Hydrothermal petroleum at the seafloor and organic matter alteration in sediments of Middle Valley, Northern Juan de Fuca Ridge

Sediments from high heat flow areas of Middle Valley, Northern Juan de Fuca Ridge, contain traces of bitumens with insignificant amounts of thermogenic components and mainly lipid material which has experienced accelerated diagenesis. These sediments have been exposed to mild hydrothermal conditions...

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Bibliographic Details
Published in:Applied geochemistry 1992, Vol.7 (3), p.257-264
Main Authors: Simoneit, B.R.T., Goodfellow, W.D., Franklin, J.M.
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Hydrocarbons
Marine
Sedimentary rocks
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Summary:Sediments from high heat flow areas of Middle Valley, Northern Juan de Fuca Ridge, contain traces of bitumens with insignificant amounts of thermogenic components and mainly lipid material which has experienced accelerated diagenesis. These sediments have been exposed to mild hydrothermal conditions (50–120°C), based on their bitumen compositions. The hydrothermal bitumen in a barite alteration products. The aliphatic fraction represents the mildly transformed and immature matter and the major polynuclear aromatic hydrocarbons are the high temperature constituents (>300°C). The 14C age of this bitumen is about 29 000 aBP, reflecting rapid organic carbon cycling.
ISSN:0883-2927
1872-9134
DOI:10.1016/0883-2927(92)90041-Z