Origin of Hydrocarbons in Hydrothermal Sulfide Ores in the Mid-Atlantic Ridge |
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| Authors: | Lein A Yu Peresypkin V I Simoneit B R T |
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| Institution: | (1) Shirshov Institute of Oceanology, Russian Academy of Sciences, Nakhimovskii pr. 36, Moscow, 117851, Russia;(2) Oil and Environment Geochemistry Group, College of Ocean and Atmosphere Sciences, Oregon State University, Corvallis, QR, 97331, United States |
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| Abstract: | The Rainbow hydrothermal field (36° N Mid-Atlantic Ridge) is one of the three presently known fields related to serpentinization of ultramafic rocks accompanied by the formation of hydrogen- and methane-rich solutions. Gas chromatographic (GC) and molecular gas chromatographic–mass spectrometric (GC-MS) investigations of sulfide ores and sediments from this field confirmed a predominantly biological nature of bitumoids related to the high-temperature transformation of biomass of the hydrothermal biological community. At the same time, ores of the Rainbow field contain significant amounts of compounds that are not directly related to biogenic synthesis. This fact suggests the possibility of an abiogenic synthesis of methane and even complex hydrocarbons during the serpentinization of ultramafic rocks. |
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