| 班戈错晚第四纪湖泊发育、湖面变化与藏北高原东南部末次大湖期湖泊演化 |
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| 引用本文： | 赵希涛,赵元艺,郑绵平,马志邦,曹建科,李明慧.班戈错晚第四纪湖泊发育、湖面变化与藏北高原东南部末次大湖期湖泊演化[J].地球学报,2011,32(1):13-26. |
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| 作者姓名： | 赵希涛 赵元艺 郑绵平 马志邦 曹建科 李明慧 |
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| 作者单位： | 中国科学院地质与地球物理研究所; 中国地质科学院盐湖资源与环境重点开放研究实验室;中国地质科学院矿产资源研究所;中国地质科学院矿产资源研究所; 中国地质科学院盐湖资源与环境重点开放研究实验室;中国科学院地质与地球物理研究所;陕西省地质调查院;中国科学院青藏高原研究所 |
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| 基金项目： | 中国地质调查局“青藏高原及其周边地区第四纪湖泊环境演变序列和气候变迁”项目(编号: 20313000065) |
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| 摘 要： | 班戈错是因湖面阶段性下降而于晚更新世末期从母湖色林错东部分离出来的小离湖.2003年5-7月,我们对班戈湖沿岸进行了详细的地貌与第四纪地质调查,湖面高程及6条剖面湖岸阶地的水准测量,并采集了沿岸及邻区的湖相沉积物样品进行U系年龄测定.研究结果表明,班戈错湖岸阶地共6级,其中T1为与色林错分离后所形成,T2至T6的拔湖高...
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| 关 键 词： | 藏北高原 班戈错 晚第四纪 末次大湖期 湖泊演化 湖面变化 |
Late Quaternary Lake Development and Denivellation of Bankog Co as well as Lake Evolution of Southeastern North Tibetan Plateau during the Last Great Lake Period |
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| ZHAO Xi-tao,ZHAO Yuan-yi,ZHENG Mian-ping,MA Zhi-bang,CAO Jian-ke and LI Ming-hui.Late Quaternary Lake Development and Denivellation of Bankog Co as well as Lake Evolution of Southeastern North Tibetan Plateau during the Last Great Lake Period[J].Acta Geoscientia Sinica,2011,32(1):13-26. |
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| Authors: | ZHAO Xi-tao ZHAO Yuan-yi ZHENG Mian-ping MA Zhi-bang CAO Jian-ke and LI Ming-hui |
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| Institution: | 1) Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029;2) Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037;3) Shaanxi Institute of Geological Survey,Xianyang,Shaanxi 712000;4) Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100085;5) Open Laboratory of Saline Lake Resources and Environment,CAGS,Beijing 100037 |
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| Abstract: | The Bankog Co is a small lake separated from the eastern part of the Silin Co during the late Late Pleistocene. From May to July, 2003, the authors made a detailed investigation of geomorphology and Quaternary geology along the bank of Bankog Co, which included the leveling survey of lake level levations, the measurement of lake terrace heights along six profiles and the collection of lake deposit samples for U-series dating. The study results show that there are 6 level terraces (T1-T6) along the Bankok Co. Except that T1 was formed after separation from the Silin Co, the heights above the lake level and U-series ages of the other terraces are 11.8~29.8 m and 10.9±1.9~14.8±1.1 ka BP for T2, 32.4~59.8 m and 31.1±2.5 ka BP for T3, 52.4~83.7 m and 36.3±3.1~38.8±3.7 ka BP for T4, 82.2~112.9 m and 35.1±2.9 ka BP for T5, and 121.8~139.8 m and 47.9±3.8 ka BP for T6, respectively. Correspondingly, for the heights of individual terraces of the Silin Co, 9 meters should be subtracted from the heights of the Bankok Co terraces, which is the lake level height difference between the two lakes. The 6 level terraces of the Silin Co and the Bankok Co can be well correlated in the formation time with the 6 level terraces of the Nam Co. In addition, some high lake deposits of the early and middle Late Pleistocene may be found in southeastern North Tibetan Plateau. Therefore, the lake evolution of southeastern North Tibetan Plateau since MIS 5 of the last great lake period can be divided into two stages: the Qiangtang great lake stage of 125~30 ka BP, MIS 5e~MIS 3 and the North Tibetan lake group stage during 30~0 ka BP, MIS 2~1. The former can be further divided into four substages: the Qiangtang great lake substage of 125~96 ka BP, MIS 5e~c, the east Qiangtang lake substage of 96~75ka BP, MIS 5b~a, the retreated great lake substage of 75~37 ka BP, MIS 4~MIS 3a and the remnant great lake substage of 37~30 ka BP, MIS 3a. The latter can be further divided into two substages: the lake salting substage of 30~10 ka BP, MIS 2 and the saline lake forming substage of 10~0 ka BP, MIS 1. The study results also show that, from 1959 to 2003, the lake surface of the Bankog Co was overall rising, reaching up to 1.75 m, although from 1959 to 1973 or a little later, there occurred a process of first falling, then rising and again slight falling, with a fall of 0.25 m, and an accompanied contraction of the lake area. |
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| Keywords: | North Tibetan Plateau Bankog Co Late Quaternary last great lake period lake evolution denivellation |
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