Seepage Systematic of Different Geological Settings: Reflected in Time Scales and Controls of Microbially Mediated Carbonate Formation.

Liebetrau, Volker, Eisenhauer, Anton, Fietzke, Jan, Suess, Erwin, Kutterolf, Steffen, Reitner, J., Thiel, V., Seifert, R., Stadnitskaia, A., Han, X. and Linke, Peter (2010) Seepage Systematic of Different Geological Settings: Reflected in Time Scales and Controls of Microbially Mediated Carbonate Formation. [Talk] In: SFB 574 Subduction Workshop. , 04.-07.11.2010, Pucon, Chile .

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Abstract

Cold seep ecosystems are often characterized by carbonate precipitation processes fueled by methane-rich fluids and microbial activity. Understanding and quantifying feedback mechanisms between methane sources, ocean chemistry, and climate requires detailed data about the dynamics of seafloor methane emanation throughout geological time.
Carbonates from these ecosystems provide unique archives of marine methane emanation by their geobiological, geochemical, mineralogical, and structural inventory. Precise and high resolution geochronology of these
archives provides new insights into the rate and duration of precipitation processes and the related microbial activity. In this compilatory study large carbonate samples from very different cold seep settings were investigated for the time scales of their formation and their specific precipitation environment. Beside new insights into growth structures, emplacement processes and initial approaches on high resolution geochemistry and biomarker analyses [1], special emphasis was given to the geochronological identification of paleo-seep-activity phases.
The actual data set is spanning a wide range in space and time. It covers circum-Pacific settings (South China Sea, Costa Rica & Nicaragua, New Zealand), including more than 200 thousand years old archives ( Hydrate Ridge, off Oregon), and almost recent methane-related carbonates from Black Sea and Mediterranean Sea.
On long time scales, the data indicates sea level decrease as an important enhancement factor for focused methane flux via destabilization of underlying gas hydrates upon hydraulic pressure release. Data from tectonically highly
active settings imply structural changes as major control on initiation and position of cold seeps and their activation on short time scales [2, 3].
[1] Leefmann et al. (2008) BG. [2] Kutterolf et al. (2008) Geology, doi: 10.1130/G24806A [3] Liebetrau et al. (2010) MG,
doi:10.1016/j.margeo.2010.01.003

Document Type: Conference or Workshop Item (Talk)
Keywords: Meeresgeologie
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
OceanRep > SFB 574 > B6
OceanRep > SFB 574
Date Deposited: 07 Dec 2010 12:54
Last Modified: 23 Feb 2012 05:35
URI: http://oceanrep.geomar.de/id/eprint/10377

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