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Modeling thermal history of subducting crust in Nankai Trough: Constraints from in situ sediment temperature and diagenetic reaction progress
Author(s) -
Spinelli G. A.,
Underwood M. B.
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl022793
Subject(s) - geology , illite , diagenesis , oceanic crust , heat flux , volcanism , subduction , crust , borehole , petrology , sediment , trough (economics) , geochemistry , seafloor spreading , geophysics , clay minerals , tectonics , geomorphology , seismology , heat transfer , paleontology , physics , thermodynamics , macroeconomics , economics
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.