Leg 205 synthesis; subduction fluxes and fluid flow across the Costa Rica convergent margin

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doi: 10.2973/odp.proc.sr.205.201.2006
Author(s): Morris, Julie D.; Villinger, Heinrich W.
Ocean Drilling Program, Leg 205, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
Universität Bremen, FB Geowissenschaften, Bremen, Federal Republic of Germany
Other:
Universität Bremen, Federal Republic of Germany
Texas A&M University, United States
Southampton Oceanography Centre, United Kingdom
Woods Hole Oceanographic Institution, United States
Dalhousie University, Canada
Japan Agency for Marine-Earth Science and Technology, Japan
University of California San Diego, United States
University of Wyoming, United States
University of Florida, United States
Eidgenössische Technische Hochschule-Zentrum, Switzerland
Universita degli Studi di Modena, Italy
Volume Title: Proceedings of the Ocean Drilling Program; scientific results; fluid flow and subduction fluxes across the Costa Rica convergent margin; implications for the seismogenic zone and subduction factory; covering Leg 205 of the cruises of the Drilling Vessel JOIDES Resolution; Victoria, Canada, to Balboa, Panama; Sites 1253-1255; 2 September-6 November 2002
Volume Author(s): Morris, Julie D.; Villinger, Heinrich W.; Klaus, Adam; Cardace, Dawn M.; Chavagnac, Valerie M. C.; Clift, Peter D.; Haeckel, Matthias; Hisamitsu, Toshio; Kastner, Miriam; Pfender, Marion; Saffer, Demian M.; Santelli, Cara; Schramm, Burkhard; Screaton, Elizabeth J.; Solomon, Evan A.; Strasser, Michael; Moe, Kyaw Thu; Vannucchi, Paola
Source: Proceedings of the Ocean Drilling Program; scientific results; fluid flow and subduction fluxes across the Costa Rica convergent margin; implications for the seismogenic zone and subduction factory; covering Leg 205 of the cruises of the Drilling Vessel JOIDES Resolution; Victoria, Canada, to Balboa, Panama; Sites 1253-1255; 2 September-6 November 2002, Julie D. Morris, Heinrich W. Villinger, Adam Klaus, Dawn M. Cardace, Valerie M. C. Chavagnac, Peter D. Clift, Matthias Haeckel, Toshio Hisamitsu, Miriam Kastner, Marion Pfender, Demian M. Saffer, Cara Santelli, Burkhard Schramm, Elizabeth J. Screaton, Evan A. Solomon, Michael Strasser, Kyaw Thu Moe and Paola Vannucchi; Ocean Drilling Program, Leg 205, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results (CD ROM), Vol.205, 54p. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 1096-2514
Note: In English. Also available on CD-ROM in PDF format and on the Web in PDF or HTML. 100 refs.CD-ROM, ISSN 1096-2514; WWW, ISSN 1096-7451; illus., incl. sect., strat. cols., 4 tables, sketch maps
Summary: Ocean Drilling Program (ODP) Leg 205 was designed to investigate subduction fluxes and fluid flow across the Costa Rica convergent margin. During Leg 205, modified CORK-IIs (new-generation Circulation Obviation Retrofit Kits) were installed within the incoming plate and the décollement zone to monitor pressure and temperature of formation fluids through time and to collect a time series of fluid samples for chemical analysis. One subseafloor observatory is monitoring within a highly fractured region of the incoming igneous section. Vigorous, slightly subhydrostatic flow within high-permeability horizons is observed; fluid compositions appear to be a mixture of bottom seawater and components distinct from seawater. The observatory within the décollement zone reveals pressures that are just slightly overpressured; excursions in the pressure and temperature record correlate temporally with excursions in fluid composition and flow rate variation, all occurring during periods of aseismic strain, recorded geodetically. Igneous and sedimentary core materials collected during Leg 205 have been studied extensively in combination with materials recovered during ODP Leg 170. This synthesis and papers in this volume report on the igneous and alteration history of the incoming oceanic section and its implications for off-axis magmatism and fluid flow, the composition of incoming and underthrust sediments with implications for fluid and element loss from the shallow subduction zone, the structure and permeability characteristics of the forearc sediment wedge, and the consequences of sediment dynamics and fluid flow to the seismogenic zone and subduction factory.
Year of Publication: 2006
Research Program: ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Biostratigraphy; Central America; Cores; Costa Rica; East Pacific; Geochemistry; Geophysical methods; Geophysical profiles; Geophysical surveys; Igneous rocks; Leg 205; Middle America Trench; North Pacific; Northeast Pacific; Ocean Drilling Program; Ocean floors; Pacific Ocean; Petrology; Plate boundaries; Plate convergence; Plate tectonics; Seismic methods; Seismic profiles; Surveys
Coordinates: N093800 N094000 W0861000 W0861200
Record ID: 2007025130
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