南海北部琼东南盆地崖北凹陷渐新世沟鞭藻类  

OLIGOCENE DINOFLAGELLATE IN THE YABEI SAG,QIONGDONGNAN BASIN,NORTHERN SOUTH CHINA SEA

作　　者：祝幼华[1] 覃军干[2] ZHU Youhua;QIN Jungan(State Key Laboratory of Palaeobiology and Straligraphy.Nanjing Insitute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment.Chinese Academy of Sciences,Nanjing 210008.China;CN0OC Energy Technology&Services Oil Field Engineering Research Institute,Drilling&Prod uction Zhanjiang,Zhanjiang 524057,China)

机构地区：[1]现代古生物学和地层学国家重点实验室中国科学院南京地质古生物研究所和生物演化与环境卓越创新中心,南京210008 [2]中海油能源发展股份有限公司工程技术湛江分公司,湛江524057

出　　处：《微体古生物学报》2021年第1期84-92,共9页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金(41272014)资助成果。

摘　　要：本文选取南海北部琼东南盆地崖北凹陷Y-2-X井2 197.6~4 288.5 m井段60个样品进行了沟鞭藻化石分析,结果每个样品均发现了沟鞭藻化石,共鉴定34属60种。根据沟鞭藻分布特征,对研究井段的地层进行了划分。2 197.6~2 548.1 m井段,沟鞭藻化石稀少,未建立组合。2 709.7~4 288.5 m建立了2个沟鞭藻组合,其中上部2 709.7~3 304.0 m为Homotryblium plectilum-Cordosphaeridium gracile组合,下部3 304.0 m~4 288.5 m为Homotryblium tenuispinosum-Hystrichokolpoma rigaudiae组合。依据组合特征和标志种,并与邻区沟鞭藻组合进行对比,探讨了组合的地质时代,认为上部组合的时代为晚渐新世,下部组合的时代为早渐新世。A total of 60 samples were collected for dinoflagellate analysis from the interval 2 197.6~4 288.5 mof Well Y-2-X,in the Yabei Sag,Qiongdongnan Basin,Northern South China Sea.60 species attributable to 44 genera were identified.Based on the vertical distribution of the dinoflagellate within Well Y-2-X,and compared with the established assemblages in the adjacent area,two dinoflagellate assemblages were identified.The upper 2 709.7~3 304.0 mis Homotryblium plectilum-Cordosphaeridium gracile assemblage and the lower 3 304.0~4 288.5 mbelongs to Homotryblium tenuispinosum-Hystrichokolpoma rigaudiae assemblage.The results obtained suggest the Late Oligocene age for the upper assemblage and the Early Oligocene for the lower assemblage.

关 键 词：沟鞭藻类 渐新世 崖北凹陷 琼东南盆地 南海北部 

分 类 号：Q913.84[天文地球—古生物学与地层学]