On the formation of hydrothermal vents and cold seeps in the Guaymas Basin, Gulf of California

Magmatic sill intrusions into organic-rich sediments cause the release of thermogenic CH.sub.4 and CO.sub.2 . Pore fluids from the Guaymas Basin (Gulf of California), a sedimentary basin with recent magmatic activity, were investigated to constrain the link between sill intrusions and fluid seepage...

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Bibliographic Details
Published in:Biogeosciences 2018-09, Vol.15 (18), p.5715-5731
Main Authors: Geilert, Sonja, Hensen, Christian, Schmidt, Mark, Liebetrau, Volker, Scholz, Florian, Doll, Mechthild, Deng, Longhui, Fiskal, Annika, Lever, Mark A, Su, Chih-Chieh, Schloemer, Stefan, Sarkar, Sudipta, Thiel, Volker, Berndt, Christian
Format: Article
Language:English
Subjects:
Analysis
Carbon dioxide
Carbonates
Catchment area
Catchment areas
Chemical analysis
Climate models
Cold
Composition
Computational fluid dynamics
Deactivation
Diagenesis
Fluid flow
Fluids
Gas flow
High temperature
Hydrothermal activity
Hydrothermal plumes
Hydrothermal springs
Hydrothermal systems
Hydrothermal systems (Geology)
Hydrothermal vents
Magma
Methane
Microorganisms
Modelling
Natural history
Ocean floor
Oxidation
Seawater
Sedimentary basins
Sediments
Seepage
Seepages
Vents
Water analysis
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Summary:Magmatic sill intrusions into organic-rich sediments cause the release of thermogenic CH.sub.4 and CO.sub.2 . Pore fluids from the Guaymas Basin (Gulf of California), a sedimentary basin with recent magmatic activity, were investigated to constrain the link between sill intrusions and fluid seepage as well as the timing of sill-induced hydrothermal activity. Sampling sites were close to a hydrothermal vent field at the northern rift axis and at cold seeps located up to 30 km away from the rift. Pore fluids close to the active hydrothermal vent field showed a slight imprint by hydrothermal fluids and indicated a shallow circulation system transporting seawater to the hydrothermal catchment area. Geochemical data of pore fluids at cold seeps showed a mainly ambient diagenetic fluid composition without any imprint related to high temperature processes at greater depth. Seep communities at the seafloor were mainly sustained by microbial methane, which rose along pathways formed earlier by hydrothermal activity, driving the anaerobic oxidation of methane (AOM) and the formation of authigenic carbonates.
ISSN:1726-4189
1726-4170
1726-4189
DOI:10.5194/bg-15-5715-2018