleocene and Neogene tectonic reactivation through apatite fission-track analysis in Precambriam areas of southeast Brazil: association with the opening of the south Atlantic Ocean (2002) J. South Amer. Earth Sci., 15, pp. 765-774Töpfner, C., Brasiliano-Granitoide in den Bundesstaaten Sāo Paulo und Minas Gerais- eine vergleichende Studie (1996) Münchner Geologische Hefte, A17, p. 258Tucker, G.E., Singerland, R.L., Erosional dynamics, flexural isostasy, and long - Lived escarpments: A numerical modeling study (1994) J. Geophys. 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Structural And Geochronological Studies Of The Médio Coreaú Domain, Ne Brazil: Constraints On Brasiliano/pan-african Tectonic Evolution In The Nw Part Of The Borborema Province
No full textRecent structural investigations and geochronological studies of rocks from the Médio Coreaú domain in the NW part of northeast Brazil's Borborema Province provide important constraints on the tectonic evolution of the region both preceeding and during the assembly of West Gondwana. Field observations of structural features and fabrics have revealed the presence of four distinct deformational phases in the MCD: D1, D2, D3 and D4. Only the early Paleoproterozoic gneisses record the D1 tectonic event and its preservation is cryptic owing to strong overprinting by the subsequent tectonic phases. The D2, D3 and D4 events affected younger supracrustal rocks and Neoproterzoic magmatic units, and U-Pb geochronological constraints show that all of these tectonic phases represent deformational events that occurred during Brasiliano collision between the West African craton and the NW part of the Borborema Province. The D2 phase, lasting between ca. 622 and 591 Ma, represents a frontal collision stage, which generated NW verging thrust-nappe systems, low-angle foliation, high-grade metamorphism and crustal anatexis. Transition to a strike-slip regime (D3) occurred at around 591 Ma when the region entered a phase of escape tectonics. During this time, the motion of crustal blocks towards NE and E was accommodated along numerous anastomosing shear zones. Syntectonic emplacement of granitoid plutons took place in transtensional domains of the shear zone system. The intrusion of late tectonic granitoids and rapid uplift and cooling of the orogen around 560 Ma as a result of D4 transpressional movements marked the end of the D3 transcurrent regime. These findings show that only the early Paleoproterozoic gneisses in the Médio Coreaú domain are polycyclic in nature. Rather than representing distinct orogenic events, the D2, D3 and D4 tectonic phases are a manifestation of progressive deformational events that developed in response to changes in the regional stress field during convergence and collision between the Borborema Province and its surrounding cratons.17Almeida, F.F.M., Hasui, Y., Brito Neves, B.B., Fuck, R.A., Brazilian structural provinces: An introduction (1981) Earth Science Reviews, 17, pp. 1-29Bouchez, J.L., Tubià, J.M., Mainprice, D., Déformation naturelle du quartz: Coexistence des systèmes de glissement de direction et à haute température (migmatites de la nappe d'Ojén, Espagne) (1985) Comptes Rendus De L'Académie Des Sciences De Paris, 301, pp. 841-846Brito Neves, B.B., dos Santos, E.J., Van Schmus, W.R., Tectonic history of the Borborema Province, northeastern Brazil (2000) Tectonic Evolution of South America. 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A Pc Compatible Brazilian Software For Obtaining Thermal Histories Using Apatite Fission Track Analysis
No full textIn this work a software developed in the Instituto de Física Gleb Wataghin, IFGW, UNICAMP, Campinas, SP, Brazil for obtaining thermal histories using apatite fission track analysis is presented. This software works in Microsoft-Windows environment. It will be freely disposable in the web site of the Departamento de Raios Cósmicos, IFGW, UNICAMP. Thermal histories obtained through this software are compared with those deduced using Monte Trax the software compatible with Apple Macintosh developed by Gallagher. © 2001 Elsevier Science Ltd. All rights reserved.341-6149154Almeida, F.F.M., Carneiro, C.D.R., Origem e evolução da Serra do Mar (1998) Rev. Bras. Geociênc., 28 (2), pp. 135-150Amaral, G., Born, H., Hadler, N.J.C., Iunes, P.J., Kawashita, K., Machado D.L., Jr., Oliveira, E.P., Tello, S.C.A., Fission track