Hydrothermal activity at Hook Ridge in the Central Bransfield Basin, Antarctica

Bohrmann, Gerhard, Chin, C., Petersen, Sven, Sahling, Heiko, Schwarz-Schampera, U., Greinert, Jens, Lammers, Stephan, Rehder, Gregor, Daehlmann, A., Wallmann, Klaus, Dijkstra, S. and Schenke, H.-W. (1999) Hydrothermal activity at Hook Ridge in the Central Bransfield Basin, Antarctica Geo-Marine Letters, 18 (4). pp. 277-284. DOI 10.1007/s003670050080.

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Abstract

Hydrothermal activity in the Central Bransfield Basin revealed an active low-temperature vent field on top of a submarine volcanic structure. A temperature anomaly was detected and the sea floor showed various patches of white silica (opal-A) precipitate exposures and some yellow–brown Fe-oxyhydroxide crusts. Enriched dissolved methane concentrations were encountered. Sediment was near 24°C just after the grab came on deck. No dense population of chemosynthetically based macrofauna known from other hydrothermal venting areas was present, except for pogonophora. The observations suggest that the sedimented hydrothermal field at Hook Ridge is a low-temperature end-member branch from a deeper hydrothermal source.

Document Type: Article
Keywords: Hydrothermal activity, Hook Ridge, Central Bransfield Basin, Antarctica
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
AWI
Refereed: Yes
DOI etc.: 10.1007/s003670050080
ISSN: 0276-0460
Date Deposited: 12 Sep 2008 15:05
Last Modified: 29 Jun 2017 08:11
URI: http://eprints.uni-kiel.de/id/eprint/4194

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