Lipid/bitumen maturation by hydrothermal activity in sediments of Middle Valley, Leg 139

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Abstract

Fluid migration through these sediments has resulted in an influx of mature organic components, yielding diverse bitumen mixtures. At Site 857 the alteration has occurred in situ to the catagenetic stage and at Site 858, the hottest holes, the hydrothermal petroleums have migrated after generation. Maturation for the n-alkanes proceeds from high CPI values to <1.0 (i.e., strong even-carbon-number preference), and due to the low TOC these sediments do not generate high amounts of hydrocarbons from kerogen, thus revealing this unique carbon number preference. -from Author

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Simoneit, B. R. T. (1994). Lipid/bitumen maturation by hydrothermal activity in sediments of Middle Valley, Leg 139. Proc., Scientific Results, ODP Leg 139, Middle Valley, Juan de Fuca Ridge, 447–465. https://doi.org/10.2973/odp.proc.sr.139.237.1994

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