analysis of apatites from São Francisco Craton and Mesozoic alcaline-carbonatite complexes from central and southeastern Brazil (1997) J. S. Am. Earth Sci., 10, pp. 285-294Bigazzi, G., Length of fission tracks an age of muscovite samples (1967) Earth Planet. Sci. Lett., 3, pp. 313-318Bigazzi, G., Guedes, S., Hadler, N.J.C., Iunes, P.J., Paulo, S.R., Tello, S.C.A., Application of neutron dosimetry by natural uranium and thorium thin films in fission track dating (2000) Proceedings of the Nineth International Conference on Fission Track Dating and Thermocronology, pp. 33-35. , Lorne, Australia, February 6-11. Book of (extended) Abstracts, Geological Society of Australia Abstracts Series No. 58Duddy, I.R., Green, P.F., Laslett, G.M., Thermal annealing of fission tracks in apatite 3. Variable temperature behaviour (1988) Chem. Geol. (Isot. Geosci. Sect.), 73, pp. 25-38Gallagher, K., Evolving temperatures histories from apatite fission-track data (1995) Earth Planet. Sci. Lett., 136, pp. 421-435Gleadow, A.J.W., Fission track dating methods: What are the real alternatives? (1981) Nucl. Tracks, 5, pp. 3-7Gleadow, A.J.W., Duddy, I.R., Lovering, J.F., Fission track analysis: A new tool for the evaluation of thermal histories and hydrocarbon potencial (1983) Aust. Pet. Explor. Assoc. J., 23, pp. 93-102Green, P.F., Duddy, I.R., Gleadow, A.J.W., Tingate, P.R., Laslett, G.M., Thermal annealing of fission tracks in apatite, 1. A qualitative description (1986) Chem. Geol. (Isot. Geosci. Sect.), 59, pp. 237-253Green, P.F., The relationship between track shortening and fission track age reduction in apatite: Combined influence of inherent instability, annealing anisotropy, length bias and system calibration (1988) Earth Planet. Sci. Lett., 89, pp. 335-352Guedes, S., Hackspacher, P., Hadler, N.J.C., Iunes, P.J., Paulo, S.R., Ribeiro, L.F.B., Tello, S.C.A., Recognition of Cretaceous, Paleocene and Plio-Pleistocene activities through AFTA, in Precambriam areas of the Southeast Brazil: Association with the South Atlantic Ocean opening (2000) Proceedings of the Nineth International Conference on Fission Track Dating and Thermochronology, pp. 139-141. , Lorne, Australia, February 6-11. Book of (extended) Abstracts, Geological Society of Australia Abstracts Series No. 58Guedes, S., Hackspacher, P., Hadler, N.J.C., Iunes, P.J., Paulo, S.R., Ribeiro, L.F.B., Tello, S.C.A., (2000) Recognition of Cretaceous, Paleocene and Neogeno Activities, through AFTA, in Precambrian areas of the Southeast Brazil: association with the South Atlantic Ocean Opening, Tectonophysics, , submitted for publicationHadler, N.J.C., Iunes, P.J., Paulo, S.R., Tello, S.C.A., Obtainment of thermal histories for sets of geologically compatible localities by using apatite fission track analysis (1995) Rev. Bras. Fisica Aplicada Instrum., 10, pp. 1-10Hegarty, K.A., Weissel, J.K., Mutter, J.C., Subsidence history of Austria Southern margin: On basis models (1988) Am. Assoc. Pet. Geol. Bull., 72, pp. 615-633Iunes, P.J., (1999) Aplicação da Dosimetria de Neutrons através de Filmes Finos de Urânio Natural e Tório na Datação pelo Método dos Traços de Fissão, , Ph.D. Thesis, IFGW, UNICAMP, BrasilKantsler, A.J., Smith, G.C., Cook, A.C., Lateral and vertical rank variation: Implications for hydrocarbon exploration (1978) APEA J., 18 (1), pp. 143-156Laslett, G.M., Green, P.F., Duddy, I.R., Gleadow, A.J.W., Thermal annealing of fission tracks in apatite 2. A quantitative analysis (1987) Chem. Geol. (Isot. Geosci. Sect.), 65, pp. 1-13Lutz, T.M., Omar, G., An inverse method of modeling thermal histories from apatite fission-track data (1991) Earth Planet. Sci. Lett., 104, pp. 181-195Pereira, M.J., Feijó, F.J., Bacia de Santos (1994) Bol. Geociênc. Petrobrás, Brazil, 8 (1), pp. 219-234Storzer, D., Wagner, G.A., Correction of thermally lowered fission track ages of tektites (1969) Earth Planet. Sci. Lett., 5, pp. 463-468Tello, S.C.A., (1998) Estudo do Annealing de Traços de Fissão em Apatitas. Tanto em Seções Basais Como em Seções Sem Orientação Preferencial, a Partir do Comprimento e da Densidade de Traços de Fissão, , Ph.D. Thesis, IFGW, UNICAMP, BrasilWagner, G.A., Fission track dating of apatites (1968) Earth Planet. Sci. Lett., 5, pp. 463-46
Thermochronology Of The South American Platform In The State Of São Paulo, Brazil, Through Apatite Fission Tracks
