西藏西部札达盆地早更新世香孜组沉积特征和时代——对青藏高原第四系底界的约束  

Sedimentary characteristics and age of the early Pleistocene Qangzê Formation in the Zanda basin, western Tibet, China: Constraints on the lower boundary of the Quaternary of the Tibet-Qinghai Plateau.

作　　者：孟宪刚[1] 朱大岗[2] 邵兆刚[2] 杨朝斌[3] 韩建恩[2] 余佳[2] 孟庆伟[2] 

机构地区：[1]中国地震局地质研究所,北京100029 [2]中国地质科学院地质力学研究所,北京100081 [3]西藏自治区国土资源厅,西藏拉萨850000

出　　处：《地质通报》2005年第6期536-541,共6页Geological Bulletin of China

基　　金：中国地质调查局国土资源调查项目<青藏高原第三纪重点古湖泊环境演变序列>(任务书编码:科[2003]007-02;工作内容编码:200313000066)资助。

摘　　要：通过对西藏札达盆地及其周缘的野外地质调查,填绘出了大面积分布的早更新世早期香孜组冰缘区河湖相沉积。对该河湖相沉积的岩石、结构构造、沉积环境、所含化石特征和形成时代等的研究表明,它是第四纪冰期冰缘区的最早沉积记录,也是第四纪冰期的下限。为青藏高原建立气候地层层序、第四纪冰期划分对比提供了重要的实际资料和依据。According to a field geological study of the Zanda basin and its surrounding areas, Tibet, widespread fluvial-lacustrine deposits in the epiglacial area of the earliest Pleistocene Qangzê Formation have been found and mapped. Studies of the petrology, textures and structures, depositional environment, contained fossils and age of the fluvial-lacustrine deposits indicate that they are the earliest record of the epiglacial area of the Quaternary glacial period, representing the lower boundary of the Quaternary glacial period. This discovery provides important data and evidence for establishing the climatic stratigraphic sequence and division and correlation of the Quaternary glacial period on the Qinghai-Tibet plateau.

关 键 词：早更新世 香孜组 冰缘期 第四纪冰期 西藏札达盆地 

分 类 号：P534.631[天文地球—第四纪地质学]