湖北松滋、建始地区中、上奥陶统牯牛潭组至宝塔组牙形类及其地层意义  

ORDOVICIAN CONODONTS FROM THE KUNIUTAN TO PAGODA FORMATIONS AT SONGZI AND JIANSHI AREAS, HUBEI PROVINCE,SOUTH CHINA

作　　者：龚方怡 吴荣昌[1] 闫冠州 栾晓聪 张雨晨 GONG Fangyi;WU Rongchang;YAN Guanzhou;LUAN Xiaocong;ZHANG Yuchen(Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008;University of Chinese Academy of Sciences,Beijing 100049)

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》2022年第2期113-136,共24页Acta Micropalaeontologica Sinica

基　　金：国家自然基金委(41672008);中国科学院战略性先导科技专项(B类)(XDB26000000)的资助。

摘　　要：本文针对湖北松滋响水洞剖面及建始小茶园剖面牯牛潭组至宝塔组地层进行了详细的牙形类序列分析及对比。研究结果表明,自下而上可识别7个牙形类化石带,分别是Lenodus antivariabilis带、Lenodus variabilis带、Yangtzeplacognathus crassus带、Dzikodus tablepointensis带、Yangtzeplacognathus foliaceus带、Yangtzeplacognathus jianyeensis带及Hamarodus brevirameus带。剖面牙形类序列与华南中晚奥陶世综合序列基本一致,但缺失达瑞威尔晚期牙形类生物带(Eoplacognathus suecicus带至Yangtzeplacognathus protoramosus带)的完整记录,这一缺失在扬子台地多个剖面均有记录,可能指示达瑞威尔晚期存在的区域性海平面变化以及全球海洋古环境变化事件。Conodonts from the Kuniutan Formation to the Pagoda Formation at the Xiangshuidong and Xiaochayuan sections in Hubei Province were studied in detail. Seven conodont biozones are identified, including the Lenodus antivariabilis, Lenodus variabilis, Yangtzeplacognathus crassus, Dzikodus tablepointensis, Yangtzeplacognathus foliaceus, Yangtzeplacognathus jianyeensis and Hamarodus brevirameus biozones in ascending order, belonging to the Darriwilian to the early Katian. The recognized conodont biozones can be correlated with other areas in the Yangtze Platform and suggest a hiatus spanning the late Darriwilian(Eoplacognathus suecicus and Yangtzeplacognathus protoramosus biozones) between the Kuniutan Formation and the overlying strata. This hiatus can be recognized in several sections on the Yangtze Platform.

关 键 词：牙形类生物地层 地层缺失 牯牛潭组–宝塔组 中–上奥陶统 湖北地区 

分 类 号：P539[天文地球—古生物学与地层学] Q913.85[天文地球—地质学]