塔里木盆地库车坳陷小库孜拜剖面古近纪钙质超微化石  

PALAEOGENE CALCAREOUS NANNOFOSSILS FROM THE XIAOKUZIBAI SECTION OF THE KUQA DEPRESSION,TARIM BASIN

作　　者：祝幼华[1] 赵媛媛[1] 钟石兰[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》2012年第3期328-333,共6页Acta Palaeontologica Sinica

基　　金：国家自然科学基金(40372005)资助

摘　　要：小库孜拜剖面位于塔里木盆地库车坳陷西部,是库车坳陷海相古近系的代表性剖面。通过对该剖面36块样品钙质超微化石的分析和研究,在4个样品中发现了稀少的钙质超微化石,共鉴定2属4种及1个未定种,分别为Micrantholithus attenuatus,M.crenulatus,M.sp.,Braarudosphaera bigelowii和B.discula等。化石组合的显著特征是属种单调,丰度和分异度都极低。标本受到严重溶蚀,保存状态较差。根据化石组合特征及标志化石的分布时代,推测含化石的地层时代为晚古新世至早始新世。所见化石属种均为浅海近岸钙质超微组合的重要分子,认为该时期小库孜拜一带的古环境处于海湾近岸地带。The Xiaokuzibai section is located in the western part of the Kuqa depression within the Tarim Basin. In this paper 36 samples have been examined for calcareous nannofossils from the section.Calcareous nannofossils were found in only four samples and were of low abundance and diversity.Nonetheless four identifiable and one indeterminable species in two genera were observed： Micrantholithus attenuatus, M. crenulatus, M. sp. ,Braarudosphaera bigelowii and B. discula. These indicate the age of the strata to have been in the range of Late Palaeocene to early Eocene. Such fossils are an important component of shallow water inshore, suggesting that the palaeoenvironment of this period may have been in the nearshore zone of what was then a gulf.

关 键 词：钙质超微化石 小库孜拜剖面 古近纪 库车坳陷 塔里木盆地 

分 类 号：Q911[天文地球—古生物学与地层学]