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| Geophysical survey on the tectonic and sediment distribution of Qinghai Lake basin | |
| 基金项目： | 国家重点基础研究发展计划(973计划);国家自然科学基金;中国科学院资助项目 |
| 摘 要： | 1 Introduction in China, with an area of 4400 km2 and a drainage area With the advancement of global change study, peo- of nearly 29,660 km22]. Occurring at a “climatic triple ple are paying more and more attention to the conti- junction” among the East Asian monsoon, Indian nental environment (in which we reside), its evolution Monsoon and the Westerly Jet Stream, it lies in the and its future tendency. As a component of the global transitional belt of the east monsoonal humid areas sys… |
| 收稿时间： | 5 March 2005 |
| 修稿时间： | 23 November 2005 |
Geophysical survey on the tectonic and sediment distribution of Qinghai Lake basin |
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| Authors: | AN Zhisheng WANG Ping SHEN Ji ZHANG Yixiang ZHANG Peizhen WANG Sumin LI Xiaoqiang SUN Qianli SONG Yougui AI Li ZHANG Yechun JIANG Shaoren LIU Xingqi WANG Yong |
| Institution: | 1. Institute of Earth Environment, Chinese Academy of Sciences (CAS), Xi'an 710075, China 2. South China Sea Institute of Oceanology, CAS, Guangzhou 510301, China 3. Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China 4. Institute of Geology, China Earthquake Administration, Beijing 100029, China |
| Abstract: | The intensive geophysical survey of Qinghai Lake reveals the buried depth of lake sediments and their distribution features. The result indicates that there are three important inter- phases of Qinghai Lake sediments: T1 is the rife interphase of the lake, above which sediments are spread all over the lake basin with roughly the same thickness; T5 is the interphase from which the neotectonic sedimentary cycle begins, and its above sedimentary environment is relatively stable; Tg is the base of the lake basin. Five west-northwest (WNW) fault belts defined the tectonic structure of Qinghai Lake basin: the central hunch around Haixin Shan with two subbasins both in its north and south. The thickness of the lake sediments varies at different places, the thickest sediments are found within the two subbasins. According to the depth that the Sparker System can reach, sediment in the northern subbasin is deeper than 560 m, while sediment in the southern subbasin is deeper than 700 m. The correlation between the seismic sequence stratigraph and the lithology of onshore core shows that Qinghai Lake sediments consist of muddy silt, clay silt, silty clay, gravel silty clay, etc. |
| Keywords: | sediment geophysical survey Qinghai Lake |
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