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

E. Silver, M. Kastner, A. Fisher, J. Morris, K. McIntosh, D. Saffer

Research output: Contribution to journalArticle

79 Citations (Scopus)

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, décollement, 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.

Original languageEnglish (US)
Pages (from-to)679-682
Number of pages4
JournalGeology
Volume28
Issue number8
DOIs
StatePublished - Jan 1 2000

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fluid flow
trench
subduction zone
sediment
seawater
fluid
dewatering
sedimentary sequence
dehydration
low flow
heat flow
island arc
compaction
slab
porewater
hydrology
subduction
geochemistry
magma
permeability

All Science Journal Classification (ASJC) codes

  • Geology

Cite this

Silver, E. ; Kastner, M. ; Fisher, A. ; Morris, J. ; McIntosh, K. ; Saffer, D. / Fluid flow paths in the Middle America Trench and Costa Rica margin. In: Geology. 2000 ; Vol. 28, No. 8. pp. 679-682.
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Silver, E, Kastner, M, Fisher, A, Morris, J, McIntosh, K & Saffer, D 2000, 'Fluid flow paths in the Middle America Trench and Costa Rica margin', Geology, vol. 28, no. 8, pp. 679-682. https://doi.org/10.1130/0091-7613(2000)28<679:FFPITM>2.0.CO;2

Fluid flow paths in the Middle America Trench and Costa Rica margin. / Silver, E.; Kastner, M.; Fisher, A.; Morris, J.; McIntosh, K.; Saffer, D.

In: Geology, Vol. 28, No. 8, 01.01.2000, p. 679-682.

Research output: Contribution to journalArticle

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