西藏南部早白垩世瓦兰今期放射虫  

EARLY CRETACEOUS VALANGINIAN RADIOLARIANS FROM THE SOUTHERN XIZANG (TIBET)

作　　者：吴浩若[1] 许波[2] 杨群[2,3] WU Haoruo;XU Bo;YANG Qun(Institute of Geology and Geoph.ysics.Chinese Academy of Sciences,Beijing 100029,China;Slate Key Laboralory of Palueobiology and Stratigra phy.Nanjing Institute of Greology and Palaeonlology and Center for Ercellence in Life Evolution and Emironment.Chinese Academy of Sciences,Nanjing 210008.China;College of Earth and Planetary Sciences,University of Chinese Academyof Sciences,Beijing 100049.China)

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国科学院南京地质古生物研究所现代古生物学与地层学国家重点实验室中国科学院生命与环境卓越创新中心,南京210008 [3]中国科学院大学地球科学学院,北京100049

出　　处：《微体古生物学报》2021年第1期48-62,共15页Acta Micropalaeontologica Sinica

基　　金：科技部基础性工作专项(2013FY113000);中国科学院先导专项(XB26010200)资助。

摘　　要：放射虫Cecrops septemporatus带在世界各地的瓦兰今阶广泛分布,中国最早在上世纪八、九十年代发现于藏南日喀则地区雅鲁藏布蛇绿岩南侧的下鲁硅岩中。本文对相关样品(80-141)进行再研究,描述放射虫18属23种,包括3个新种。该放射虫组合具有Aurissaturnalis variabilis variabilis(Squinabol),Thanarla elegantissima(Cita),Pantanellium corriganensis Pessagno等重要带化石,可与江孜地区混杂堆积和泽当地区蛇绿混杂岩的硅质岩中发现的相关组合及国际同类放射虫生物带进行比较,为全面认识该时期全球放射虫组合面貌及区域对比提供新的证据。The radiolarian Cecrops septemporatus Zone is widespread in the Valanginian strata worldwide, reported from the Xialu chert on the southern side of the Yarlung Zangbo ophiolite belt in Xigaze area, southern Tibet in 1980 s and 1990 s. We here report one well-preserved radiolarian assemblage from sample 80-141 of Wu(1993), with systematic descriptions of 23 species of 18 genera, including 3 new species. The assemblage contains distinctive zonal taxa such as Cecrops septemporatus(Parona), Aurissaturnalis variabilis variabilis(Squinabol), Thanarla elegantissima Cita and Pantanellium corriganensis Pessagno, correlatable with coeval radiolarian assemblages from mélanges in Gyangze and Zedang areas, and with equivalent international radiolarian strata, thus providing new data for establishing the global Lower Cretaceous radiolarian zonation.

关 键 词：放射虫 下鲁硅岩 宗卓组 瓦兰今期 早白垩世 西藏 

分 类 号：Q915[天文地球—古生物学与地层学]