REE and Trace Element Fingerprints of Dewatering Fluids from Costa Rica Continental margin sediments.

Garbe-Schönberg, C.-Dieter, Hensen, Christian and Suess, Erwin, eds. (2003) REE and Trace Element Fingerprints of Dewatering Fluids from Costa Rica Continental margin sediments. Open Access . Geophysical Research Abstracts, 5 . UNSPECIFIED, page 12156 pp.

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Abstract

Dewatering of subducting sediments is observed in structurally contrasting settings along the fore arc region off Nicaragua and Costa Rica: (i) Carbonate mounds and associated vent biota are surficial manifestations of expelled low-salinity fluids highly enriched in methane, sulfide, and alkalinity. The composition of fluids is generally not influenced by the disintegration of gas hydrates. The source of these fluids can be related to mud diapirism. (ii) Scars originating from the subduction of seamounts provide effective pathways for the ascent of fluids, and a highly productive vent site could be sampled at the headwall of Jaco Scar. Again, these fluids are characterized by high methane and sulfide concentrations with elevated alkalinity while chlorinity is reduced. We will present REE and trace element data for pore water and seeping fluids sampled during leg Meteor 54/3a aiming at fluid source discrimination and identification. See also contribution by C. Hensen et al. in this session.

Document Type: Proceedings
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry
OceanRep > SFB 574
Kiel University
OceanRep > SFB 574 > B6
Refereed: No
Projects: SFB574
International?: Yes
Date Deposited: 07 Apr 2010 11:42
Last Modified: 23 Sep 2019 20:13
URI: https://oceanrep.geomar.de/id/eprint/1657

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