No full textThe fission-track method (FTM) in apatite was applied to 45 samples collected in the Serra da Mantiqueira (Mantiqueira mountain range), the Serra do Mar (Mar mountain range), regions next to these mountain ranges and the coastal region between Ubatuba and Santos in the State of São Paulo, Brazil, to study the thermochronology of the South American Platform in southeast Brazil and its influence on Santos and Campos basins. The data presented in this work complement the previously presented data on the same region (Tello Saenz et al., 2003. J. S. Am. Earth Sci. 15, 765-774) with 31 new samples analyzed. The weighted mean of the corrected ages from high Mantiqueira (around 1000 m), (121±6)Ma, coincides with the South Atlantic opening. The fact that its thermal history starts at a relatively low temperature (∼80°C) suggests that the age of ∼120Ma would be the formation age of Serra da Mantiqueira due to a rapid pulse, in which tracks had no time to be retained at the closure temperature, that is ∼120°C. The Serra do Mar presents a more complicated thermal history, with several reactivations indicated by the changes in the slope of its cooling curve. The thermal histories obtained in the regions next to these mountain ranges are compatible with the results mentioned above. The Santos Basin has unconformities that agree with changes in the slope thermal histories of the studied region. © 2005 Elsevier Ltd. All rights reserved.396635640Almeida, F.F.M., Carneiro, C.D.R., Origem e evolução da Serra do Mar (1998) Rev. Bras. Geociência, 28, pp. 135-150Amaral, G., Born, H., Hadler Neto, J.C., Iunes, P.J., Kawashita, K., Machado Jr., D.L., Oliveira, E.P., Tello Saenz, C.A., Fission track analysis of apatites from São Francisco craton and mesozoic alcaline-carbonatite complexes from central and southeastern Brazil (1997) J. S. Am. Earth Sci., 10, pp. 285-294Fleischer, R.L., Hart, H.R., Fission track dating: Techniques and problems (1972) Proceedings of Burg Wartenstein Conference on Calibration of Hominoid Evolution, pp. 135-170. , W.W. Bishop D.A. Miller S. Colle Scottish Academic Press EdinburghGuedes, S., Hackspacher, P., Hadler Neto, J.C., Iunes, P.J., Paulo, S.R., Ribeiro, L.F.B., Tello Saenz, C.A., Constraints on the evolution and thermal history of the continental platform of southeast Brazil, São Paulo state, using Fission Track Analyses (AFTA) (2000) Rev. Bras. Geociências, 30, pp. 107-109Guedes, S., Hadler Neto, J.C., Iunes, P.J., Paulo, S.R., Zuñiga, A., The spontaneous fission decay constant of 238U using SSNTD (2000) J. Radioanal. Nucl. Chem., 245, pp. 441-442Guedes, S.O., Hadler Neto, J.C., Iunes, P.J., Zuñiga, A.G., Tello Saenz, C.A., Paulo, S.R., The use of the U(n,f) reaction dosimetry in the determination of the λf value through fission-track techniques (2003) Nucl. Instrum. Meth. A, 496, pp. 215-221Guedes, S., Hadler Neto, J.C., Sarkis, J.E.S., Oliveira, K.M.G., Kakazu, M.H., Iunes, P.J., Saiki, M., Paulo, S.R., Spontaneous-fission decay constant of 238U measured by nuclear techniques without neutron irradiation (2003) J. Radioanal. Nucl. Chem., 258, pp. 117-122Hadler Neto, J.C., Paulo, S.R., Iunes, P.J., Tello Saenz, C.A., Balestrieri, M.L., Bigazzi, G., Curvo, E.A.C., Hackspacher, P., A PC compatible Brazilian software for obtaining thermal histories using apatite fission track analysis (2001) Radiat. Meas., 34, pp. 149-154Hadler Neto, J.C., Bigazzi, G., Guedes, S., Iunes, P.J., Oddone, M., Tello Saenz, C.A., Paulo, S.R., Spontaneous U-238 fission half-life measurements based on fission track techniques (2003) J. Radioanal. Nucl. Chem., 256, pp. 155-157Holden, N.E., Hoffman, D.C., Spontaneous fission half-lives ground-state nuclides (Technical report) (2000) Pure Appl. Chem., 72, pp. 1525-1562Iunes, P.J., Hadler Neto, J.C., Bigazzi, G., Tello Saenz, C.A., Guedes, S.O., Paulo, S.R., Durango apatite fission-track dating using length-based age corrections and neutron fluence measurements by thorium thin films and natural U-doped glasses calibrated through natural uranium thin films (2002) Chem. Geol., 187, pp. 201-211Laslett, G.M., Green, P.F., Duddy, I.R., Gleadow, J.W.A., Thermal annealing of fission tracks in apatite 2. The quantitative analysis (1987) Chem. Geol., 65, pp. 1-13Lutz, T.M., Omar, G., An inverse method of modeling thermal histories from apatite fission-track dates (1991) Earth Planet. Sci. Lett., 104, pp. 181-195Pereira, M.J., Feijó, F.J., Bacia de Santos (1994) Bol. Geociências