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

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^{1, 2},
张虎才^{1, 2, ,},
陈玥²,
杨明生²,
牛洁²,
樊红芳²,
雷国良²,
张文翔²,
类延斌¹,
杨伦庆¹

1.
中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室，江苏南京 210008
2.
兰州大学资环学院，西部环境教育部重点实验室，甘肃兰州 730000

基金项目:

国家自然科学基金项目 40371117

详细信息

作者简介:
常凤琴（1976—），女，同位素与地球化学方向博士研究生

通讯作者:
张虎才, E-mail: zhanghc@niglas.ac.cn

中图分类号: P594
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- 被引次数: 0
出版历程
- 收稿日期: 2007-05-12
- 刊出日期: 2008-03-25

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

摘要

摘要: 通过对柴达木盆地察尔汗古湖贝壳堤剖面沉积物中总有机碳、有机质碳同位素及碳酸盐含量、碳氧同位素的分析, 并结合粒度数据, 将研究剖面所记录的古湖泊环境演化过程划分为5个阶段.其中254 (连续古湖泊沉积开始与第八层底部) ~210cm (距今39.7~35.8ka BP之间) 为湖泊发育期.210~185cm (距今35.8~33.6ka BP之间), 185~112cm (距今33.6~27.2ka BP之间) : TOC、CaCO₃含量较高、δ¹⁸ O值偏正, δ¹³ C_org偏负, Mz值较低, 反映了当时温度较高, 湖水水位较高; 而112~55cm (距今27.2~22.3ka BP之间) 和55~0cm (距今22.3~17.5ka BP之间) : TOC、CaCO₃含量较低、δ¹⁸ O值偏负, δ¹³ C_org偏正, Mz值较高, 表明了温度相对较低(但气候仍较温暖), 湖水水位较低, 湖泊处于退缩时期.其间分别在距今32.2~32.4ka BP、30.4~29.8ka BP和28.4~27.2ka BP出现了3次较大的退缩过程, 约22ka BP出现了一次气候突变.贝壳堤剖面揭示在39.7~18.5 ¹⁴C ka BP之间柴达木盆地气候较温暖湿润, 形成高湖面.从18.2ka BP开始, 湖泊进入退缩阶段.到17.5ka BP快速形成盐壳, 高湖面持续历史结束.
- 柴达木盆地 /
- 贝壳堤 /
- 碳氧同位素 /
- 古环境意义
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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图 1 贝壳堤野外展布及剖面位置

Fig. 1. The field distribution pattern of the shell bar and the section site

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图 2 贝壳堤剖面碳酸盐碳氧同位素相关性

Fig. 2. The coefficient between δ¹³ C and δ¹⁸ O of the CaCO₃ in shell bar section

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图 3 贝壳堤和西宁黄土碳氧同位素相关性的比较

Fig. 3. Comparison of the carbonate δ¹⁸ O and δ¹³ C between shell bar section and Late Pleistocene loess in Xining

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图 4 贝壳堤剖面δ¹³ C、δ¹⁸ O、CaCO₃含量、TOC、δ¹³ C_org和中值粒径(Mz)

Fig. 4. The δ¹³ C, δ¹⁸ O of CaCO₃ and its content, TOC content and its δ¹³ C_org and median of the grain size

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