| High-Resolution Records of the Holocene Paleoenvironmental Variation Reflected by Carbonate and Its Isotopic Compositions in Bosten Lake and Response to Glacial Activities |
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| 作者姓名： | ZHANG Chengjun ZHENG Mianping Alexander PROKOPENKO Steffen MISCHKE GOU Xiaohui YANG Qili ZHANG Wanyi and FENG Zhaodong |
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| 作者单位： | 1 School of Resources and Environmental Sciences, Lanzhou University, Lanzhou 730000, Gansu, China; 2 Center of Saline Lake and Epithermal Deposit, Chinese Academy of Geological Sciences, Beijing 100037, China; 3 University of South Carolina, Columbia, SC, 29205, USA; 4 Freie University Berlin, Berlin, 12249, Germany |
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| 基金项目： | This work was co-supported by the National Natural Science Foundation of China (grant Nos. 40773064，40331012 and 40041004) and “973” Program of China (No. G1999043501). |
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| 摘 要： | Abstract: The Early Holocene paleoclimate in Bosten Lake on the northern margin of the Tarim Basin, southern Xinjiang, is reconstructed through an analysis of a 953 cm long core (BSTC2000) taken from Bosten Lake. Multiple proxies of this core, including the mineral components of carbonate, carbonate content, stable isotopic compositions of carbonate, Ca/Sr, TOC and C/N and C/S of organic matter, are used to reconstruct the climatic change since 8500 a B.P. The chronology model is made by nine AMS 14C ages of leaves, seeds and organic matter contained in two parallel cores. The climate was cold and wet during 8500 to 8100 a B.P. Temperature increased from 8100 to 6400 a B.P., the climate was warm and humid, and the lake expanded. The lake level was highest during this stage. Then from 6400 to 5100 a B.P., the climate became cold and the lake level decreased slightly. During the late mid-Holocene, the climate was hot and dry from 5100 to 3100 a B.P., but there was a short cold period during 4400 to 3800 a B.P. At this temporal interval, a mass of ice and snow melting water supplied the lake at the early time and made the lake level rise. The second highest lake level stage occurred during 5200 to 3800 a B.P. The climate was cool and wet during 3100 to 2200 a B.P., when the lake expanded with decreasing evaporation. The lake had the last short-term high level during 3100 to 2800 a B.P. After this short high lake level period, the lake shrank because of the long-term lower temperature and reduced water supply. From 2200 to 1200 a B.P., the climate was hot and dry, and the lake shrank greatly. Although the temperature decreased somewhat from 1200 a B.P. to the present, the climate was warm and dry. The lake level began to rise a little again, but it did not reach the river bed altitude of the Konqi River, an outflow river of the Bosten Lake.
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| 关 键 词： | Key words: carbonate isotopic composition glacial activity paleoenvironmental variation Bosten Lake |
| 收稿时间： | 2008/2/26 0:00:00 |
| 修稿时间： | 2008/7/25 0:00:00 |
High-Resolution Records of the Holocene Paleoenvironmental Variation Reflected by Carbonate and Its Isotopic Compositions in Bosten Lake and Response to Glacial Activities |
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| Authors: | ZHANG Chengjun ZHENG Mianping Alex er PROKOPENKO Steffen MISCHKE GOU Xiaohui YANG Qili ZHANG Wanyi FENG Zhaodong School of Resources Environmental Sciences Lanzhou University Lanzhou Gansu China Center of Saline Lake Epithermal Deposit Chinese Academy of Geological Sciences Beijing China University of South Carolina Columbia SC USA Freie University Berlin Berlin Germany |
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| Institution: | [1]School of Resources and Environmental Sciences, Lanzhou University, Lanzhou 730000, Gansu, China [2]Center of Saline Lake and Epithermal Deposit, Chinese Academy of Geological Sciences, Beijing 100037, China [3]University of South Carolina, Columbia, SC, 29205, USA [4]Freie University Berlin, Berlin, 12249, Germany |
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| Abstract: | The Early Holocene paleoclimate in Bosten Lake on the northern margin of the Tarim Basin, southern Xinjiang, is reconstructed through an analysis of a 953 cm long core (BSTC2000) taken from Bosten Lake. Multiple proxies of this core, including the mineral components of carbonate, carbonate content, stable isotopic compositions of carbonate, Ca/Sr, TOC and C/N and C/S of organic matter, are used to reconstruct the climatic change since 8500 a B.P. The chronology model is made by nine AMS 14C ages of leaves, ... |
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| Keywords: | carbonate isotopic composition glacial activity paleoenvironmental variation Bosten Lake |
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