Petrobrás, 8, pp. 219-234Tello Saenz, C.A., Hackspacher, P., Hadler Neto, J.C., Iunes, P.J., Guedes, S.O., Paulo, S.R., Ribeiro, L.F.B., Recognition of Cretaceus, Paleocene and Neogene Tectonic reactivation, through apatite fission-track analysis, in Precambrian areas of the Southeast Brazil: Association with the South Atlantic Ocean opening (2003) J. S. Am. Earth Sci., 15, pp. 765-774Tello Saenz, C.A., Hadler Neto, J.C., Iunes, P.J., Guedes, S., Paulo, S.R., Annealing experiments on induced fission tracks in apatite: I. Measurements of horizontal-confined-track lengths and track densities in basal sections and randomly oriented grains (2004) Am. Mineral., , submitte
Neoproterozoic Tectonic And Magmatic Episodes In The Nw Sector Of Borborema Province, Ne Brazil, During Assembly Of Western Gondwana
No full textThe Médio Coreaú domain of NE Brazil is located along the northwest margin of Borborema Province, the western branch of a Brasiliano/Pan-African collisional belt that formed during the assembly of Western Gondwana. The early Paleoproterozoic basement of the Médio Coreaú domain is composed of migmatitic gneisses and juvenile granulites, overlain by late Paleoproterozoic and Neoproterozoic rocks intruded by syn- to post-tectonic Brasiliano granitoids. According to integrated structural and geochronological data (U-Pb zircon and monazite ages), the Neoproterozoic tectonic evolution of the Médio Coreaú is characterized by low-angle thrusting and transcurrent deformation. U-Pb geochronological data from plutons intruded during this compressional regime indicate the collisional evolution began at approximately 622 Ma and continued until about 591 Ma. The continuation of convergence until approximately 560 Ma resulted in the formation of NE-SW and E-W shear zones within the Borborema Province and adjoining West African provinces. The final stage of the ductile tectonism was characterized by uplift and high-angle fault generation between approximately 560 and 545 Ma. The last tectonic event was an extensional phase, resulting in the formation of the Jaibaras graben and intrusion of post-orogenic granites at around 532 Ma. © 2007 Elsevier Ltd. All rights reserved.253271284Almeida, F.F.M., Hasui, Y., Brito Neves, B.B., Fuck, R.A., Brazilian structural provinces: an introduction (1981) Earth Science Reviews, 17, pp. 1-29Boher, M., Abouchami, W., Michard, A., Albarede, F., Arndt, N.T., Crustal Growth in West Africa at 2.1 Ga (1992) Journal Geophysics Research, 97, pp. 345-369Brito Neves, B.B., 1975. Regionalização geotectônica do pré-Cambriano nordestino. Thesis, Universidade de São Paulo, p. 198Brito Neves, B.B., 1983. O mapa geológico do nordeste oriental do Brasil, Escala 1;1.000.000. Thesis, Livre docência, Universidade de São Paulo, p. 177Brito Neves, B.B., Cordani, U.G., Tectonic evolution of South America during the Late Proterozoic (1991) Precambrian Research, 53, pp. 23-40Brito Neves, B.B., dos Santos, E.J., Van Schmus, W.R., 2000. Tectonic history of the Borborema Province, northeastern Brazil. In: U. Cordani, E.J. Milani, A. Thomaz Filho, Campos, D.A. (Eds.), Tectonic Evolution of South America. Proceedings of the Thirty-first International Geological Congress, Rio de Janeiro, Brazil, pp. 151-182Brito Neves, B.B., Van Schmus, W.R., Fetter, A.H., North-western Africa-North-eastern Brazil. Major tectonic links and correlation problems (2002) Journal of African Earth Sciences, 34, pp. 275-278Brown, M., Solar, G.S., Granite ascent and emplacement during contractional deformation in convergent orogens (1998) Journal of Structural Geology, 20, pp. 1365-1393Caby, R., 1989. Precambrian terrane of Benin-Nigeria and northeast Brazil and Proterozoic Atlantic fit barks. Geological Soc. of America, Special paper, 230, pp. 145-158Caby, R., Arthaud, M.H., Major Precambrian nappes of the Brazilian Belts, Ceará, Northeast Brazil (1986) Geology, 14, pp. 871-874Caby, R., Arthaud, M.H., Archanjo, C.J., Lithostratigraphy and petrostructural characterization of supracrustal units in Brasiliano Belt of Northeast Brazil: geodynamic implications (1995) Journal of South American Earth Sciences, 8, pp. 235-246Caby, R., Sial, A.N., Arthaud, M.H., Vauchez, A., Crustal evolution and the Brasiliano orogeny northeast Brazil (1991) The West African orogens and circum-Atlantic correlative, pp. 373-397. , Dallmeyer R.D., and Lécorché