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Abiogenic formation of H2, light hydrocarbons and other short-chain organic compounds within the serpentinite mud volcanoes of the Marianna Trench

Abiogenic formation of H2, light hydrocarbons and other short-chain organic compounds within the serpentinite mud volcanoes of the Marianna Trench
Abiogenic formation of H2, light hydrocarbons and other short-chain organic compounds within the serpentinite mud volcanoes of the Marianna Trench

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.

2100-014X
1-4
Sissmann, Olivier
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Price, Roy
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Elvert, Marcus
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Heuer, Verena B.
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Prieto, Xavier
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Monnin, Christophe
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Rouchon, Virgile
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Noirez, Sonia
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Beaumont, Valérie
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Ammouïal, Jérémie
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Kohler, Eric
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Menzies, Catriona
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Ryan, Jeffrey
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Takai, Ken
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Sissmann, Olivier
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Price, Roy
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Elvert, Marcus
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Heuer, Verena B.
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Prieto, Xavier
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Monnin, Christophe
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Rouchon, Virgile
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Noirez, Sonia
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Beaumont, Valérie
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Ammouïal, Jérémie
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Kohler, Eric
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Menzies, Catriona
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Ryan, Jeffrey
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Takai, Ken
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Sissmann, Olivier, Price, Roy, Elvert, Marcus, Heuer, Verena B., Prieto, Xavier, Monnin, Christophe, Rouchon, Virgile, Noirez, Sonia, Beaumont, Valérie, Ammouïal, Jérémie, Kohler, Eric, Menzies, Catriona, Ryan, Jeffrey and Takai, Ken (2019) Abiogenic formation of H2, light hydrocarbons and other short-chain organic compounds within the serpentinite mud volcanoes of the Marianna Trench. EPJ Web of Conferences, 98, 1-4. (doi:10.1051/e3sconf/20199802011).

Record type: Article

Abstract

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.

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e3sconf_wri-162018_02011 - Version of Record
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e-pub ahead of print date: 7 June 2019
Venue - Dates: 16th International Symposium on Water-Rock Interaction, WRI 2019 and 13th International Symposium on Applied Isotope Geochemistry, 1st IAGC International Conference, Tomsk, Russian Federation, 2019-07-21 - 2019-07-26

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Local EPrints ID: 432051
URI: https://eprints.soton.ac.uk/id/eprint/432051
ISSN: 2100-014X
PURE UUID: a880f188-aa61-42b8-ae2c-c030b736fb38

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Date deposited: 28 Jun 2019 16:30
Last modified: 30 Jul 2019 16:30

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Contributors

Author: Olivier Sissmann
Author: Roy Price
Author: Marcus Elvert
Author: Verena B. Heuer
Author: Xavier Prieto
Author: Christophe Monnin
Author: Virgile Rouchon
Author: Sonia Noirez
Author: Valérie Beaumont
Author: Jérémie Ammouïal
Author: Eric Kohler
Author: Catriona Menzies
Author: Jeffrey Ryan
Author: Ken Takai

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