西藏阿里札达盆地上新世—早更新世河湖相地层的重新厘定与划分  

Redefinition and redivision of the Pliocene-early Pleistocene lacustrine strata in Zanda basin, Ngari, Tibet, China

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

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]西藏国土资源厅,西藏拉萨850000

出　　处：《地质通报》2005年第12期1111-1120,共10页Geological Bulletin of China

基　　金：中国地质调查局项目<青藏高原第三纪重点古湖泊环境演变序列>(任务书编码:科眼2003演007-02;工作项目编码:200313000066)的阶段性研究成果。

摘　　要：通过对札达盆地河湖相地层的野外地质调查和剖面实测,对分布于盆地内的新近系上新统—第四系下更新统地层进行了详细的研究和划分,重新厘定了该区上新世—早更新世岩石地层单元,建立了生物地层和年代地层层序。首次提出了该区上新统—下更新统三分方案,将该套河湖相地层重新划分为第四系下更新统香孜组(Qp1-1x)、新近系上新统古格组(N22g)和上新统托林组(N21t)3个组、7个沉积相、11个岩性段,并为确定上新统与下更新统的界线位置提出了具体意见,为青藏高原乃至全球新近系上新统与第四系的研究、划分提供了重要依据。The Neogene Pliocene-Quaternary early Pleistocene strata have been studied and divided in detail, the Plioceneearly Pleistocene lithostratigraphic units have been redefined and the biostratigraphic and chronostratigraphic successions have been established through field geological surveys and section measurements of fluvio-lacustrine strata in the Zanda basin. A threefold division scheme of the Pliocene-lower Pleistocene has been proposed for the first time. This sequence of fluvio-lacustrine deposit has been redivided into the Quaternary early Pleistocene Qangzê Formation （Qp^1-1x）, Neogene Pliocene Guge Formation （N2^2g） and Neogene Pliocene Tolin Formation （N2^1t）, seven sedimentary facies and eleven lithologic members. In addition, a concrete opinion for the determination of the location of the Pliocene-early Pleistocene has been put forward. This study provides an important basis for the study and division of the Neogene Pliocene-Quaternary early Pleistocene on the Qinghai-Tibet Plateau and even in the world.

关 键 词：西藏札达 上新世-早更新世 岩石地层 生物地层 年代地层 

分 类 号：P534.622[天文地球—古生物学与地层学] P534.631[天文地球—地质学]