J.P. (Eds), Springer-VerlagCastaing, C., Feybesse, J.L., Thiéblemont, C., Triboulet, C., Chevremont, P., Paleogeographical reconstructions of the Pan-Africano/Brasiliano Orogen: closure of an oceanic domain or intracontinental convergence between major blocks? (1994) Precambrian Research, 69, pp. 327-344Castro, N.A., Basei, M.A.S., Sato, K., 2003. Nd data from Central Ceará Domain: Archean relics, Paleoproterozoic record and Neoproterozoic crustal reworking. In: Proceedings IV Symposium on South American Isotope Geology, Brazil, pp. 160-163Cavalcanti, J., Ferreira, C.A., 1983. Mapa Geológico do Estado do Ceará. Scale 1:500,000, MME/CPRM - BrasíliaCosta, M.J., França, J.B., Bacchiegga, I.F., Habekost, C.R. Cruz, W.B. da, 1973. Geologia da Bacia JaibarasCeará, Piauí e Maranhão. Projeto Jaibaras. DNPM/CPRM. Relatório final (5 vols.)Dantas, E.L., Van Schmus, W.R., Hackspacher, P.C., Fetter, A.H., Brito Neves, B.B., Cordani, U., Nutman, A.P., Williams, I.S., The 3.4-3.5 Ga São José do Campestre massif, NE Brazil: remnants of the oldest crust in South America (2004) Precambrian Research, 130, pp. 113-137Djouadi, M.T., Gleizes, G., Ferré, E., Bouchez, J.L., Caby, R., Lesquer, A., Oblique magmatic structures of two epizonal granite plutons, Hoggar, Algeria: late-orogenic emplacement in a transcurrent orogen (1997) Tectonophysics, 279, pp. 351-374Duguet, M., Faure, M., Granitoid emplacement during a thrusting event: structural analysis, microstructure and quartz c-axis patterns. An example from Hercynian plutons in the French Massif Central (2004) Journal of Structural Geology, 26 (5), pp. 927-945Ferré, E.C., Caby, R., Peucat, J.J., Capdevila, R., Monié, P., Pan-African, post-collisional, ferro-potassic granite and quartz-monzonite plutons of Eastern Nigeria (1998) Lithos, 45 (1-4), pp. 255-279Ferreira, V.P., Sial, A.N., Jardim de Sá, E.F., Geochemical and isotopic signatures of Proterozoic granitoids in terranes of the Borborema structural province, northeastern Brazil (1998) Journal of South American Earth Sciences, 11 (5), pp. 439-455Fetter, A.H., 1999. U-Pb and Sm-Nd Geochronological constraints on the crustal framework and geological history of Ceará State, NW Borborema Province, NE Brazil: implications for the assembly of Gondwana. University of Kansas, Ph.D. thesis, 164 ppFetter, A.H., dos Santos, T.J.S., Van Schmus, W.R., Hackspacher, P.C., Brito Neves, B.B., Arthaud, M.H., Nogueira Neto, J.A., Wernick, E., Evidence for Neoproterozoic continental arc magmatism in the Santa Quitéria batholith of Ceará State, NW Borborema Province, NE Brazil: implications for assembly of West Gondwana (2003) Gondwana Research, 6, pp. 265-273Fetter, A.H., Van Schmus, W.R., dos Santos, T.J.S., Arthaud, M.H., Nogueira Neto, J.A., 1997. Geologic history and framework of Ceará State: northwest Borborema Province, NE Brazil. South American Symposium on Isotope geology, Brazil, Extended Abstracts, pp. 112-114Fetter, A.H., Van Schmus, W.R., dos Santos, T.J.S., Arthaud, M., Nogueira Neto, J.A., 2000. U-Pb and Sm-Nd geochronological constraints on the crustal evolution and basement architecture of Ceará State, NW Borborema Province, NE Brazil: implications for the existence of the Paleoproterozoic supercontinent "Atlantica". Revista Brasileira de Geociências, 30, pp. 102-106Fowler Jr., T.K., Paterson, S.R., Timing and nature magmatic fabrics from structural relations around stoped blocks (1997) Journal Structural Geology, 19, pp. 209-224Gaudette, H.E., Abreu, F.d.A.M.d., Lafon, J.M., Gorayeb, P.S.d.S., Evolução transamazônica do cinturão de cisalhamento noroeste do Ceará: novas evidências geocronológicas (1993) Ann. Simp. Geologia do Nordeste, 13, pp. 317-319Gorayeb, P.S.S., Abreu, F.A.M., Moura, C.A.V., Geração de corpos graníticos batolíticos sin-transamazônicos na Província Borborema: o exemplo do granitóide Chaval (1995) Simpósio de Geologia do Nordeste, Recife, 14 (2), pp. 414-417Guimarães, I.P., Almeida, C.N., Da Silva Filho, A.F., Araújo, J.M.M., Granitoids marking the end of the Brasiliano (Pan-African orogeny within the Central Tectonic Domain of the Borborema Province (2000) Revista Brasileira de Geociências, 30 (1), pp. 177-181Heilbron, M., Machado, N., Timing of terrane accretion in the Neoproterozoic - Eopaleozoic Ribeira orogen (SE Brazil) (2003) Precambrian Research, 125, pp. 87-112Jardim de Sá, E.F., 1994. A faixa Seridó (Província Borborema) e o seu significado geodinâmico na cadeia Brasiliana/Pan-Africana. Inst. De