| 西藏札达盆地腹足类组合及生物地层学 |
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| 关键词:Tibet Zanda basin gastropod fossils assemblage Guge Formation Pliocene-early Pleistocene |
| 基金项目:中国地质调查局项目(编号: 1212011087114; 1212010511902)；国家自然科学基金项目(编号: 40572134) |
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| The Assemblage of Gastropod Fossils in Zanda Basin of Tibet and Its Biostratigraphy |
| A number of gastropod fossils were discovered in the 4th lithologic member of Guge Formation within Zanda basin of Tibet, with the identification of an assemblage of Adelinella regularis-Velutinopsi which comprises Adelinella regularis Yü, Velutinopsis spiralis Yü, Radix zandaensis sp. nov and Hippeutis cf.minor (Ping). Based on the distribution characteristics of these gastropod fossils in southwest Tibet, the authors regards them as a biological assemblage located in the intermontane fault basin in northern Himalayas, between the Rhino fossils layer and Unio douglasiae Giiffithet Pidgeon-Unio tschiliensis Sturany layer and with a paleomagnetic age of late Pliocene-Early Pleistocene. Based on a comparison with the existing species of gastropod, the authors hold that the gastropod in the fossil strata in Zanda basin might have lived in a shallow littoral lake environment. The sporopollen reveals that the place where the gastropod in the fossil strata lived was an environment of warm and moist forest-grasslands. Hipparion in the lower gastropods fossil layer in Zanda basin indicates a warm and arid shrub-grassland environment. Consequently, the paleo-climate during the deposition of the Tuolin Formation and Guge Formation experienced a transition from a warm and dry environment to a warm and humid environment. |
| HAN Jian-en,YU Jia,HE Cheng-guang,MENG Qing-wei,ZHU Da-gang,MENG Xian-gang,SHAO Zhao-gang,YANG Chao-bin.2012.The Assemblage of Gastropod Fossils in Zanda Basin of Tibet and Its Biostratigraphy[J].Acta Geoscientica Sinica,33(2):153-166. |
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