Geochemical analyses of hydrothermally altered sediments from the convergent Costa Rican margin

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doi: 10.2973/odp.proc.sr.205.207.2006
Author(s): Chavagnac, Valerie M. C.; Font, Laura; Milton, J. Andy; Croudace, Ian W.
Ocean Drilling Program, Leg 205, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
Southampton Oceanography Centre, School of Ocean and Earth Sciences, Southampton, United Kingdom
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, 16p. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 1096-2514
Note: In English. Data report; available only on CD-ROM in PDF format and on the Web in PDF or HTML; data report. 13 refs.CD-ROM, ISSN 1096-2514; WWW, ISSN 1096-7451; illus., incl. 2 tables
Summary: Bulk geochemical analyses were carried out on 27 sediment samples located just above the igneous section of the incoming plate along the Costa Rican convergent margin. This pilot study was intended to determine whether hydrothermal activity within the sediment section could be detected within the bulk sediment. The metaliferous index (100 × Al/ [Al + Fe + Mn]) values on bulk sediment (24.3 < × < 43.3) are all much lower than the value for deep pelagic sediment (50.8) but higher than the value for the hydrothermal sulfide from the East Pacific Rise (1). The high Zn, Cu, and Co concentrations associated with high Ba content for a constant detrital input (molar Ti/Al = 0.121 ± 0.026) indicate that the transition metal enrichment is not related to volcanic ash but rather to Fe-Mn oxides, sulfides, and barite. These observations testify to a record of hydrothermal activity within the 70 m of sediment overlying the basement.
Year of Publication: 2006
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; Central America; Concentration; Costa Rica; East Pacific; Geochemistry; Hydrochemistry; Hydrothermal alteration; Leg 205; Marine sediments; Metals; Metasomatism; Middle America Trench; North Pacific; Northeast Pacific; Ocean Drilling Program; Pacific Ocean; Pore water; Sediments
Coordinates: N093800 N094000 W0861000 W0861200
Record ID: 2007025132
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