地理学报 ›› 2009, Vol. 64 ›› Issue (5): 553-562.doi: 10.11821/xb200905004

• 寒区旱区研究 • 上一篇    下一篇

天山木扎尔特河流域的冰川地貌与冰期

赵井东, 王杰1, 刘时银2   

  1. 1. 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,兰州,730000;
    2. 兰州大学西部环境教育部重点实验室,兰州,730000
  • 收稿日期:2009-01-19 修回日期:2009-03-28 出版日期:2009-05-25 发布日期:2009-05-25
  • 作者简介:赵井东(1976-),男,江苏沭阳人,博士,助理研究员,主要从事第四纪冰川与全球变化研究。 E-mail: jdzhao@lzb.ac.cn
  • 基金资助:

    中国科学院知识创新工程重要方向性项目(KZCX2-YW-301);国家自然科学基金项目(40501007);国家重点 基础研究发展计划项目(2007CB411500);科技部科技基础性工作专项项目(2006FY110200)

Glacial Geomorphology and Glaciations in the Muzhaerte River Valley, Tianshan Mountains

ZHAO Jingdong, WANG Jie1, LIU Shiyin2   

  1. 1. State Key laboratory of Cryospheric Sciences,Cold and Arid Regions Environmental and Engineering Research Institute, CAS,Lanzhou 730000,China;
    2. Key Laboratory of Western China's Environmental Systems (Ministry of Education),Lanzhou University, Lanzhou 730000,China
  • Received:2009-01-19 Revised:2009-03-28 Online:2009-05-25 Published:2009-05-25
  • Supported by:

    Knowledge Innovation Project of Chinese Academy of Sciences,No.KZCX2-YW-301;National Natural Science Foundation of China,No.40501007;National 973 Project,No.2007CB411500;Program of the Ministry of Science and Technology of China,No.2006FY110200

摘要:

木扎尔特河流域位于天山最大现代冰川作用中心托木尔峰的东南坡, 在第四纪冰期与 间冰期气候旋回中, 河谷与山麓带留下了4 套形态清晰的冰川沉积。冰碛地形包含着丰富的 古环境变化信息, 对它们进行研究有助于认识该流域的冰川演化与重建该地区的古环境。应 用ESR 测年技术, 选用石英颗粒中对光照与研磨较敏感的Ge 心作为测年信号, 对该流域的 第三套破城子多列终碛垅及其冰水沉积, 第四套克孜布拉克冰碛剥蚀平原上覆河流相砾石沉 积以及一出露完整的沉积剖面进行测年。结合地貌地层学原理以及其他古环境研究资料进行 综合分析可得出: 河谷中第一套3~4 列终碛垅形成于小冰期; 第二套高大的吐盖别里齐终碛 垅为新冰期冰进产物; 破城子终碛垅沉积于MIS2~4; 克孜布拉克冰碛形成于MIS6。破城子 终碛垅地形及测年结果表明末次冰期冰川作用过程中该处至少存在3 次大的冰进, 可分别对 应于MIS4、MIS3b 与MIS2。MIS2 与MIS3b 时冰川为复合山谷冰川, MIS4 与MIS6 时为山 麓冰川。末次冰期冰川作用过程中, 古木扎尔特冰川长约92~99 km, 克孜布拉克冰期最盛时 的古木扎尔特冰川长约120 km。

关键词: 冰川地貌, ESR 测年, 海洋氧同位素阶段(MIS), 木扎尔特河流域,

Abstract:

The Muzhaerte River Valley is located on the southeastern slope of the Tumur Peak, the largest center of modern glaciation in the Tianshan Mountains of China. Four sets of moraines are well-preserved in the valley and on the piedmont. The landforms contain vital information about the variation of the palaeo-environment, and studies on them make it easy to understand the change of ancient glaciers and to reconstruct the palaeo-environment in this region. Electron spin resonance (ESR) dating of a well-exposed section, end moraines and associated outwashes, fluvial sediments on the Kezibulake moraines were carried out using Ge centers in quartz grains, which are sensitive to the sunlight and grinding. Considering the principles of geomorphology and stratigraphy and the available data of the palaeo-environment, some conclusions can be drawn as follows: the first set of moraines, consisting of 3-4 end moraines, were deposited in Little Ice Age; the Tugaibieliqi end moraine was the sediment of the Neo-glacial; the Pochengzi end moraines and the Kezibulake moraines were determined to deposit in the last glaciation and in MIS6. The Pochengzi end moraines and their dates demonstrate that at least three large glacial advances occurred during the last glaciation, corresponding to MIS4, MIS3b and MIS2, respectively. Furthermore the result shows that the glaciers were compound valley ones in MIS2 and MIS3b, while they were piedmont ones in MIS4 and MIS6. The length of the ancient Muzhaerte glacier was about 92~99 km during the Pochengzi glaciation and about 120 km during the Kezibulake glaciation.

Key words: glacial geomorphology, ESR dating, marine oxygen isotope stage, Muzhaerte Rive, Tianshan Mountain