|
Read Full Article (file size: 303136 bytes) Cited by
GEOPHYSICAL RESEARCH LETTERS,
VOL. 32,
L09301,
doi:10.1029/2005GL022793,
2005
Modeling thermal history of subducting crust in Nankai Trough: Constraints from in situ sediment temperature and diagenetic
reaction progress
G. A. Spinelli
Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
M. B. Underwood
Department of Geological Sciences, University of Missouri, Columbia, Missouri, USA
Abstract
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.
Index Terms: 3015 Marine Geology and Geophysics: Heat flow (benthic); 3022 Marine Geology and Geophysics: Marine sediments: processes and transport; 8130 Tectonophysics: Heat generation and transport; 8170 Tectonophysics: Subduction zone processes (1031, 3060, 3613, 8413).
Read Full Article (file size: 303136 bytes) Cited by
Citation: Spinelli, G. A., and M. B. Underwood
(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.
Copyright 2005 by the American Geophysical Union.
|