[关键词]
[摘要]
对西藏岗巴盆地层位最高的海相地层——遮普惹组所含介形虫化石进行了分析和研究，共鉴定出22属、33种，建立两个介形虫组合：Paracypris mayaensis sp. nov.-Bairdia zongpuxiensis sp. nov. 组合(下部)和 Phlyctenophora zongpuensis-Semicytherura subsyrnmetros组合(上部)；讨论介形虫组合的特征及其地质时代，并与世界上其它地区有关地层进行对比，结合与之共生的有孔虫组合的时代特征，认为含该介形虫组合的海相地层——遮普惹组的时代应为始新世Ypresian-Priabonian早期。描述6种，其中有2新种：Paracypris mayaensis sp. nov.和Bairdia zongpuxiensis sp. nov.。
[Key word]
[Abstract]
The Zhepure Formation of Gamba stands for the youngest marine sediments in southern Xizang(Tibet). Nine samples containing ostrocods were collected for this study from the upper sand-shale member of the Zhepure Formatiom in Zongpuxi section, Gamba county of southern Tibet. Two Ostracod assemblages are recognized (in ascending order): 1. Paracypris mayaensis sp. nov.-Bairdia zongpuxiensis sp. nov. assemblage, 2. Phlyctenophora zongpuensis-Semicytherura subsymmetros assemblage. The second assemblage is dated as late Lutetian to early Priabonian of Eocene. It indicates that the sea water did not withdraw from the southern Tibet until early Priabonian. Six species, including 2 new species, have been described and illustrated in this paper.
[中图分类号]
Q915.819.6
[基金项目]
国家自然科学基金 (No .40 2 72 0 0 7)，中国地质调查局 1∶2 5万区域地质调查项目 (No .2 0 0 0 13 0 0 0 0 91111)资助课题
