Long chain alkenones preserved in Miocene lake sediments |
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| Affiliation: | 1. Institute of Tibetan Plateau Research, Chinese Academy of Sciences (CAS), Beijing 100101, China;2. Key Laboratory of Continental Collision and Plateau Uplift, CAS, Beijing 100101, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Key Laboratory of Tibetan Environment Changes and Land Surface Processes, CAS, Beijing 100101, China;5. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;6. Key Laboratory of Alpine Ecology and Biodiversity, CAS, Beijing 100101, China |
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| Abstract: | Over the last few decades, the occurrence of long chain alkenones (LCAs) in Quaternary lacustrine settings has been reported, the distributions being remarkably different from those of open ocean settings. We report here the occurrence of LCAs with modern lake-type composition from Middle Miocene sedimentary strata in the Dahonggou Section, Qaidam Basin, northern Tibetan Plateau. This is the first report of LCAs with preserved lake compositions in pre-Quaternary lacustrine sediments. The discovery implies that the producers of modern lacustrine LCAs could originate from similar lake species living at least as far back as the Miocene epoch. It also sheds new light on the potential of “alkenones” as palaeotemperature indicators in lacustrine systems back to at least 10.5 Ma. |
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