Alkenones in Pleistocene Upper Bed I (1.803–1.900 Ma) sediments from Paleolake Olduvai, Tanzania

Simon C Brassell,Devon E Colcord,Andrea M Shilling,Ian G Stanistreet,Harald Stollhofen,Nicholas Toth,Kathy D Schick,Jackson K Njau,Katherine H Freeman

Organic Geochemistry（2022）

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摘要

•C37 to C40 alkenones occur in Pleistocene sediments from Paleolake Olduvai.•Alkenone distributions do not contain tetraunsaturated components.•Alkenones derive from Group II haptophytes during both wetter and drier intervals.•Temporal profiles for unsaturation indices reflect lake salinity/alkalinity.

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关键词

Alkenones,Biomarkers,Lacustrine sediments,Hominin evolution

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