1,721,165 research outputs found
Correlation of inorganic and organic thermal indicators in the eastern Sicily fold-and-thrust belt
No full textCorrelation of organic and inorganic parameters for thermal maturity reconstructions in the Apennine-Maghrebian fold-and-thrust belt (Italy)
No full textDetrital and diagenetic illite identified from crystallite thickness measurements - A tool for paleo-temperature
No full textStudio della mineralogia delle argille per la ricostruzione dei carichi tettonico/sedimentari: esempi dalle Unità Lagonegresi e Liguridi della Lucania sud-occidentale (Appennino Meridionale)
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Burial history of the southern portion of the Tuscan Nappe (Northern Apennines) constrained by means of organic and inorganic paleo‐thermal indicators: implications for the orogenic wedge evolution
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CLAY MINERAL ASSEMBLAGES AND VITRINITE REFLECTANCE IN THE LAGA BASIN (CENTRAL APENNINES, ITALY): WHAT DO THEY RECORD?
No full textMessinian Laga Basin in the Central Apennines developed at the footwall of the Sibillini Mts. and the Gran Sasso Massif. Data are from stratigraphic units forming the main siliciclastic basin fill up to Middle Messinian gypsum-arenites and its pre-orogenic substratum. Specifically, the largest Rom% values and percentages of illite layers in illite-smectic (I-S) are found in the basin depocenter and at the footwall of the main carbonate thrust sheets. Smaller Rom% values, and percentage of illite layers in I-S characterize less subsided sectors surrounding the depocenter. The X-ray diffraction data were treated using decomposition methods and the peaks identified were rationalized in terms of discrete and/or mixed-layer phases. Complex clay mineral assemblages were found in the Laga Fm. including three sub-populations of illitic material corresponding to authigenic and detrital components, I-S mixed layers record the maximum paleotemperature the Laga Fm. experienced, which is directly related to its burial history. Kübler index (KI) data, however, suggest higher temperatures related to detrital K-micas inherited from the uplift of the Alpine-Apennines chain. A tentative calculation of paleotemperatures from selected data of organic and inorganic parameters is also proposed and compared with recent sedimentological, stratigraphic and structural data. We conclude that the Laga Basin fill never experienced temperatures of >100-110°C, generally due to variable sedimentary loading, whereas localized anomalous heating is due to the effect of the tectonic emplacement and subsequent local erosion of the Sibillini and Gran Sasso thrust sheets
Structural evolution of the Apenninic-Maghrebian orogen in Eastern Sicily: thermal and thermochronological constraints
No full textTemperature-dependent clay mineral assemblages and vitrinite reflectance data have been used to investigate levels of diagenesis from the Sicilian-Maghrebian fold-and-thrust belt in Eastern Sicily at the footwall of the Kabilian-Peloritan-Calabrian Arc. Data are from units sampled between the Nebrodi Mountains to the north and Mt. Judica to the south. The integration of organic and inorganic thermal indicators allowed us to distinguish portions of the accretionary wedge with different thermal maturity and thermo-chronological evolution and to define the maximum temperature that thrust-top, foredeep basin deposits and accreted passive margin units experienced. VRo% values between 0.60-0.96% and illite content in mixed-layer I-S (60-85%) are found in trench-involved and in accreted passive margin units. Lower VRo% values (0.20-0.50%), and percentage of illite layers in I-S (30-60%) are found in thrust-top and foredeep basin deposits and in units back-thrust toward the hinterland and mainly gravity-mobilized toward the Hyblean Plateau. Apatite fission-track data from the trench-involved deep structural units were partially to totally annealed during wedge accretion and indicate that subsequent exhumation have occurred mainly in Burdigalian times. Shallow structural units of the wedge have been removed by tectonics and erosion
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