Compositions of δ18O and δ13C in various carbonates of core RM in the Zoigê Basin and climatic significance |
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| Authors: | Jinglu Wu |
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| Institution: | (1) Nanjing Institute of Geography and Limnology, the Chinese Academy of Sciences, 210008 Nanjing, P.R. China |
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| Abstract: | The hole RM, the deepest one fully obtained core in the Qinghai-Xizang Plateau, situated in the depositional center of the
Zoige Basin (33°57′N; 102° 21′E) in the northeastern Qinghai-Xizang Plateau with a depth of 310.46 m. From 14C dating and paleomagnetic stratigraphic study, the core RM can date back to 900 ka B.P.. In this paper we analyzed the compositions
of δ18O and δ13C in various carbonates can date (snail, obstrode, chemical carbonate) in core RM and discussed preferably the paleoclimatic
record by the proxies of δ18O and δ13C of chemical carbonate (authicarbonate) from core RM in the past 140 ka. The results showed that the values of δ18O in various carbonates are generally identical, and the values of δ13C in it are inconsistent, while there exist better relativity. The studies also demonstrated that there was a negative correlation
between δ18O and δ13C of authicarbonate in core RM in the past 140 ka, showing that the changes of δ18O values were mainly relative to the water temperature. According to above, the climatic evolutionary sequence were rebuilt
in the past 140 ka in the region. |
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| Keywords: | Zoigê Basin authicarbonate stable isotope paleoclimate |
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