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

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-oxyhydroxi...

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Bibliographic Details
Published in:Geo-Marine Letters
Main Authors: Bohrmann, Gerhard, Chin, C., Petersen, Sven, Sahling, Heiko, Schwarz-Schampera, U., Greinert, Jens, Lammers, Stephan, Rehder, Gregor, Daehlmann, A., Wallmann, Klaus, Dijkstra, S., Schenke, H.-W.
Format: Article in Journal/Newspaper
Language:English
Published: Springer 1999
Subjects:
Hook Ridge
Antarc*
Antarctica
Online Access:https://oceanrep.geomar.de/id/eprint/4194/
https://oceanrep.geomar.de/id/eprint/4194/1/art_10.1007_s003670050080.pdf
http://www.springerlink.com/(cd1nenaadpl1qw551zicg355)/app/home/contribution.asp?referrer=parent&backto=issue,3,9;journal,29,69;linkingpublicationresults,1:100418,1
https://doi.org/10.1007/s003670050080
Description
Summary: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.

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