FN Archimer Export Format
PT J
TI The Production of Methane, Hydrogen, and Organic Compounds in Ultramafic-Hosted Hydrothermal Vents of the Mid-Atlantic Ridge
BT 
AF KONN, Cecile
   CHARLOU, Jean-Luc
   HOLM, N. G.
   MOUSIS, O.
AS 1:1;2:1;3:2;4:3;
FF 1:PDG-REM-GM-LGM;2:PDG-REM-GM-LGM;3:;4:;
C1 IFREMER, Unite Geosci Marine, Lab Geochime & Metallogenie, F-29280 Plouzane, France.
   Stockholm Univ, Dept Geol Sci, SE-10691 Stockholm, Sweden.
   Aix Marseille Univ, CNRS, LAM, UMR 7326, Marseille, France.
C2 IFREMER, FRANCE
   UNIV STOCKHOLM, SWEDEN
   UNIV AIX MARSEILLE, FRANCE
SI BREST
SE PDG-REM-GM-LGM
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
IF 2.628
TC 97
UR https://archimer.ifremer.fr/doc/00270/38139/36281.pdf
LA English
DT Article
CR EXOMAR
   SERPENTINE
BO Unknown
   Pourquoi pas ?
AB Both hydrogen and methane are consistently discharged in large quantities in hydrothermal fluids issued from ultramafic-hosted hydrothermal fields discovered along the Mid-Atlantic Ridge. Considering the vast number of these fields discovered or inferred, hydrothermal fluxes represent a significant input of H-2 and CH4 to the ocean. Although there are lines of evidence of their abiogenic formation from stable C and H isotope results, laboratory experiments, and thermodynamic data, neither their origin nor the reaction pathways generating these gases have been fully constrained yet. Organic compounds detected in the fluids may also be derived from abiotic reactions. Although thermodynamics are favorable and extensive experimental work has been done on Fischer-Tropsch-type reactions, for instance, nothing is clear yet about their origin and formation mechanism from actual data. Since chemolithotrophic microbial communities commonly colonize hydrothermal vents, biogenic and thermogenic processes are likely to contribute to the production of H-2, CH4, and other organic compounds. There seems to be a consensus toward a mixed origin (both sources and processes) that is consistent with the ambiguous nature of the isotopic data. But the question that remains is, to what proportions? More systematic experiments as well as integrated geochemical approaches are needed to disentangle hydrothermal geochemistry. This understanding is of prime importance considering the implications of hydrothermal H-2, CH4, and organic compounds for the ocean global budget, global cycles, and the origin of life. Key Words: Hydrogen-Methane-Organics-MAR-Abiotic synthesis-Serpentinization-Ultramafic-hosted hydrothermal vents. Astrobiology 15, 381-399.
PY 2015
PD MAY
SO Astrobiology
SN 1531-1074
PU Mary Ann Liebert, Inc
VL 15
IS 5
UT 000354612400006
BP 381
EP 399
DI 10.1089/ast.2014.1198
ID 38139
ER

EF