STUDY ON THE ICE AGE MIS_(12) IN WESTERN CHINA
STUDY ON THE ICE AGE MIS_(12) IN WESTERN CHINA
复制标题
DOI：
--
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
Zhou Shang-zhe
中科院分区：
文献类型：
--
作者：
Zhou Shang-zhe
测年是第四纪冰川作用研究中的一个非常关键的问题。近年来，人们利用OSL（光学模拟发光）、AMS（加速质谱）、ESR（电子自旋共振）等技术对冰川沉积物进行测年。祁连山是青藏高原东北缘山脉，天山是亚洲中部的大山。这两座山位于亚洲温带干旱地区。但由于高海拔地区降水适宜，两山内存在大量当代冰川。冰川沉积和地貌表明，这些冰川在第四纪时期发生较早，并曾多次推进。采用 ESR 技术来确定两座山的冰川作用和相关沉积物沉积的时间。祁连山白浪河流域中梁干顶部最古老的冰碛（海拔2997m，海拔500m）距今462^9ka。乌鲁木齐河流域天山最古老的高瓦峰沟（海拔 3450m，海拔 250m）距今 477.1ka BP 和 459.7ka BP。这些年代测定表明，这两座山的冰川在海洋同位素第 12 阶段（MIS 12）期间延伸，暗示了隆起的山脉对全球气候恶化的反应。
The dating is a very key problem in the study of Quaternary glaciation. Recent years, many technologies,for example,OSL (optically simulated luminescence),AMS (accelerating mass spectrometry), ESR (electron spin resonance) and so on, were used to date glacial deposits. Qilian Shan mounatains is the northeastern marginal mountains of the Qinghai-Tibetan Plateau and Tian Shan mountains is the big mountains in the center of Asia. The two mountains lie in the temperate arid region of Asia. However, because of appropriate precipitation in high attitude, there are a lot of contemporary glaciers in the two mountains. The glacial deposits and geomorphologies indicate that those glaciers occurred early and advanced for several times during Quaternary period. ESR technology was undertaken to define the timing of the glaciations and associated sediment deposition of the two mountains. The oldest moraine on the top of Zhonglianggan (2997m asl and 500m above the contemporary river level) in Bailang River Basin of Qilian Shan mountains was dated 462\^9 ka BP. The oldest high Wafeng till (3450m asl and 250m above contemporary river level) of Urumqi River Basin, Tian Shan, was dated 477.1ka BP and 459.7ka BP.These datings show that the glaciers of the two mountains extended during marine isotopic stage 12(MIS 12) and implicate a response of the uplifted mountains to the global climatic deterioration.