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

Widespread fluid expulsion along the seafloor of the Costa Rica convergent margin
Widespread fluid expulsion along the seafloor of the Costa Rica convergent margin
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.
69-79
Bohrmann, G.
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Heeschen, K.
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Jung, C.
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Weinrebe, W.
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Baranov, B.
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Cailleau, B.
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Heath, R.
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Huehnerbach, V.
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Hort, M.
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Masson, D.
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Trummer, I.
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Bohrmann, G.
8bce9ceb-b434-4fab-b512-0e3d10085f66
Heeschen, K.
a7da037f-19c2-40aa-95a6-e70deaa3de4d
Jung, C.
c6d7a1c1-b894-4c10-b12f-437062bf40bd
Weinrebe, W.
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Baranov, B.
bd8f5cd5-bf1e-4bf8-87bb-02608c8ffb18
Cailleau, B.
64195c83-46b8-4e9f-a82e-90f9012d23ae
Heath, R.
25cb0e00-c8be-4009-9482-91f50945a74f
Huehnerbach, V.
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Hort, M.
e3856648-f946-49e0-8c8f-3e50a1a11909
Masson, D.
edd44c8b-38ca-45fb-8d0d-ac8365748a45
Trummer, I.
e374d1a2-423d-46f5-ab1c-5eaa6b8dac17

Bohrmann, G., Heeschen, K., Jung, C., Weinrebe, W., Baranov, B., Cailleau, B., Heath, R., Huehnerbach, V., Hort, M., Masson, D. and Trummer, I. (2002) Widespread fluid expulsion along the seafloor of the Costa Rica convergent margin. Terra Nova, 14 (2), 69-79. (doi:10.1046/j.1365-3121.2002.00400.x).

Record type: Article

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.

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Published date: 2002

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Local EPrints ID: 43910
URI: http://eprints.soton.ac.uk/id/eprint/43910
PURE UUID: c61a900c-c9f1-4ffa-ada9-ffb93320cdaf

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Date deposited: 01 Feb 2007
Last modified: 13 Mar 2019 21:08

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Contributors

Author: G. Bohrmann
Author: K. Heeschen
Author: C. Jung
Author: W. Weinrebe
Author: B. Baranov
Author: B. Cailleau
Author: R. Heath
Author: V. Huehnerbach
Author: M. Hort
Author: D. Masson
Author: I. Trummer

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