扬子北缘钟祥地区奥陶系弗洛阶笔石动物群研究  

STUDY ON ORDOVICIAN FLOIAN GRAPTOLITE FAUNA IN ZHONGXIANG AREA, NORTHERN MARGIN OF THE YANGTZE PLATFORM

作　　者：刘浩[1,2] 曾庆銮[1,2] 邓新[1] 金鑫镖 徐大良[1] 张维峰[1] 彭练红[1] LIU Hao;ZENG Qing-luan;DENG Xin;JIN Xin-biao;XU Da-liang;ZHANG Wei-feng;PENG Lian-hong(Wuhan Center of China Geological Survey,Wuhan 430205,China;Key Laboratory of Paleontology and Coevolution of Life and Environment,CGS,Wuhan 430205,China)

机构地区：[1]中国地质调查局武汉地质调查中心,武汉430205 [2]中国地质调查局古生物与生命-环境协同演化重点实验室,武汉430205

出　　处：《古生物学报》2020年第3期303-317,共15页Acta Palaeontologica Sinica

基　　金：中国地质调查局地质调查项目(DD20190050)资助。

摘　　要：湖北钟祥下奥陶统弗洛阶岩性以灰黑色页岩为主,夹粉砂岩及灰岩透镜体,化石丰度和分异度高。通过系统的化石采集和鉴定,于钟祥温峡口剖面识别出笔石7属31种,大体上为扬子地台区的常见属种。自下而上分为Didymograptellus bifidus带、Corymbograptus deflexus带和Azygograptus suecicus带。该序列与宜昌、南漳地区一致,但在笔石动物群组成面貌上差异较大,可能与钟祥地区在早奥陶世位于扬子台地边缘,富集的营养物质和低氧的环境更利于笔石动物群的繁盛和笔石化石的保存有关。The Floian in Zhongxiang,Hubei Province is mainly composed of grayish black shale with siltstone and limestone lens,and has high abundance and diversity of fossils.Thirty-one species belonging to 7 genera of graptolites were identified in Wenxiakou section through systematic collection and identification,which are common genera and species in Yangtze platform area.There are Didymograptellus bifidus Biozone,Corymbograptus deflexus Biozone and Azygograptus suecicus Biozone in ascending order,which is consistent with Yichang and Nanzhang area,but the composition of fossil genera and species is quite different.Zhongxiang area is located at the margin of Yangtze Platform in Floian with rich nutrients and low oxygen environment,which are beneficial to the flourishing of graptolite fauna and the preservation of graptolite fossils.

关 键 词：弗洛阶 笔石生物地层 大湾组 钟祥组 

分 类 号：Q915[天文地球—古生物学与地层学]