Widespread fluid expulsion along the seafloor of Costa Rica convergent margin.

Bohrmann, Gerhard, Jung, Carmen, Heeschen, Katja, Weinrebe, Reimer Wilhelm, Cailleau, B., Heath, R., Hühnerbach, Veit, Hort, Matthias, Masson, D. and Trummer, Irmgard (2002) Widespread fluid expulsion along the seafloor of Costa Rica convergent margin. Terra Nova, 14 . pp. 69-79. DOI 10.1046/j.1365-3121.2002.00400.x.

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Abstract

Active fluid and gas transport were measured and observed along more than 200 km of the convergent margin of Costa Rica during cruise SO144-2 aboard RV Sonne. Ten profiles were run with the TV-sled OFOS, eight of which detected the dense occurrence of cold vent sites. This discovery shows that seafloor fluid expulsion is widely spread along the Pacific margin of Costa Rica. Surficial evidence of fluid expulsion is indicated by the appearance of chemosynthetic vent organisms such as bacterial mats, vesicomyid, solemyid and mytilid bivalves and tubeworms. Numerous active vents were indicated by elevated methane concentrations (≤ 200 nmol L–) in the bottom water. Although fluid-venting activity was known previously from a small area south of Nicoya Peninsula, the present study documents active seepage at landslides, headwall scarps related to seamount subduction, morphological intersections of faults and mid-slope mud volcanoes.

Document Type: Article
Keywords: RV Sonne, SO144/2, Costa Rica convergent margin, fluid transport
Research affiliation: OceanRep > SFB 574 > A1
OceanRep > SFB 574
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1046/j.1365-3121.2002.00400.x
ISSN: 0954-4879
Contribution Number:
ProjectNumber
SFB 5745
Expeditions/Models/Experiments:
Date Deposited: 07 Apr 2010 11:48
Last Modified: 03 Jun 2016 10:59
URI: http://oceanrep.geomar.de/id/eprint/2958

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