Geociência, Universidade de Brasília, Ph.D. thesis, 803pKrogh, T.E., A low contamination method for hydrothermal decomposition of zircon and extraction of U and Pb for isotopic age determinations (1973) Geochimica et Cosmochimica Acta, 37, pp. 485-494Krogh, T.E., Improved accuracy of U-Pb zircon ages by the creation of more concordant systems using an air abrasion technique (1982) Geochimica et Cosmochimica Acta, 46, pp. 637-649Ludwig, K.R., 1993. ISOPLOT - A plotting and regression program for radiogenic-isotope data: version 2.70. U.S. Geological Survey Open-File Report 91-445, 42pMacedo, M.H.P., Sá, J.M., Kawashita, K., A idade da faixa Orós: resultados preliminares (1988) Revista Brasileira de Geociências, 18, pp. 1-24Monié, P., Caby, R., Arthaud, M.H., The Neoproterozoic Brasiliano Orogeny in Northeast Brazil: 40Ar/39Ar and petrostructural data from Ceará (1997) Precambrian Research, 81, pp. 241-264Nascimento, D.A., Gava, A., Pires, J.L., Teixeira, W., 1981. Geologia da folha sa 24 - Fortaleza. In: Projeto Radam Brasil. DNPM, Rio de Janeiro. vol. 21, 23-212Neves, S.P., Mariano, G., Assessing the tectonic significance of a large-scale transcurrent shear zone system: the Pernambuco lineament, northeastern Brazil (1999) Journal of Structural Geology, 21 (10), pp. 1369-1383Neves, S.P., Vauchez, A., Feraud, G., Tectono-thermal evolution, magma emplacement, and shear zone development in the Caruaru area (Borborema Province, NE Brazil) (2000) Precambrian Research, 99 (1-2), pp. 1-32NogueiraNeto, J.A., Marques Jr., F., Néri, T.F.O., Pedreira, L.H.S.T., 1989. Contribuição à geologia do município de Chaval (CE). Atas do XIII Simpósio de Geologia do NE. Fortaleza, SBG, 11, 27-28Oliveira, D.C., Stratigraphic interplays between igneous and sedimentary events in the Early Paleozoic Jaibaras trough (Northeast Brazil) (2000) Revista Brasileira de Geociências, 30 (3), pp. 423-427Oliveira, D.C., Mohriak, W.U., Jaibaras trough: an important element in the early tectonic evolution of the Parnaíba interior sag basin, Northern Brazil) (2003) Marine and petroleum geology, 20, pp. 351-383Paquette, J.L., Caby, R., Djouadi, M.T., Bouchez, J.L., U-Pb dating of the end of the Pan-African orogeny in the Tuareg shield: the post-collisional syn-shear Tioueine pluton (Western Hoggar, Algeria) (1998) Lithos, 45 (1-4), pp. 245-253Parrish, R.R., U-Pb of monazite and its application to geological problems (1990) Canada Journal of Earth Science, 27, pp. 1431-1450Parrish, R.R., An improved micro-capsule for zircon dissolution in U-Pb geochronology (1987) Isotope Geoscience, 66, pp. 99-102Passchier, C.W., Trouw, R.A.J., (1996) Microtectonics, , Springer Verlag pp. 325Paterson, S.R., Vernon, R.H., Tobisch, O.T., A review of criteria for the identification of magmatic and tectonic foliations in granitoids (1989) Journal of Structural Geology, 11 (3), pp. 349-363Santos, T.J.S., 1993. Aspectos geológicos de uma área a sudoeste de Granja, NW do Ceará. Dissertação de mestrado, Instituto de Geociências e Ciências Exatas IGCE/UNESP-Rio Claro, São Paulo, p. 159Santos, T.J.S., 1999. Evolução Tectônica e Geocronológica do Extremo Noroeste da Província Borborema. PhD unpublished thesis, Instituto de Geociências e Ciências Exatas IGCE/UNESP-Rio Claro, São Paulo, 186pSantos, T.J.S., Hackspacher, P.C., 1991. Geologia do Grupo Martinópole, NW do Ceará. Anais do XXX Congresso Brasileiro de Geologia, São PauloSantos, T.J.S., Nogueira Neto, J.A., Fetter, A.H., Hackspacher, P.C., 2001. Petrografia e Litogeoquímica das Rochas do Embasamento Cristalino da Região de Granja - CE. Revista de Geologia (UFC) 14, pp. 33-48Santos, T.J.S., Santos, A.A., Dantas, E.L., Fuck, R.A., Parente, C.V., 2003. Nd Isotopes and the provenance of metasediments of the Itataia Group, northwest Borborema Province, NE Brazil. Proceedings of the IV Symposium on South American Isotope Geology, Brazil, pp. 286-289Santos, T.J.S., Souza, G.M., Queiroz, H.B., Nogueira Neto, J.A., Parente, C.V., 2002. Tafrogênese estateriana no embasamento paleoproterozóico do NW da Província Borborema: uma abordagem petrográfica, geoquímica e geocronológica. XLI Congresso Brasileiro de Geologia, João Pessoa, pp. 337-337Sial, A.N., Long, L.E., Figueiredo, M.H., Rare Earth element geochemistry of the Meruoca and Mucambo plutons, Ceará, Northeast Brazil (1981) Chemical Geology, 31, pp. 271-283Stacey, J.S., Kramers, J.D., Approximation of terrestrial