西藏南部定日、聂拉木地区早-中侏罗世有孔虫  

EARLY AND MIDDLE JURASSIC FORAMINIFERA FROM TINGRI AND NYALAM REGIONS OF SOUTHERN TIBET,CHINA

作　　者：蔡华伟[1] 李建国[1] 章炳高[1] 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008

出　　处：《古生物学报》2006年第4期437-452,共16页Acta Palaeontologica Sinica

基　　金：中国科学院资源环境领域创新工程重大项目(KZCX2-SW-129);中国科学院国际合作重点项目(GJHZ0522)资助课题

摘　　要：记述早、中侏罗世有孔虫13属17种,标本采自西藏南部定日县的卧龙剖面及聂拉木县中尼公路5264km路标处剖面。早侏罗世普普嘎组以产大有孔虫为特征,在卧龙剖面仅有下侏罗统的中、上部,缺失下部地层;中侏罗世聂聂雄拉组以产小有孔虫为特征,基本没有大有孔虫。Summary The Lower and Middle Jurassic strata in southern Tibet, China were named the Pupuga and Niehnieh Hsiungla formations respectively. The stratotypes are located on the north of Derirong Bridge, the west side of the road from China to Nepal （Text-fig. 1）. The fossils found in the Pupuga and Niehnieh Hsiungla formations include ammonites, bivalves, corals and foraminifera. The samples of Jurassic foraminifera studied in this paper were collected from two localities of southern Tibet. One is Wǒlong section in Tingri County, and the other is in Nyalam County, which is beside the road sign 5264th km of the road from China to Nepal. It was called 5264th section for short. Ammonites were not found in the Wǒlong section. But abundant foraminifera were collected. Especially some larger foraminifera were found in the lower part of the section. They are Nautiloculina oolitheca Mohle （K1-6, 12, 18）. Ammobaculites tibeticus sp. nov. （K1-6, 21）, Lituolipora termieri （Hottinger） （K1- 12）, Labyrinthina compressa （Hottinger） （ K1-14）, Orbitopsella praecursor （ Gtimbel） （K1-3, 6）, Amijiella amiji （Henson） （K1-24）, Haurania deserta Henson （Kl-17） and Pseudocyclammina liasica Hottinger （K1-18, 21）. The fossils Amijiella amiji and Hanrania deserta might range from Late Sinemurian to Bajocian/Bathonian in age, but they appear frequently in the Middle Liassic. It is well-known that Orbitopsella praecursor , Lituolipora termieri , Pseudocyclammina liasica and Labyrinthina compressa are all typical fossils of Middle Liassic stage. Thus, the age of the above larger foraminifera undoubtedly belongs to the Middle Liassic stage. In the 5264th section the larger foraminifera are found only in the lowermost part of the section. They are Amijiella amiji （Henson）, Haurania deserta Henson and Socotraina serpentina Banner et al. in the sample N-2, and Ammobaculites tibeticus sp. nov. and Amijiella amiji （Henson） in the sample N-4. No typical Middle Liassic foraminifera were foun

关 键 词：大有孔虫 小有孔虫 早、中侏罗世 定日、聂拉木地区 西藏 

分 类 号：Q915[天文地球—古生物学与地层学]