中国地理科学(英文版) ›› 1997, Vol. 7 ›› Issue (3): 229-235.

• 论文 • 上一篇    下一篇

COMPOSITIONS OF δ18O AND δ13C IN VARIOUS CARBONATES OF CORE RM IN THE ZOIGê BASIN AND CLIMATIC SIGNIFICANCE

吴敬禄   

  1. Nanjing Institute of Geography and Limnology, the Chinese Academy of Sciences, Nanjing 210008, P. R. China
  • 出版日期:1997-09-20 发布日期:2011-12-16

COMPOSITIONS OF δ18O AND δ13C IN VARIOUS CARBONATES OF CORE RM IN THE ZOIGê BASIN AND CLIMATIC SIGNIFICANCE

Wu Jinglu   

  1. Nanjing Institute of Geography and Limnology, the Chinese Academy of Sciences, Nanjing 210008, P. R. China
  • Online:1997-09-20 Published:2011-12-16

摘要:

The hole RM, the deepest one fully obtained core in the Qinghai-Xizang Plateau, situated in the depositional center of the Zoire Basin (33°57′N; 102°21′E) in the northeastern QinghaiXizang Plateau with a depth of 310.46 m. From 14C dating and Paleomagnetic stratigraphic study,the core RM can date back to 900 ha B.P.. In this paper we analyzed the compositions of δ18O and δ13C in various carbonates can date (snail, obstrode, chemical Cabonate) in core RM and discussed preferably the paleoclimatic record by the proxies of δ18O and δ13C Of chemical carbonate (authicalbonate) 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 authicabonate 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.

关键词: Zoigê, Basin, authicarbonate, stable isotope, paleoclimate

Abstract:

The hole RM, the deepest one fully obtained core in the Qinghai-Xizang Plateau, situated in the depositional center of the Zoire Basin (33°57′N; 102°21′E) in the northeastern QinghaiXizang Plateau with a depth of 310.46 m. From 14C dating and Paleomagnetic stratigraphic study,the core RM can date back to 900 ha B.P.. In this paper we analyzed the compositions of δ18O and δ13C in various carbonates can date (snail, obstrode, chemical Cabonate) in core RM and discussed preferably the paleoclimatic record by the proxies of δ18O and δ13C Of chemical carbonate (authicalbonate) 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 authicabonate 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.

Key words: Zoigê, Basin, authicarbonate, stable isotope, paleoclimate