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Two-dimensional finite element models of convective heat transfer in the upper crust — implications for the interpretation of fission-track data

Timar-Geng, Zoltan
Henk, Andreas
Wetzel, Andreas
2006-03
Universitätsverlag Göttingen
Article in Anthology
Verlagsversion
Deutsch
11. Symposium "Tektonik, Struktur- und Kristallingeologie"
DOI: https://doi.org/10.23689/fidgeo-1907
Timar-Geng, Zoltan; Henk, Andreas; Wetzel, Andreas, 2006-03: Two-dimensional finite element models of convective heat transfer in the upper crust — implications for the interpretation of fission-track data. In: Philipp, S.; Leiss, B; Vollbrecht, A.; Tanner, D.; Gudmundsson, A. (eds.): 11. Symposium "Tektonik, Struktur- und Kristallingeologie"; 2006, Univ.-Verl. Göttingen, p. 228 - 229., DOI https://doi.org/10.23689/fidgeo-1907.
 
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  • Abstract
Fission-track (FT) thermochronology is a tool routinely used for studies of surface denudation because of its sensitivity to the low temperatures found in the uppermost part of the crust. FT ages and associated track length distributions are regularly interpreted assuming a steady-state temperature field and only conductive heat transfer. However, application of the method to thermochronological studies based on such interpretations may lead to invalid conclusions, if the temperatures at a certain depth had actually varied with time. For example, the convective transfer of heat by hydrothermal fluids can cause transient thermal events within the upper crust. In particular, fluid circulation along fault zones can result in substantial convective heat transport and cause temperature anomalies in the adjacent rocks (Zuther & Brockamp 1988, Fleming et al. 1998, Lampe & Person 2002, Bächler et al 2003). As a consequence, any refined interpretation of FT data requires a thorough understanding of the upper crustal temperature field and its evolution through time. The main objective of this study is to assess quantitatively how convective heat transport influences the upper crustal temperature field as well as the cooling ages and track length distributions observed in apatite FT data...
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  • 11. Symposium "Tektonik, Struktur- und Kristallingeologie" , 2006-03 [74]
Subjects:
Schwarzwald
Erdkruste
Konvektion
Kernspaltspurenmethode
Oberrheinische Massen {Geologie}
Radiometrische Altersbestimmung
Druck- und Temperaturbestimmungen {Mineralogie}
Geothermik {Geophysik}
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