Ostracoda Biostratigraphy Of Paleogene In Tüna,Yadong, Tibet

Qinghai-Tibet Plateau, known as “The Roof of the World”, is located in south of the Asian continent. Due to its unique natural environment and complex crustal structure, it has attracted a lot of geologists in domestic and abroad to learn and explore for a long time. The collision between the Eurasian plate and the Indian Ocean plate is usually regarded as the vitally important factor to lead to the uplift of the Qinghai-Tibet Plateau. The collision is continuous process which hasn’t left visible geological records. Therefore, we need to use the geological records when collision happened to infer the lower and upper limit of the collision time and then gradually narrow the interval to infer the possible time of the collision.The main purpose of this essay is to infer the final closing time of the Tibetan Tethys by the way of micropalaeontological stratigraphy, which can constraint the possible latest time of the collision between the Indian Ocean plate and the Eurasian plate.A detailed investigation on ostracods was firstly provided for the new discovered marine strata(Palaeogene Zhepure Formation)at Gulupu section, Tüna, Yadong, southern Tibet.Based on the analysis and research on the sand-shale ostracods fossil of the Zhepure Formation in Gulupu, Tüna, Yadong, southern Tibet, 36 species of 18 genus were identified and three ostracod assemblages are recognized in ascending order: ①Alocopocythere curvata-Cytherella compressa, ②Bairdia fabaeformis-Monsmirabilia subovata, ③Bairdia dignata-Bairdia lauta. The ostracods retrieved from the Shale Member provide it an Eocene age.