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TitleLinks between fluid circulation, temperature, and metamorphism in subducting slabs
AuthorSpinelli, G A; Wang, K
SourceGeophysical Research Letters vol. 36, L13302, 2009, 5 pages, (Open Access)
Alt SeriesEarth Sciences Sector, Contribution Series 20090088
Mediapaper; on-line; digital
File formatpdf
AreaNankai Trough; Pacific Ocean; Japan
Lat/Long WENS132.0000 136.0000 35.5000 31.0000
Subjectstectonics; subduction; tectonic interpretations; tectonic environments; tectonic zones; tectonic models; metamorphism; groundwater circulation; basalts; eclogites; hydrothermal alteration; hydrothermal systems; aquifers; permeability; modelling; pressure-temperature conditions; fluid flow; Nankai subduction zone
Illustrationsgeological sketch maps
ProgramReducing Risk from Natural Hazards
Released2009 07 02
AbstractThe location and timing of metamorphic reactions in subducting lithosphere are influenced by thermal effects of fluid circulation in the ocean crust aquifer. Fluid circulation in subducting crust extracts heat from the Nankai subduction zone, causing the crust to pass through cooler metamorphic facies than if no fluid circulation occurs. This fluid circulation shifts the basalt-to-eclogite transition and the associated slab dehydration 14 km deeper (35 km farther landward) than would be predicted with no fluid flow. For most subduction zones, hydrothermal cooling of the subducting slab will delay eclogitization relative to estimates made without considering fluid circulation.