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- W2013910558 abstract "Hydrous pyrolysis of the kerogen in Precambrian sedimentary rocks of a range of ages and thermal histories was used in an attempt to produce normal, iso and anteiso, isoprenoid, sterane and triterpane hydrocarbons whose structures can be related to known biochemical precursors. Gas chromatography—mass spectrometry was used in the selected ion monitoring mode to achieve a sensitivity of one part hydrocarbon in 109 of the rock. Small amounts of some of these hydrocarbon classes were found in certain Lower Cambrian and upper Precambrian sediments with normal alkanes predominating. The yields diminished with increasing age, even for well-preserved rocks where the minerals showed little effect of metamorphism. Samples with ages greater than 1.6 × 109 years yielded no detectable hydrocarbons. Spontaneous dehydrogenation of kerogen results in cross-linking, cyclization and aromatization of organic structures and extensive transformation of molecular fossils. Little information on the evolution of Precambrian life is contained in the organic matter of the rocks studied in this work. Further advances along this line will depend critically on the discovery of sediments in which the kerogen is better preserved." @default.
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- W2013910558 date "1987-01-01" @default.
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- W2013910558 title "A search for molecular fossils in the kerogen of Precambrian sedimentary rocks" @default.
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- W2013910558 doi "https://doi.org/10.1016/0301-9268(87)90003-9" @default.
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