lead isotope evolution by a two-stage model (1975) Earth and Planetary Science Letters, 26, pp. 207-221Steiger, R.H., Jäger, E., Subcommision on Geochronology: convention on the use of decay constants in geo- and cosmochronology (1977) Earth and Planetary Science Letters, 36, pp. 359-362Torquato, J.R., Cordani, V.G., Brazil-Africa geological links (1981) Earth Science Reviews, 17, pp. 155-176Trompette, R., (1994) Geology of western Gondwana Pan-African/Brasiliano aggregation of South America and Africa, , Brookfield: Balkema, Rotterdam 350pVan Schmus, W.R., Brito Neves, B.B., Hackspacher, P., Babinski, M., U/Pb and Sm/Nd geochronolgic studies of eastern Borborema Province, northeastern Brazil: initial conclusions (1995) Journal South America Earth Sciences, 8, pp. 267-288Van Schmus, W.R., Brito Neves, B.B., Hackspacher, P., Fetter, A.H., Dantas, E.L., Babinski, M., The Seridó Group of NE Brazil, a late Neoproterozoic pre- to syn-collisional basin in West Gondwana: insights from SHRIMP U-Pb detrital zircon ages and Sm-Nd crustal residence (TDM) ages (2003) Precambrian Research, 127, pp. 287-32
Vertical displacement during late-collisional escape tectonics (Brasiliano Orogeny) in the Ribeira Belt, São Paulo State, Brazil
No full textDuring the Brasiliano-Pan-African Orogeny, West Gondwana formed by collisional processes around the Sao Francisco-Congo Craton. The Ribeira belt, in southeastern Brazil, resulted from northwestward collision (650-600 Ma), followed by large-scale northeast-southwest dextral strike-slip shear movements related to late-collisional escape tectonics (ca 600 Ma).In São Paulo State, three groups, also interpreted as terranes, are recognised in the Ribeira Belt, the Embu, Itapira and Sao Rogue Groups. The Embu and Itapira Groups are formed of sillimanite-gneisses, schists and migmatites intruded by Neoproterozoic calc-alkaline granitoids, all thrusted northwestward. The Sao Rogue Group is composed of metasediments and metavolcanics in greenschist-facies. Its deformation indicates a transpressional regime associated with tectonic escape. Sub-alkaline granites were emplaced in shallow levels during this regime. Microstructural studies along the Itu, Moreiras and Taxaquara Shear Zones demonstrate the coexistence of horizontal and Vertical displacement components during the transpressional regime. The vertical component is regarded as responsible for the lateral juxtaposition of different crustal levels. (C) 1999 Elsevier B.V. Limited. All rights reserved.Univ Estadual Paulista, IGCE, Dept Petrol & Met, BR-13506900 Rio Claro, SP, BrazilUniv Estadual Paulista, IGCE, Dept Petrol & Met, BR-13506900 Rio Claro, SP, Brazi
U Pb and Sm Nd geochronologic studies of the eastern Borborema Province, Northeastern Brazil: initial conclusions
No full textThe Borborema Province of NE Brasil comprises the central part of a wide Pan-African-Brasiliano orogenetic belt that formed as a consequence of late Neoproterozoic convergence and collision of the São Luis-West Africa craton and the São Francisco-Congo-Kasai cratons. New Sm Nd and U Pb results from the eastern part of this province help to define the basic internal architecture and pre-collisional history of this province, with particular emphasis on delineating older cratonic terranes, their fragmentation during the Mesoproterozoic, and their assembly into West Gondwana during the Pan African-Brasiliano orogeny at ca. 600 Ma. The region can be divided into three major geotectonic domains: a) Rio Piranhas-Caldas Brandão massif, with overlying Paleoproterozoic to Neoproterozoic supracrustal rocks, north of the Patos Lineament; b) the Archean to Paleoproterozoic São Francisco craton (SFC) to the south; and c) a complex domain of Paleoproterozoic to Archean basement blocks with several intervening Mesoproterozoic to Neoproterozoic fold belts in the center (south of Patos Lineament and north of SFC). The northern and central domains comprise the Borborema Province. Archean basement gneiss and Transamazonian granulite of northern SFC are exposed in the southern part of the central domain, underlying southern parts of the Sergipano fold belt. Basement in the Rio Piranhas massif appears to consist mostly of Transamazonian (2.1 to 2.2 Ga) gneissic rocks; Nd model ages (TDM) of ca. 2.6 Ga for 2.15 Ga gneisses indicate a substantial Archean component in the protoliths to these gneisses. The Caldas Brandão massif