Cardace, Dawn M. et al. (2006): Habitability of subseafloor sediments at the Costa Rica convergent margin

Leg/Site/Hole:
ODP 205
Identifier:
2007-025137
georefid
10.2973/odp.proc.sr.205.213.2006
doi
Creator:
Cardace, Dawn M.
Washington University, Department of Earth and Planetary Sciences, Saint Louis, MO, United States
author
Morris, Julie D.
Universitaet Bremen, Federal Republic of Germany
author
Peacock, A. D.
Texas A&M University, United States
author
White, D. C.
Southampton Oceanography Centre, United Kingdom
author
Identification:
Habitability of subseafloor sediments at the Costa Rica convergent margin
2006
In: 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, 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
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
205
Assessing the habitability of deep-sea sediments undergoing compaction, compression, and subduction at convergent margins adds to our understanding of the limits of the terrestrial biosphere. In this work, we report exploratory biomarker data on sediments obtained at Ocean Drilling Program (ODP) Sites 1253, 1254, and 1255 during drilling at the Costa Rica subduction trench and forearc sedimentary wedge. The samples selected for postcruise biomarker analyses were located within intervals of potentially enhanced fluid flow within the decollement and sedimentary wedge fault zones (Sites 1254 and 1255) and within basal carbonates at the reference site (Site 1253). The passage of fluids that are geochemically distinct from ambient interstitial water provides a disequilibrium setting that may enhance habitability. Biomarker data show low levels of microbial biomass in subseafloor sediments sampled at the Costa Rica convergent margin as deep as approximately 370 meters below seafloor.
English
Serial
Coverage:Geographic coordinates:
North:9.4000
West:-86.1200East: -86.1000
South:9.3800
Oceanography; biomarkers; biomass; Central America; Costa Rica; deep-sea environment; East Pacific; ecology; fault zones; faults; habitat; Leg 205; marine environment; marine sediments; microorganisms; Middle America Trench; North Pacific; Northeast Pacific; Ocean Drilling Program; Pacific Ocean; plate boundaries; plate tectonics; sediments; submarine environment;
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