江苏仑山地区和湖北宜昌地区上奥陶统五峰组放射虫动物群  

RADIOLARIA FAUNAS OF THE WUFENG FORMATION (UPPER ORDOVICIAN) AT LUNSHAN,JIANGSU PROVINCE AND YIHUANG-1 WELL,YICHANG,HUBEI PROVINCE,CHINA

作　　者：张照 罗辉[1,3] 张元动 ZHANG Zhao;LUO Hui;ZHANG Yuandong(Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences 39 East Beijing Road,Nanjing,Jiangsu Province.Nanjing 210008;University of Chinese Academy of Sciences,Beijing 1000493）CAS Key Laboratory of Economic Stratigraphy and Palaeogeography,Nanjing Institute of Geology ctnd Palaeontology,Nanjing 210008)

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 [3]中国科学院资源地层学与古地理学重点实验室,南京210008

出　　处：《微体古生物学报》2018年第2期170-180,共11页Acta Micropalaeontologica Sinica

基　　金：中国科学院B类先导专项培育项目(XDPB05;XDB10010100);国家基金委创新研究群体项目(41521061);国家自然科学基金(41772020)联合资助;IGCP653项目"奥陶纪生物大辐射的启运机制"的阶段成果~~

摘　　要：本文报道了江苏仑山岗岗山剖面和湖北宜昌黄花场宜黄-1井岩芯中晚奥陶世五峰组灰色、灰黑色硅质页岩和硅质岩中的放射虫动物群。通过对仑山和宜昌五峰组放射虫动物群的再研究,发现该放射虫动物群以空滴虫科(Inaniguttidae)放射虫发育为特点,丰度高,但分异度低、属种单调,仑山地区仅有一科、一属、两种,包括Inani-gutta webbyi和Inanigutta jiangsuensis。宜昌地区同样发现空滴虫科放射虫,但难以鉴定到属种。两个地区的化石整体保存状况较差。根据伴生的笔石化石判断该放射虫动物群时代为凯迪晚期至赫南特早期。动物群特征与凯迪早、中期放射虫动物群有一定差异。同时,在两地五峰组中还新发现一类分类位置待定的锥形疑似放射虫化石,具有一定的地层对比意义。The research of early Palaeozoic radiolarias in China has achieved great progresses in recent years. Ordovi- clan radiolarias have been recovered from many localities in South China, North China and Northwest China. From the late Tremadocian to early Katian, the radiolaria fossil records are abundant, whereas in the late Ordovician there are only few localities yielding less diverse but well-preserved radiolarias, among the most significant is the hlack shale and cherts of the Wufeng Formaiton at Lunshan, Jiangsu Province and Yichang, Hubei Province. Herein we sampled the black shale and chert samples of the Wufeng Formation （late Katian to early Hirnatian, Upper Ordovician） from the core of Well Yihunag-1, Yichang, Hubei Province, and the Ganggangshan section, Nanjing, Jiangsu Province, for radiolaria analysis. Fortunately, a few significant but poorly-preserved radiolaria fos- sils were extracted. The radiolaria fauna contains several polycystine radiolarias, dominated by Family Inaniguttidae, including Inanigutta webbyi and lnanigutta jiangsuensis, and some other distinctive, cone-shaped specimens with uncertain affinity. The systematic position of the cone-shaped radiolarias cannot be clearly determined at the moment. Their conical siliceous test and some other features resemble Albaillella or Archocyrtiidae-like radiolarias. However, the possibility of being some kind of sponge spicules cannot be excluded. All the cone-shaped radiolarias found at Lun- shan and Yichang bear identical features, which suggests that they are the same group. The discovery of these new forms of radiolarias is of biostratigraphic significance. The Wufeng Formation radiolaria fauna shows different charac- teristics from those of early and middle Katian faunas.

关 键 词：放射虫 五峰组 仑山 岗岗山剖面 宜黄-1井 江苏 湖北 

分 类 号：Q915.5[天文地球—古生物学与地层学]