新疆库鲁克塔格地区中奥陶统黑土凹组的放射虫新属种  

NEW RADIOLARIAN GENERA AND SPECIES OF HEITUAO FORMATION(ORDOVICIAN) IN THE KURUKTAG REGION,XINJIANG

作　　者：王玉净[1] 成俊峰[1] 张元动[1,2] 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008 [2]现代古生物学和地层学国家重点实验室,南京210008

出　　处：《古生物学报》2008年第4期393-404,共12页Acta Palaeontologica Sinica

基　　金：中国科学院知识创新工程方向性项目(KZCX2-YW-122);科技部基础性工作专项(2006FY120300-4)资助

摘　　要：新疆库鲁克塔格地区的奥陶系黑土凹组黑色硅质岩中发现丰富的放射虫动物群,以泡沫虫类球形放射虫最多,不具外刺和具外刺的Inaniguttidae科占优势,及一些分类位置待定的特殊放射虫族群。本文描述该动物群中4个新属Quasibeothuka,Batoballa,Protosegmentum和Tetrasphaera,10个新种(Quasibeothuka fusiforma,Q.ovata,Q.ellipsoidala,Q.longifusiforma,Q.bithornya,Batoballa communis,B.longiovata,Protosegmentum xinjiangensis,Tetrasphaera kuruktagensis,Beothuka longispiniforma)。黑土凹组的放射虫动物群拟建立Tetras-phaerakuruktagensis带,下分二个亚带,下部的Protosegmentum xinjiangensis亚带和上部的Quasibeothuka fusi-forma亚带。该组的黑色页岩中产Exigraptus clavus带笔石化石,时代为中奥陶世大坪期。该组很可能是一个很好的生油层。A rich radiolarian fauna is discovered in the Tetrasphaera kuruktagensis, Beothuka longispin- iforma） are described . Associated with the fauna includes graptolites of the Exigraptus clavus Biozone, which were found from the black shale of this formation, indicating Dapingian age （Middle Ordovician）. Based on the radiolarian fauna, Tetrasphaera kuruktagensis Biozone is identified, which includes two subzones, a lower Protoseg- mentum xinjiangensis Subzone and an upper Quasibeothuka fusiforma Subzone. This formation may be considered as a potential hydrocarbon source rock.

关 键 词：放射虫 黑土凹组 烃源岩 大坪阶 奥陶系 新疆 

分 类 号：Q915[天文地球—古生物学与地层学]