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Molecular organic geochemical peculiarities of lacustrine core sediments in Fildes Peninsula, King George Island, Antarctica

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Chinese Science Bulletin

Abstract

The peculiarities of lipids in lacustrine core sediments from Fildes Peninsula, King George Island, Antarctica, are reported. The origin of high-molecular-weight n-alkanes, alkenes, fatty acids, alcohols Is supposed to be related to the abundant moss occurring in the sediments. Abundantiso- andanteiso-fatty acids that occur in the sediments indicate a relatively strong bacterial activity in non-ice-cover zone than in other regions in Antarctica. The C18:2 unsaturated fatty acids mainly originate from autochthonous algae in the sediment pool, and the C18:2C18:0 ratios in the profile are controlled more by paleotemperatures than source assemblies. Long-chain alkenones were identified in freshwater lacustrine sediment in Antarctica for the first time, of whichPrymnesiophyceae is assumed to be the source organism. High relative abundance of C37:4 homologue in long-chain alkenone well correlates to the severely cold climate in Antarctica.

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Authors and Affiliations

  1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640, Guangzhou, China

    Gan Zhang, Guoying Sheng, Ping’an Peng & Honghan Zheng

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  1. Gan Zhang
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  2. Guoying Sheng
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  3. Ping’an Peng
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  4. Honghan Zheng
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Correspondence to Gan Zhang.

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Zhang, G., Sheng, G., Peng, P. et al. Molecular organic geochemical peculiarities of lacustrine core sediments in Fildes Peninsula, King George Island, Antarctica. Chin. Sci. Bull. 45 (Suppl 1), 67–70 (2000). https://doi.org/10.1007/BF02893787

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  • DOI: https://doi.org/10.1007/BF02893787

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