柴达木盆地察尔汗古湖贝壳堤剖面沉积地球化学与环境变化

常凤琴; 张虎才; 陈玥; 杨明生; 牛洁; 樊红芳; 雷国良; 张文翔; 类延斌; 杨伦庆

Volume 33 Issue 2

Mar. 2008

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Article Navigation > Earth Science > 2008 > 33(2): 197-204

CHANG Feng-qin, ZHANG Hu-cai, CHEN Yue, YANG Ming-sheng, NIU Jie, FAN Hong-fang, LEI Guo-liang, ZHANG Wen-xiang, LEI Yan-bin, YANG Lun-qing, 2008. Sedimentation Geochemistry and Environmental Changes during Late Pleistocene of Paleolake Qarhan in the Qaidam Basin. Earth Science, 33(2): 197-204.

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Sedimentation Geochemistry and Environmental Changes during Late Pleistocene of Paleolake Qarhan in the Qaidam Basin

1.
State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,CAS,Nanjing 210008,China
2.
Key Laboratory of Western China’s Environments,MOE;College of Earth Sciences and Environments,Lanzhou University,Lanzhou 730000,China

Received Date: 2007-05-12
Publish Date: 2008-03-25

Abstract

Abstract

Based on the analysis of TOC, CaCO₃, δ¹³ C_org, δ¹⁸ O, δ¹³ C of shell bar sediments in the Qaidam basin and the comparison with grain size, the environmental change of the studied section are divided into five stages.From 39.7 to 35.8 ka BP is the period of high paleolake level development.From 35.8 to 33.6 ka BP and 33.6 to 27.2 ka BP, TOC and CaCO₃ contents, δ¹⁸ O value are high, while δ¹³ C_org value and median size content are low, which reflects a warm-humid climate and high lake level.During 27.2-22.3 ka BP and 22.3-17.5 ka BP, both the temperature and the lake level are lower than that of previous stages (but the climate was still warmer and more humid than that of today).The lake level decreased between 32.4 and 32.2 ka BP, 30.4 and 29.8 ka BP, 28.4 and 27.2 ka BP.Generally speaking, the climate was warm and humid in Qaidam basin and the high lake level sustained between 39.7 and 17.5 ka BP.The lake retreated abruptly at 17.5 ka BP, with a very strong increase of evaporation which resulted in the salt formation and the decrease of the high lake level.
- Qaidam basin,
- shell bar,
- stable oxygen and carbon isotopes,
- paleoenvironmental significance

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References(30)

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