Long-chain alkenones in sulfate lakes and its paleoclimatic implications
The proxy of U37^K index is widely applied to reconstructing paleotemperature in the marine environment. However, the long-chain alkenones (LCAs) research is rarely reported in the liminic system. In this paper, we studied LCAs in the surface sediments (0---I0 cm) of nine sulfate lakes in the Inner...
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Published in | Chinese science bulletin Vol. 49; no. 19; pp. 2082 - 2086 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Beijing
Springer Nature B.V
01.10.2004
National Research Center of Geoanalysis, Beijing 100037, China%Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China%Center for Analysis and Prediction, CSB, Beijing 100036, China%Institute of Mineral Resources and Open Laboratory of Saline Lake Resources and Environment, Chinese Academy of Geological Sciences, Beijing 100037, China |
Subjects | |
Online Access | Get full text |
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Summary: | The proxy of U37^K index is widely applied to reconstructing paleotemperature in the marine environment. However, the long-chain alkenones (LCAs) research is rarely reported in the liminic system. In this paper, we studied LCAs in the surface sediments (0---I0 cm) of nine sulfate lakes in the Inner Mongolia Autonomous Region, Xinjiang Uygur Autonomous Region and Qinghai Province, China. LCAs are detected in eight of the nine lakes, except a dry salt lake-Lake Lop. The result shows that LCAs might be universal in the sulfate lakes. In most of the surface samples, the sequence of the abundance of the long-chain alkenones is C37>C38>C39>C40. And C37:4 methyl ketone is a predominant compound in the C37 alkenone homologue. Based on regression analysis of U37^K-ratios and the average annual, seasonal(spring, summer, autumn, winter) temperatures, the linearrelativity of U37^K-ratios and mean annual temperatures is superior to the others, and the correlation coefficient is 0.88(r^2=0.88). The linear relationship of U37^K and the average annual temperature in different water chemistry environments suggests that the mechanisms controlling U37^K index in the saline lakes might be the same as those in the ocean environment. The alkenone unsaturation could become an important paleotemperature proxy in the lacustrine environment. |
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Bibliography: | P332.6 11-1785/N P941.78 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1001-6538 2095-9273 1861-9541 2095-9281 |
DOI: | 10.1360/03wd0298 |