| 西藏扎布耶湖ZK91-2钻孔沉积特征与气候环境演化 |
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| 引用本文： | 齐文,郑绵平.西藏扎布耶湖ZK91-2钻孔沉积特征与气候环境演化[J].湖泊科学,1995,7(2):133-140. |
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| 作者姓名： | 齐文 郑绵平 |
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| 作者单位： | 中国地质科学院盐湖与热水资源研究发展中心, 北京 100037,中国地质科学院盐湖与热水资源研究发展中心, 北京 100037 |
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| 基金项目： | 国家自然科学基金(编号:49070123);地矿部重点科研资助项目 |
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| 摘 要： | 扎布耶盐湖位于西藏高原腹地，１９９１年在其南部干盐滩中钻取了２０Ｍ深湖相沉积，以５～１０ＣＭ／个的密度进行高分辨率取样，详细探讨了沉积标志，矿物组合（尤其Ｍｇ，Ｃａ，Ｌｉ碳酸盐）、干旱与潮湿两种气候类型的元素组合等气候环境指标，推导了晚更新世以来该湖区湖面涨缩，水质咸淡及气温高低变化。
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| 关 键 词： | 西藏扎布耶盐湖 岩芯记录 环境 气候 湖相沉积 |
| 收稿时间： | 1994/5/12 0:00:00 |
| 修稿时间： | |
Sedimentary characteristtxcs of zk91-2 core and climate-environment evolution of Zabuye Lake, Tibet Plateau |
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| Qi Wen and Zheng Mianping.Sedimentary characteristtxcs of zk91-2 core and climate-environment evolution of Zabuye Lake, Tibet Plateau[J].Journal of Lake Science,1995,7(2):133-140. |
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| Authors: | Qi Wen and Zheng Mianping |
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| Institution: | Chinese Academy of Geological Sciences, Beijing 100037 and Chinese Academy of Geological Sciences, Beijing 100037 |
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| Abstract: | Zabuye saline lake is situated in the hinterland of Tibet Plateau. In 1991, a core of 20m was drilled up in the southern lake, and 5~10-cm-lorg sampler taken in succession. Valuable studies were performed on the climate-environmental indicator of sedimentary marks, mineral association, and element assemblage, etc. Sedimentary structure, size distribution, and organic materials etc. clearly revealed the fluctuation of water depth and air temperature, and it was consistent with the variation of content of dolomite and calcite. We have also paid special attention to Li-bearing carbonate, borate and mirabilite etc. which are sensitive to salinity and temperature of the lake water and exist commonly in salt lake sediments in Tibet Plateau. Cluster analysis of some elements (Ca, Mg, Sr, K, Na, B, Ba, Li, Fe, Mn, Cr, Co, Ni, V, Ci) in the sediments shows that they can be distinguished into twc parts:some elements (Ca, Mg, Sr, K, Na, B, Li, Ba) accumulate in the sediment during arid period an arid type, and the others concentrate in the sediments during humid period a humid type. It is found that the ratio of the arid type to the humid type is a better indicator of the climate for the sediments in geological era. The study shows that before 2.9×104 a B-P., the old Zabuye Lake was deep and had a vast area, the climate then was cold and a little humid; during 2.9×104~2.2×104a B. P., the climate of the lake area turned warm and humid; from 2.O×104 a B. P. onwards, the climate became dry and cold, the lake water dropped greatly and got salinized; but during 1.3×104~1, 1×104 a B, P., there existed a warm and humid period; from Holocene Epoch onwards, some soluble salt began to deposit, during 6000~4000 a B. P. 5 there was an obvious fluctuation to warm and humid; from then on, the climate was getting dryer and colder. |
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| Keywords: | Xizang(Tibet) Zabuye Lake core records climate and environment |
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