黔中贵阳乌当地区下-中奥陶统的牙形刺生物地层  

CONODONT BIOSTRATIGRAPHY OF THE LOWER−MIDDLE ORDOVICIAN IN WUDANG,GUIYANG,GUIZHOU PROVINCE,SOUTH CHINA

作　　者：池祥日 杨宇宁[1,2] 闫冠州 阳磊 彭庭祖 张倩倩 何敏 刘静 CHI Xiangri;YANG Yuning;YAN Guanzhou;YANG Lei;PENG Tingzu;ZHANG Qianqian;HE Min;LIU Jing(College of Resources and Environmental Engineering,Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang 550025;State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008;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]贵州大学资源与环境工程学院,喀斯特地质资源与环境教育部重点实验室,贵阳550025 [2]中国科学院南京地质古生物研究所,现代古生物学和地层学国家重点实验室,南京210008 [3]中国科学院南京地质古生物研究所,南京210008 [4]中国科学院大学,北京100049

出　　处：《微体古生物学报》2023年第1期13-32,共20页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金项目(编号41890845、42162003);贵州省科技计划项目(黔科合平台人才2017-5788);中国科学院南京地质古生物研究所现代古生物学和地层学国家重点实验室开放课题(编号173130);贵州省人才基地项目(编号RCJD2018-21);贵州大学大学生创业训练计划项目(贵大国创字2019-012)共同资助。

摘　　要：奥陶纪时期紧邻黔中古陆南缘的贵阳乌当发育有富含牙形刺的碳酸盐岩沉积,但生物地层研究非常薄弱。本文对乌当地区小谷龙剖面和豹子窝剖面的奥陶系进行牙形刺生物地层研究,共识别出10个牙形刺带,自下而上为Chosonodina herfurthi带、Drepanodus arcuatus带、Triangulodus bifidus带、Serratognathus diversus带、Oepikodus evae带、Baltoniodustriangularis带、Baltoniodusnavis带、Baltoniodusnorrlandicus带、Lenodusantivariabilis带和Dzikodustablepointensis带,时代属于下奥陶统特马豆克阶至中奥陶统达瑞威尔阶,可与华南同期地层的化石带对比。根据牙形刺生物地层,本研究构建了乌当地区奥陶系的年代地层格架,并限定黔中古陆南缘开始暴露出水面的时间为不晚于中奥陶世达瑞威尔期早期。Ordovician strata of Wudang,Guiyang,where closed to the southern margin of the Central Guizhou Oldland during the Ordovician age,is dominated by carbonate rocks and thus ideal for conodont study.Previously,little has been known about the conodont fauna from the sea surrounding the oldland.Here we report the Ordovician conodonts from the Xiaogulong and the Baoziwo sections in Wudang.Based on their occurrances,ten conodont biozones were detected.In ascending order,these are Chosonodina herfurthi zone,Drepanodus arcuatus zone,Triangulodus bifidus zone,Serratognathus diversus zone,Oepikodus evae zone,Baltoniodus triangularis zone,Baltoniodus navis zone,Baltoniodus norrlandicus zone,Lenodus antivariabilis zone and Dzikodus tablepointensis zone.All of which belong to Ordovician Tremadocian to Darriwilian in age and correspond well with those recognized previously from other regions of China.Moreover,chronostratigraphic framework of the Ordovician in Wudang is erected based on the conodont biostratigraphy.It is suggested that the southern margin of the Central Guizhou Oldland exposed above the sea level at least from the early of the Ordovician Darriwilian.

关 键 词：牙形刺 生物地层 下–中奥陶统 黔中古陆 贵阳乌当 

分 类 号：Q913.85[天文地球—古生物学与地层学]