| 阿尔泰山喀纳斯河流域末次冰期OSL年代学新证 |
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| 引用本文： | 江合理,赵井东,殷秀峰,李忠勤,康剑,孙吉舟.阿尔泰山喀纳斯河流域末次冰期OSL年代学新证[J].冰川冻土,2012,34(2):304-310. |
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| 作者姓名： | 江合理 赵井东 殷秀峰 李忠勤 康剑 孙吉舟 |
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| 作者单位： | 西北师范大学地理与环境科学学院,甘肃兰州,730070;中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室,甘肃兰州,730000;西北师范大学地理与环境科学学院,甘肃兰州730070／中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室,甘肃兰州730000;喀纳斯景区管理委员会,新疆布尔津,836600 |
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| 基金项目： | 国家自然科学基金项目，中国科学院知识创新工程重要方向性项目，冰冻圈科学国家重点实验室自主课题，科技部科技基础性工作专项 |
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| 摘 要： | 布尔津河支流喀纳斯河源于中俄蒙三国交界处友谊峰的南坡,为额尔齐斯河的重要源区.友谊峰连同奎屯峰等高峰形成了阿尔泰山最大的现代冰川作用中心.在第四纪期间,这些冰川都发生了规模较大的进退,在河谷中留下了形态较为清晰的冰川地形.应用OSL单片再生剂量测定技术对采自主U型谷两侧的高大侧碛垄进行了定年,测年结果分别为(27.2±2.0)ka(K-1)与(16.1±1.5)ka(K-2).基于地貌地层学原理、并结合已有的年代学资料(OSL与14 C)与古气候研究资料,末次冰期以来喀纳斯河流域共有5次规模较大的冰进,分别为小冰期、新冰期、末次冰期晚冰阶(MIS 2)、末次冰期中冰阶(MIS 3中期)与末次冰期早冰阶(MIS 4).
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| 关 键 词： | OSL测年 冰川地貌 末次冰期 喀纳斯河流域 阿尔泰山 |
New OSL Chronology of the Last Glaciation in Kanas River Valley,Altay Mountains,China |
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| JIANG He-li,ZHAO Jing-dong,YIN Xiu-feng,LI Zhong-qin,KANG Jian,SUN Ji-zhou.New OSL Chronology of the Last Glaciation in Kanas River Valley,Altay Mountains,China[J].Journal of Glaciology and Geocryology,2012,34(2):304-310. |
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| Authors: | JIANG He-li ZHAO Jing-dong YIN Xiu-feng LI Zhong-qin KANG Jian SUN Ji-zhou |
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| Institution: | 1.College of Geography and Environment Sciences,Northwest Normal University,Lanzhou Gansu 730070,China; 2.State Key laboratory of Cryospheric Sciences,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China; 3.Administration of Kanas Scenic Spot,Burgin Xinjiang 836600,China) |
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| Abstract: | The Kanas River originates on the southern slopes of the Youyi Peak,the largest modern glaciation center in the Altay Mountains in China.Glaciers had advanced and retreated dramatically during the glacial-interglacial cycles in the Quaternary.Multiple moraine complexes were preserved in the headwaters of the Kanas River,recording a complex history of Quaternary glacial cycles and landscape evolution.In this study,two fluvioglacial deposits,which collected from the lateral moraines in the main U-shaped valley,were determined by optically stimulated luminescence(OSL) dating technique with single aliquot regenerative-dose(SAR).It is determined that the ages are 27.2±2.0 ka(K-1) and 16.1±1.5 ka(K-2).Based on the principles of geomorphology and stratigraphy,the previous dating results(by 14C,OSL) and the available palaeo-environmental data,five glacial advances have been confirmed in the Kanas River valley since the Last Glaciation.Three glacial advances have appeared during the last glacial cycle,corresponding to MIS 4,mid-MIS 3 and MIS 2.Two glacial advances occurred in the Holocene,which corresponded to Neoglaciation(the largest glacial advance in the last 3~4 ka in West China) and the Little Ice Age(glacial advance in the cold period since the 16th century). |
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| Keywords: | OSL dating glacial geomorphology Last Glaciation Kanas River valley Altay Mountains |
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