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Fluid flow paths in the Middle America Trench and Costa Rica margin

Eli Silver, Miriam Kastner, Andrew Fisher, Julie Morris, Kirk McIntosh and Demian Saffer
Fluid flow paths in the Middle America Trench and Costa Rica margin
Geology (Boulder) (August 2000) 28 (8): 679-682

Abstract

The hydrology of the subducting plate and its dewatering behavior through the shallow subduction zone is linked to the structure and deformation of the forearc prism, the nature of the seismogenic zone, the composition of seawater for selected elements, and the composition of the residual slab subducted to depths of magma generation at the volcanic arc. Two locally independent systems of fluid flow govern the transport of heat and chemistry through the Costa Rica subduction complex, a dominantly nonaccretionary subduction zone. One fluid system is the margin wedge, decollement, and underthrust sediment section. Fluid sources include local sediment compaction and mineral dehydration at depth. A second flow system occurs in basement, beneath the sedimentary sequence on the incoming plate. This region is characterized by extremely low conductive heat flow, and the sediment overlying basement has pore-water geochemistry similar to that of seawater. Flow nearly parallel to the trench could be directed by permeability associated with faults and driven by a combination of differential heating and earthquake strain cycling.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 28
Serial Issue: 8
Title: Fluid flow paths in the Middle America Trench and Costa Rica margin
Affiliation: University of California at Santa Cruz, Earth Sciences Department, Santa Cruz, CA, United States
Pages: 679-682
Published: 200008
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 28
Accession Number: 2000-056041
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., sketch map
N08°30'00" - N10°00'00", W86°30'00" - W85°00'00"
Secondary Affiliation: Scripps Institution of Oceanography, USA, United StatesWashington University, St. Louis, MO, USA, United StatesUniversity of Texas at Austin, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200018
Program Name: ODPOcean Drilling Program
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