西藏阿里札达盆地上新统鼠兔类牙齿化石的发现  

Discovery of fossil teeth of Pliocene Ochotona in the Zanda basin, Ngari, Tibet, China

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]西藏国土资源厅,西藏拉萨850000

出　　处：《地质通报》2005年第12期1175-1178,共4页Geological Bulletin of China

基　　金：中国地质调查局国土资源大调查项目"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：首次在西藏阿里札达盆地上新世河湖相沉积地层中发现了鼠兔类牙齿化石,对鼠兔类牙齿化石的基本特征进行了描述,并在同一层位中采集了大量孢粉、古动物和古植物化石。结合区域地质特征,产出鼠兔类牙齿化石地层的古地磁、ESR测年资料,沉积学特征等的简要分析,认为札达盆地鼠兔类的]化迁徙与上新世时气候由温暖湿润向寒冷潮湿—温和干旱的变化有关。显然,这一发现有助于认识青藏高原新近纪上新世的生物]化、气候变化和构造活动,并为研究青藏高原新近纪以来的生物进化、湖泊与河流]化、气候变化、古地理与古环境变迁和古近系、新近系、第四系地层划分等提供了新资料。Recendy Ochotona tooth fossils have been for the first time discovered in Phocene fluvio-lacustrine sediments in the Zanda basin, Ngari, Tibet. Their basic features are described. In addition to the Ochotona tooth fossils, large quantities of sporopollen, Dicerorhininae, microfossils and plant fossils have been collected in the same horizon. On the basis of studies of the Ochotona fossils, combined with the regional geology and paleomagnetic and ESR dating data and sedimentological features of the strata where the rhinoceros fossils occur, the authors think that the evolution and migration of Ochotona in the Zanda basin were related to the chmatic change from warm-humid to cold-humid and warm-dry during the Phocene. The evolution and migration of rhinoceros were thoughtfully noted in the Zanda basin. It is evident that this discovery may help us understand the Pliocene organic evolution, climatic change and tectonic movement in the Qinghai-Tibet Plateau and provide new data for the study of the organic evolution, lake and river evolution, climatic change, paleogeographic and the paleoenvironment changes and stratigraphic division of the Paleogene, Neogene and Quaternary.

关 键 词：鼠免类化石 上新统 西藏阿里地区 

分 类 号：P534.622[天文地球—古生物学与地层学] Q915.86[天文地球—地质学]