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Extrapolation Of Zircon Fission-track Annealing Models
No full textOne of the purposes of this study is to give further constraints on the temperature range of the zircon partial annealing zone over a geological time scale using data from borehole zircon samples, which have experienced stable temperatures for ∼1 Ma. In this way, the extrapolation problem is explicitly addressed by fitting the zircon annealing models with geological timescale data. Several empirical model formulations have been proposed to perform these calibrations and have been compared in this work. The basic form proposed for annealing models is the Arrhenius-type model. There are other annealing models, that are based on the same general formulation. These empirical model equations have been preferred due to the great number of phenomena from track formation to chemical etching that are not well understood. However, there are two other models, which try to establish a direct correlation between their parameters and the related phenomena. To compare the response of the different annealing models, thermal indexes, such as closure temperature, total annealing temperature and the partial annealing zone, have been calculated and compared with field evidence. After comparing the different models, it was concluded that the fanning curvilinear models yield the best agreement between predicted index temperatures and field evidence. © 2012 Elsevier Ltd. All rights reserved.50192196Carlson, W.D., Mechanisms and kinetics of apatite fission-track annealing (1990) Am. Mineral, 75, pp. 1120-1139Crowley, K.D., Cameron, M., Shaefer, R.L., Experimental studies of annealing of etched fission tracks in fluor apatite (1991) Geochim. Cosmochim. Acta, 55, pp. 1449-1465Dodson, M.H., Closure temperature in cool geochronological and petrological systems (1973) Contrib. Mineral Petrol., 40, pp. 259-274Duddy, I.R., Green, P.F., Laslett, G.M., Thermal annealing of fission tracks in apatite. 3. Variable temperature behaviour (1988) Chem. Geol., 73, pp. 25-38Guedes, S., Hadler, J.C., Iunes, P.J., Tello, C.A., Kinetic model for the relationship between confined fission-track length shortening and fission track age reduction in minerals (2004) Nucl. Instrum. Methods B, 217, pp. 627-636Guedes, S., Hadler, J.C., Iunes, P.J., Oliveira, K.M.G., Moreira, P.A.F.P., Tello, C.A., Kinetic model for the annealing of fission tracks in zircon (2005) Radiat. Meas., 40, pp. 517-521Guedes, S., Hadler, J.C., Oliveira, K.M.G., Moreira, P.A.F.P., Iunes, P.J., Tello, C.A., Kinetic model for the annealing of fission tracks in minerals and its application to apatite (2006) Radiat. Meas., 41, pp. 392-398Guedes, S., Moreira, P.A.F.P., Devanathan, R., Weber, W.J., Hadler, J.C., Improved Fission-track Annealing Model Based on Reevaluation of Annealing Data, , submittedHasebe, N., Mori, S., Tagami, T., Matsui, R., Geological partial annealing zone of zircon fission-track system: Additional constraint from the deep drilling MITI-Nischikubi and MITIMishima (2003) Chem. Geol., 199, pp. 45-52Laslett, G.M., Green, P.F., Duddy, I.R., Gleadow, J.W.A., Thermal annealing of fission tracks in apatite 2. A quantitative analysis (1987) Chem. Geol. Isot. Geosci. Sect., 65, pp. 1-13Laslett, G.M., Galbraith, R.F., Statistical modeling of thermal annealing of fission tracks in apatite (1996) Geochim. Cosmochim. Acta, 60, pp. 5117-5131Murakami, M., Yamada, R., Tagami, T., Short-term annealing characteristics of spontaneous fission tracks in zircon: A qualitative description (2006) Chem. Geol. Isot. Geosc. Sect., 227, pp. 214-222Palenik, C.S., Nasdala, L., Ewing, R.C., Radiation damage in zircon (2003) Am. Mineral, 88, pp. 770-781Rahn, M.K., Brandon, M.T., Batt, G.E., Garver, J.I., A zero-damage model for fission-track annealing in zircon (2004) Am. Mineral, 89, pp. 473-484Tagami, T., Ito, H., Nishimura, S., Thermal annealing characteristics of fission tracks in zircon (1990) Chem. Geol. Isot. Geosci. Sect., 80, pp. 159-169Tagami, T., Galbraith, R.F., Yamada, R., Laslett, G.M., (1998) Revised Annealing Kinetics of Fission Tracks in Zircon and Geological Implications. Advances in Fission-Track Geochronology, , Kluwer Academic Publishing The Netherlands pp. 99-112Yamada, R., Tagami, T., Nishimura, S., Ito, H., Annealing kinetics of fission tracks in zircon: An experimental study (1995) Chem. Geol. Isot. Geosci. Sect., 122, pp. 249-258Yamada, R., Murakami, M., Tagami, T., Statistical modeling of annealing kinetics of fission tracks in zirconReassessment of laboratory experiments (2007) Chem. Geol., 236, pp. 75-9
