塔里木盆地吐依洛克组发现沟鞭藻化石  

Discovery of Dinoflagellates from the Tuyiluoke Formation in Tarim Basin

作　　者：郭宪璞[1] 王大宁[1] 丁孝忠[1] 叶留生[2] 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]中国石化石油勘探开发研究院西部分院,乌鲁木齐830001

出　　处：《地质论评》2008年第6期814-820,I0003,共8页Geological Review

基　　金：国家重点科技攻关项目(编号:96-111-02-01-01,99-111-01-02-07);中石化前瞻性及基础性项目(编号:W2704-4);国家地质调查局资助项目(编号:1212010611702)的成果

摘　　要：新疆塔里木盆地西南缘的吐依洛克组化石罕见,以前依据岩性将其定为晚白垩世。郝诒纯等(2001)、郭宪璞(1990)根据在该组所产的有孔虫、介形虫等化石组合,将该组时代划为古新世,并将白垩系与古近系界线划在该组与依格孜牙组之间。本次在该组命名剖面—吐依洛克剖面上部岩性段发现了20余种沟鞭藻化石,增添了新的古生物门类和生物地层材料,这是带有白垩纪与古近纪过渡色彩的沟鞭藻化石组合,其所反映的古环境是温暖的近岸滨海—浅海环境。The naming section of the Tuyiluoke Formation is located in the Tuyiluoke Village, about 50 km southeast of the Yingjisha County, Xinjiang. The Tuyiluoke Formation is obviously divided into two members. The lower member consists mainly of grey-yellow , grey-red conglomerate , interbedded with sandstones , about 10m in thickness. And the upper member mainly of brownish-red argillaceous sandstones , about 10m in thickness, interbedded with gypsum and 3 beds of grey-greenish sandymudstones. Writers found dinoflagellates fossils （sample No. T2）in the 2na bed of the grey-greenish sandymudstones. The Tuyiluoke Formation, as one of the most important sedimentrelated to the boundary of the Cretaceous and Paleocene in the Tarim Basin, has long been regarded as Cretaceous, in which fossils is rather rare. According to the assemblages of foraminifera and ostracoda, the age of this Formation has been assigned into the Paleocene, and the boundary of Cretaceous and Paleocene has been fixed between the Tuyiluoke Formation and the Yigezya Formation by Hao Yichun et al. （2001） and Guo Xianpu （1990）. In this time, because the key fossils are not typical, the dinoflagellates fossils in this Formation are characterized by transitional assemblage between the Cretaceous and Paleocene. This assemblage reflects a warm littoral--shallow sea environment.

关 键 词：沟鞭藻化石 吐依洛克组 塔里木盆地 

分 类 号：Q914[天文地球—古生物学与地层学]