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Modeling thermal history of subducting crust in Nankai Trough: Constraints from in situ sediment temperature and diagenetic reaction progress
Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
Department of Geological Sciences, University of Missouri, Columbia, Missouri, USA
Values of borehole temperature and %-smectite in illite/smectite mixed-layer clay provide important information about the basal heat flux history of the Nankai Trough subduction zone. Numerical simulations of sediment accumulation, heat conduction, and illite/smectite diagenesis permit comparisons of various thermal-history scenarios for ODP Site 1173. In our preferred models, basal heat flux during the first 10 Ma of sedimentation was near typical values for conductively cooling crust. During the last 5 Ma, basal heat flux was higher than expected. The anomalous heat flux was likely influenced by both off-axis volcanism and hydrothermal circulation.
Received 22 February 2005; accepted 15 April 5005; published 7 May 2005.
Citation: (2005), Modeling thermal history of subducting crust in Nankai Trough: Constraints from in situ sediment temperature and diagenetic reaction progress, Geophys. Res. Lett., 32, L09301, doi:10.1029/2005GL022793.
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