Improved Zircon Fission-track Annealing Model Based On Reevaluation Of Annealing Data
No full textThe thermal recovery (annealing) of mineral structure modified by the passage of fission fragments has long been studied by the etching technique. In minerals like apatite and zircon, the annealing kinetics are fairly well constrained from the hour to the million-year timescale and have been described by empirical and semi-empirical equations. On the other hand, laboratory experiments, in which ion beams interact with minerals and synthetic ceramics, have shown that there is a threshold temperature beyond which thermal recovery impedes ion-induced amorphization. In this work, it is assumed that this behavior can be extended to the annealing of fission tracks in minerals. It is proposed that there is a threshold temperature, T0, beyond which fission tracks are erased within a time t0, which is independent of the current state of lattice deformation. This implies that iso-annealing curves should converge to a fanning point in the Arrhenius pseudo-space (ln t vs. 1/T). Based on the proposed hypothesis, and laboratory and geological data, annealing equations are reevaluated. The geological timescale estimations of a model arising from this study are discussed through the calculation of partial annealing zone and closure temperature, and comparison with geological sample constraints found in literature. It is shown that the predictions given by this model are closer to field data on closure temperature and partial annealing zone than predictions given by previous models. © 2012 Springer-Verlag Berlin Heidelberg.40293106Afra, B., Lang, M., Rodriguez, M.D., Zhang, J., Giulian, R., Kirby, N., Ewing, R.C., Kluth, P., Annealing kinetics of latent particle tracks in Durango apatite (2011) Phys Rev B, 83, p. 064116Bai, X.M., Voter, A.F., Hoagland, R.G., Nastasi, M., Uberuaga, B.P., Efficient annealing of radiation damage near grain boundaries via interstitial emission (2010) Science, 237, pp. 1631-1634Barbarand, J., Carter, A., Wood, I., Huford, T., Compositional and structural control of fission-track annealing in apatite (2003) Chem Geol, 198, pp. 107-137Caldeira, A.O., Leggett, A.J., Influence of dissipation on quantum tunneling in macroscopic systems (1982) Phys Rev Lett, 46, pp. 211-214Caldeira, A.O., Leggett, A.J., Quantum tunnelling in a dissipative system (1983) Ann Phys, 149, pp. 374-456Carlson, W.D., Mechanisms and kinetics of apatite fission-track annealing (1990) Am Miner, 75, pp. 1120-1139Carlson, W.D., Mechanisms and kinetics of apatite fission-track annealing-reply to Kevin D. Crowley (1993) Am Miner, 78, pp. 213-215Carlson, W.D., Mechanisms and kinetics of apatite fission-track annealing-Reply to Green et al (1993) Am Miner, 78, pp. 446-449Carlson, W.D., Donelick, R.A., Ketcham, R.A., Variability of apatite fission-track annealing kinetics: I. Experimental results (1999) Am Miner, 84, pp. 1213-1223Crowley, K.D., Mechanisms and kinetics of apatite fission-track annealing-Discussion (1993) Am Miner, 78, pp. 210-212Crowley, K.D., Cameron, M., Schaefer, R.L., Experimental studies of annealing of etched fission tracks in fluorapatite (1991) Geoch Cosmoch Ac, 55, pp. 1449-1465Curvo, E.A., Hadler, J.C., Iunes, P.J., Guedes, S., Tello, C.A.S., Paulo, S.R., Hackspacher, P.C., Moreira, P.A.F.P., On epidote fission track dating (2005) Radiat Meas, 39 (641), p. 645Dodson, M.H., Cooling temperature in cooling geochronological and petrological systems (1973) Contrib Miner Petr, 40, pp. 259-274Duddy, I.R., Green, P.F., Laslett, G.M., Thermal annealing of fission tracks in apatite. 3. 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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
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Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
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koamabayili/VECTRON-author-checklist: VECTRON author checklist
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Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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