E3S Web Conf.
Volume 98, 201916th International Symposium on Water-Rock Interaction (WRI-16) and 13th International Symposium on Applied Isotope Geochemistry (1st IAGC International Conference)
|Number of page(s)||4|
|Section||Organic Geochemistry, Biogeochemistry, Formation of Oil and Gas Deposits|
|Published online||07 June 2019|
Abiogenic formation of H2, light hydrocarbons and other short-chain organic compounds within the serpentinite mud volcanoes of the Marianna Trench
IFP Energies Nouvelles, Rueil-Malmaison Cedex, France
2 School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, USA
3 MARUM – Center for Marine Environmental Sciences, University of Bremen, Germany
4 Geosciences Environnement Toulouse, University Paul Sabatier, France
5 School of Ocean and Earth Science, University of Southampton, UK
6 School of Geosciences, University of South Florida, USA
7 Department of Subsurface Geobiological Analysis and Research, JAMSTEC, Japan
* Corresponding author: email@example.com
Serpentinite-hosting mud volcanoes, located in the Marianna forearc subduction zone, were drilled during IODP Expedition 366. Recovered samples from Asùt Tesoru seamount provide new insights on the generation of organic matter in deep environments. Short-chain alcohols, volatile fatty acids and light hydrocarbons are produced within hyperalkaline pore fluids (pH 12.5) rich in H2. The stable isotope values of those species show heavy δ13C values, suggesting a formation process through Fischer-Tropsch-Type reactions. This close isotopic study brings new constraints on the reaction pathways leading to the formation of not only light hydrocarbons, but also of short-chain organic molecules. These compounds may serve as precursors of building blocks essential to life in deep oceanic settings.
© The Authors, published by EDP Sciences, 2019
This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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