藏南泽当金鲁地区晚侏罗世—早白垩世放射虫  

LATE JURASSIC—EARLY CRETACEOUS RADIOLARIANS FROM JINLU,ZEDONG,SOUTHERN TIBET,CHINA

作　　者：刘实佳 罗辉[1] 许波[1] 王学恒[1,2] 陈迪舒[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]中国科学院大学,北京100049

出　　处：《微体古生物学报》2016年第3期211-228,共18页Acta Micropalaeontologica Sinica

基　　金：中国科学院战略性先导科技专项(B类)(No.XDB03010102);国家自然科学基金青年基金(41402016)联合资助~~

摘　　要：本文系统描述了产自泽当金鲁乡鲁巴垂附近5块硅质岩样品中保存较好的放射虫化石,共20属26种(含未定种),包括Becus triangulocentrum Dumitrica,Cecrops septemporatus(Parona),Cryptamphorella conara(Foreman),Dicerosaturnalis dicranacanthos(Squinabol),Eucyrtidiellum pyramis(Aita),Hiscocapsa verbeeki(Tan),H.uterculus(Parona),Holocryptocanium barbui Dumitrica,Praeconosphaera sphaeroconus(Rüst)和Tethysetta boesii(Parona)等重要分子。通过与西特提斯地区放射虫化石带的对比,可确定这些放射虫化石组合相当于UAZone 13—UAZone 22带,其时代为晚侏罗世提塘晚期—早白垩世阿普特期。有关雅鲁藏布江缝合带东段蛇绿岩体中的放射虫化石目前只有零星的报道,尚缺乏系统的研究。本文所发现的放射虫化石组合可为雅鲁藏布江缝合带东段泽当蛇绿岩体的时限提供重要的时代依据。Moderate preserved 26 radiolarian species belonging to 20 genera collected from a cherty block and one radio- larite sample near the Lubachui village of Jinlu, Zedong Town, Southern Tibet, China were described systematically. They are mainly composed of Becus triangulocentrum Dumitrica, Cecrops septemporatus （Parona）, Cryptamphorella conara （Foreman）, Dicerosaturnalis dicranacanthos （Squinabol）, Eucyrtidiellum pyrarnis （Aita）, Hiscocapsa ver- beeki （Tan）, H. uterculus （Parona） , Holocryptocanium barbui Dumitrica, Praeconosphaera sphaeroconus （Riast） and Tethysetta boesii （Parona）. By compared with the radiolarian zones in West Tethys, these Tibetan radiolarian as- semblages （zones） can be correlated with UAZone 13, UAZone 17 and UAZone 22 respectively, which indicated the chert blockis from upper Jurassic （Tithonian） to lower Cretaceous （Aptian）. Few research works on the radiolarian biostratigraphy has been previously clone in this region. The radiolarians described in this paper will provide an impor- tant evidence for the time constrain on the ophiolite in Zedong, Southern Tibet.

关 键 词：放射虫 生物地层 侏罗纪-白垩纪 雅鲁藏布江缝合带 西藏南部 

分 类 号：Q915[天文地球—古生物学与地层学]