亚洲中纬度地区第四纪冰川作用差异性探讨  

Discussion on difference of Quaternary glaciation in the mid-latitude regions of Asia

作　　者：张威[1] 于治龙[1] 李媛媛[1] 贺明月[1] 

机构地区：[1]辽宁师范大学城市与环境学院,辽宁大连116029

出　　处：《干旱区地理》2014年第3期407-418,共12页Arid Land Geography

基　　金：国家自然科学基金项目(41271093;40971010;41230743)

摘　　要：近年来,随着绝对年代的不断增加,第四纪冰川作用的启动时间以及演化特点日益明确,为探讨中纬度地区的冰川的形成机制提供了重要依据,同时也为研究中国第四纪冰川发育的构造与气候耦合关系奠定了重要基础。亚洲中纬度地区山地第四纪冰川的冰进时序、冰期历史和冰川规模显示出不同特点。总体来说,西部山地的冰川规模随时间逐渐缩小,冰川历史较为完整,冰川规模大于亚洲东部,东部山地的冰期历史较短,冰川作用的阶段性明显;不同地区的最大冰川扩展规模在时间上不一致,尤其是在末次冰期旋回中,MIS3/4阶段的冰川规模大于传统意义上的末次冰盛期(LGM),冰进时序和规模演化指示了不同的大气环流尤其是西风环流和季风环流对冰川发育的重要影响。此外,构造因素深刻影响着不同地区的冰期系列。Chinese glacial history is definitely different from the glacial history of Polar region and the high latitudes through the research of the glacial history,distribution characteristics and extent evolution,especially in the Tibetan Plateau and its bordering mountains. The possible reason may be that the tectonic uplift of the Tibetan Plateau is late. In recent years,as the development of the research in the absolute chronology,onset of the Quaternary glaciations and the evolution characteristics become more and more clear. It is not only provides the important basis for discussing the glacier mechanism in middle latitudes,but also vitally important for researching the coupling control on the Quaternary glaciation between climate and tectonic movement in China. Previous studies possibly show that there are different characteristics among the Quaternary glacial sequence,history and extent in middle latitudes of Asia. The real material includes the absolute dating results such as the TL,ESR,CRN and 14C,glacial extent,and other climate and/or tectonic uplift collected in the research regions located in the central Asia,including Tianshan Mountains across China and Kazakhstan,Altai Mountains,Qilian Mountains,Helan Mountains,Taibai Mountains,Changbai Mountains and the mountains in Japan. The comparison was carried out of glacial series,extent evolutions and influence factors on the differences of glacial development in these mountains. The main conclusions are as follows：the glacial extent becomes gradual reduction in the western mountains with time advance and the glacial history in the western Tianshan Mountains stared at the MIS 6 stage is shorter than that in the eastern Tianshan Mountains and the Qilian Mountains with a longer glacial history at the beginning of the Zhonglianggan Glaciation （～470 ka）. In contrast,the glacial history only stared at the last glacial cycle （～75 ka） is much shorter in and along the islands near the Pacific Ocean and in East Asia. Studies also show that the largest glacia

关 键 词：亚洲 中纬度 冰期历史 冰川规模 差异 

分 类 号：P343.6[天文地球—水文科学]