安徽石台地区中—晚奥陶世牙形类生物地层研究  

MIDDLE AND UPPER ORDOVICIAN CONODONT BIOSTRATIGRAPHY AT THE SHITAI AREA IN ANHUI PROVINCE

作　　者：龚方怡 吴荣昌[1] 闫冠州 栾晓聪 李丽霞[1] GONG Fang Yi;WU Rong Chang;YAN Guan Zhou;LUAN Xiao Cong;LI Li Xia(Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008;University of Chinese Academy of Science,Beijing 100049)

机构地区：[1]中国科学院南京地质古生物研究所,江苏南京210008 [2]中国科学院大学,北京100049

出　　处：《地层学杂志》2023年第1期17-33,共17页Journal of Stratigraphy

基　　金：国家自然科学基金(41672008、42072005);中国科学院青年创新促进会(2019308);中国科学院战略性先导科技专项(B类)(XDB26000000)共同资助。

摘　　要：安徽石台地区柳树亭剖面是下扬子区中—晚奥陶世地层代表性剖面,本文对该剖面开展了详细的牙形类生物地层学研究。通过系统的样品采集分析,在柳树亭剖面的牯牛潭组和大田坝组自下而上识别出牙形类Lenodus antivariabilis带、Lenodus variabilis带、Yangtzeplacognathus crassus带、Dzikodus tablepointensis带、Yangtzeplacognathus jianyeensis带;宝塔组自下而上可识别出Baltoniodus alobatus带和Hamarodus brevirameus带。柳树亭剖面中—晚奥陶世牙形类生物地层序列可以在区域内乃至全球范围内进行较好的对比,但中—晚奥陶世之交缺失Eoplacognathus suecicus带、Yangtzeplacognathus foliaceus带和Yangtzeplacognathus protoramosus带。The Middle and Upper Ordovician conodont biostratigraphy of the Liushuting Section,Shitai,southern Anhui Provicne,is conducted in the present paper.Five conodont biozones are identified in the the Kuniutan and the Datianba formations,including ascendingly the Lenodus antivariabilis,Lenodus variabilis,Yangtzeplacognathus crassus,Dzikodus tablepointensis and Yangtzeplacognathus jianyeensis biozones.Two conodont biozones are identified in the Pagoda Formation overlying the Datianba Formation,including the Baltoniodus alobatus and Hamarodus brevirameus biozones,in ascending order.The conodont zones recognized in the Liushuting Section can be correlated with other areas in the Yangtze Platform and other paleoplates.However,a prominent sedimentary hiatus between the Kuniutan Formation and the Datianba Formation is recognized in the Liushuting Section,spanning the interval from the Eoplacognathus suecicus Biozone to the Yangtzeplacognathus protoramosus Biozone.This hiatus occurs in the late Middle Ordovician and can be traced from the nearshore area to the platform margin on the Yangtze Platform,but with different magnitudes.

关 键 词：中—晚奥陶世 下扬子区 牙形类 生物地层 地层缺失 安徽 

分 类 号：P534.42[天文地球—古生物学与地层学]