摘要
前人曾经提出青藏高原早更新世存在一次大冰期,但苦于未找到冰碛层而未曾被人们重视。本次《康西瓦》、《恰哈》、《岔路口》、《阿克萨依湖》四幅1∶25万区域地质调查项目,2003年在《岔路口》幅天文点—乔尔天坦一带野外地质调查工作中,首次发现了早更新世冰碛层,其分布特征与现代地形地貌无直接关系,说明该期冰碛层形成之后,地壳还发生了差异隆升。该冰碛层的发现对确定青藏高原早更新世冰期的存在,提供了直接的证据,对研究青藏高原"大冰盖"和"统一大湖"学说提供了可靠的资料,对进一步研究大陆动力学及地壳构造演化具有重要意义。
The existence of an Grate glacial in Tibet of Eopleistocence has been raised by some people, but this theory hash＇ t been paid attention for no discover of glacial deposit Through the 1 ： 250000 regional geological survey in the project of ＂Kangxiwa Qiaha＂ ＂Chalukou＂ ＂Akesayi Lake＂, first time , we found Eopleistocence drift deposit in the area of Tianwentai-Qiaortiantan in 2003. The distribution feature of the drift deposit has no rela- tionship with present land form, which indicates Earth crust occurred with differential uplift movement after the formation of this glacial deposit. The discovery of the drift deposit furnish direct evidence to the existence of Eopleistocence glaciation in the Tibet plateau, offerring reliable information for research of ＂Grate Ice Sheet＂ and ＂Universal Grate Lake＂ theory of Tibet plateau and has important significance to further research of land dynamics and crust tectonic evolution.
出处
《陕西地质》
2009年第2期48-52,共5页
Geology of Shaanxi
基金
<康西瓦>
<恰哈>
<岔路口>
<阿克萨依湖>四幅1:25万地质调查项目
