Possible algal origin of long chain odd n-alkanes in immature sediments as revealed by distributions and carbon isotope ratios |
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| Authors: | ric Lichtfouse Sylvie Derenne Andr Mariotti Claude Largeau |
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| Institution: | Éric Lichtfouse, Sylvie Derenne, André Mariotti,Claude Largeau |
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| Abstract: | A Pliocene oil shale (Pula, Hungary), a C3 plant Triticum aestivum and a C4 plant Zea mays were compared using isotopic composition of bulk organic matter, along with distributions and individual carbon isotope ratios of n-alkanes from organic extracts. The microalga Botryococcus braunii (A race) was thus shown to be the main source of the predominant 27, 29 and 31 n-alkanes of Pula sediment Therefore, the dominance of odd carbon-numbered n-alkanes in the range C25–35 in extracts from immature sediments shall not be systematically assigned to higher plant contribution but algal input is also possible. In fact, the long chain n-alkanes with an odd predominance previously observed in extracts of various immature sediments are likely to be derived at least partially, from algae. |
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| Keywords: | carbon-13 n-alkane n-alkene Pula oil shale Botryococcus braunii alga plant waxes sediment |
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