Fluid and gas fluxes from the Logatchev hydrothermal vent area

Schmale, Oliver, Walter, Maren, Schneider von Deimling, Jens, Sültenfuß, Jürgen, Walker, Sharon, Rehder, Gregor and Keir, Robin (2012) Fluid and gas fluxes from the Logatchev hydrothermal vent area Geochemistry Geophysics Geosystems, 13 (7). Q07007. DOI 10.1029/2012GC004158.

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Abstract

The Logatchev hydrothermal field at 14°45′N on the MAR is characterized by gas plumes that are enriched in methane and helium compared to the oceanic background. We investigated CH4 concentration and δ13C together with δ3He in the water column of that region. These data and turbidity measurements indicate that apart from the known vent fields, another vent site exists northeast of the vent field Logatchev 1. The distribution of methane and 3He concentrations along two sections were used in combination with current measurements from lowered acoustic Doppler current profilers (LADCP) to calculate the horizontal plume fluxes of these gases. According to these examinations 0.02 μmol s−1 of 3He and 0.21 mol s−1 of methane are transported in a plume that flows into a southward direction in the central part of the valley. Based on 3He measurements of vent fluid (22 ± 6 pM), we estimate a total vent flux in this region of about 900 L s−1 and a total flux of CH4 of 3.2 mol s−1.

Document Type: Article
Keywords: Mid-Atlantic Ridge; helium; hydrothermal; hydrothermal fluxes; methane; plumes
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
DOI etc.: 10.1029/2012GC004158
ISSN: 1525-2027
Projects: SPP 1144 "From Mantle to Ocean"
Expeditions/Models:
Date Deposited: 31 Jul 2012 10:32
Last Modified: 01 Mar 2018 12:16
URI: http://eprints.uni-kiel.de/id/eprint/14939

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