to the east yields both Transamazonian and Archean U Pb zircon and Nd (TDM) ages, indicating a complex architecture. Metasedimentary rocks of the Jucurutu Formation yield detrital zircons with original crystallization ages as young as 1.8 Ga, indicating that these rocks may be late Paleoproterozoic and correlate with other ca. 1.8 Ga cratonic supracrustal rocks in Brazil such as the Roraima Group and Espinhaço Group. Most metavolcanic and pre-Brasiliano granitic units of the Sergipano (SDS), Pajeú-Paraíba (SPP), Riacho Pontal (SRP), and Piancó-Alto Brígida (SPAB) fold belts in the central domain formed ~ 1.0 ± 0.1 Ga, based on U Pb ages of zircons. Nd model ages (TDM) for these same rocks, as well as Brasiliano granites intruded into them and large parts of the Pernambuco-Alagoas massif, are commonly 1.3-1.7 Ga, indicating that rocks of the fold belts were not wholly derived from either older (> 2.1 Ga) or juvenile (ca. 1.0 Ga) crust, but include mixtures of both components. A simple interpretation of Brasiliano granite genesis and the Nd data implies that there is no Transamazonian or Archean basement underlying large parts of these fold belts or of the Pernambuco-Alagoas massif. An exception is a belt of syenitic Brasiliano plutons (Syenitoid Line) and host gneisses between SPAB and SPP that clearly has a Transamazonian (or older) source. In addition, there are several smaller blocks of Archean to Transamazonian gneiss that can be defined within and among these fold belts. These blocks do not appear to constitute a continuous basement complex, but appear to be isolated older crustal fragments. Our data support a model in which ca. 1.0 Ga rifting was an important tectonic and crust-forming event along the northern edge of the São Francisco craton. Our data also show that significant parts of the Borborema Province are not remobilized Transamazonian to Archean crust, but that Mesoproterozoic crust is a major feature of the Province. There are several small remnants of older crust within the area dominated by Mesoproterozoic crust, suggesting that the rifting event created several small continental fragments that were later incorporated into the Brasiliano collisional orogen. We cannot at present determine if the Rio Piranhas-Caldas Brandão massifs and the older crustal blocks of the central domain were originally part of the São Francisco craton or whether some (or all) of them came from more exotic parts of the Proterozoic Earth. Finally, our data have not yet revealed any juvenile terranes of either Transamazonian or Brasiliano age. © 1995.Department of Geology University of Kansas, Lawrence, KS 66045Instituto de Geociências Universidade de São Paulo, São Paulo, SPInstituto de Geociências e Ciências Exatas Universidade Estadual Paulista, Rio Claro, SPInstituto de Geociências e Ciências Exatas Universidade Estadual Paulista, Rio Claro, S
Evolution of the Central Ribeira Belt, Brazil: Implications for the Assembly of West Gondwana
No full textInst. Geociencias Cie. Exatas-UNESP, P.O. Box 178, 13506-900 Rio Claro-SPInstituto de Geociências - USP, P.O. Box 11348, 05508-900 São Paulo- SPInstituto de Geociências-UnB, 70910-900 Brasília- DFInst. Geociencias Cie. Exatas-UNESP, P.O. Box 178, 13506-900 Rio Claro-S
Petrotrama de quartzo e feldspato ao longo da Zona de Cisalhamento de Jundiuvira, Cabreuva (SP)
No full textFluid inclusions, petrofabric and microstructures studies of mylonites and cataclasites were used to establish the Itu-Jundiuvira Shear Zone (IJSZ) tectonic and metamorphic evolution. The quartz fabric indicates that prism {1000} slip was important during the deformation. This studies have showed that IJSZ changed from deeper crustal levels (12-15km) and ductile conditions to upper levels of about 4 to 6km and brittle strain conditions. -English summar
Feldspar and quartz petrofabric in the Jundiuvira Shear Zone, Cabreuva, SP
No full textFluid inclusions, petrofabric and microstructures studies of mylonites and cataclasites were used to establish the Itu-Jundiuvira Shear Zone (IJSZ) tectonic and metamorphic evolution. The quartz fabric indicates that prism {1000} slip was important during the deformation. This studies have showed that IJSZ changed from deeper crustal levels (12-15km) and ductile conditions to upper levels of about 4 to 6km and brittle strain conditions. -English summar
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