河北唐山达瑞威尔阶(Darriwilian)牙形刺生物地层的新认识  

A REVISION OF THE DARRIWILIAN BIOSTRATIGRAPHIC CONODONT ZONATION IN TANGSHAN,HEBEI PROVINCE BASED ON NEW CONODONT COLLECTIONS

作　　者：王志浩[1] Bergstrom S M 甄勇毅 张元动[1,5] 吴荣昌[1] 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008 [2]School of Earth Sciences,Division of Earth History,The Ohio State University,Columbus,Ohio 43210,USA,Bergstrom [3]Geological Survey of New South Wales,Division of Resources&Energy [4]NSW Trade&Investment,W.B.Clarke Geoseience Centre,947-953 Londonderry Rd,Londonderry,NSW 2753,Australia [5]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：《古生物学报》2014年第1期1-15,共15页Acta Palaeontologica Sinica

基　　金：国家基金委创新研究群体项目(41221001,41290260);国家自然科学基金(41172034)联合资助;IGCP 591项目“早、中古生代重大事件”的阶段成果

摘　　要：本文作者对河北唐山赵各庄剖面的北庵庄组(原称下马家沟组)和马家沟组(原称上马家沟组)较系统地采集了牙形刺样品,通过对所获之牙形刺标本和安太库等(1983)在同一剖面所描述的牙形刺动物群仔细研究,得到一些新的认识、分带及对比意见。唐山赵各庄剖面不仅具有丰富各异的地方型分子,如Aurilobodus leptosomatus,Loxodus dissectus,Tangshanodus tangshanensis,Rhipidognathus maggolensis,R.laiwuensis,Triangulodus changshanensis和Erraticodon tangshanensis外,尚有一些分布广泛和具地层意义的重要分子,如Histiodella holodentata,Eoplacognathus pseudoplanus和Eoplacognathus suecicus等。根据这些重要分子和牙形刺分带原则,本文对安太庠等(1983)的牙形刺分带重新修订,即将北庵庄组的Aurilobodus leptosomatus-Loxodus dissectus带和Tangshanodus tangshanensis带修正为Histiodella holodentata-Tangshanodus tangshanensis带,并由下而上可划分为Rhipidognathus maggolensis和R.laiwuensis两地方型亚带;将马家沟组的Eoplacognathus suecicus-Acontiodus?linxiensis带和Plectodina onychodonta带修正为Eoplacognathus suecicus带,并由下而上又可划分为Acontiodus?linxiensis和Plectodina onychodonta两个地方型牙形刺亚带。因此,唐山地区的北庵庄组产牙形刺的部分和马家沟组可与华南的牯牛潭组和新疆塔里木盆地的大湾沟组对比,归入奥陶纪达瑞威尔阶(Darriwilian),从而改变了过去将北庵庄组产牙形刺的层位,即所谓的Aurilobodus leptosomatus-Loxodus dissectus带和Tangshanodus tangshanensis带与华南区大坪阶(Dapingian)的大湾组相对比的认识。The present study is based on samples from the Beianzhuang and Machiakou formations at Zha- ogezhuang, Tangshan in Hebei. The rich conodont faunas of these units were previously studied by An et al. （1983）. Our samples were very productive and yielded numerous specimens of not only the same endemic species as reported by An et al. （1983） such as Aurilobodus leptosomatus , Loxodus dissectus , Tangshanodus tangshanensis , Nhipidognathus rnaggolensis , R. laiwuensis, Triangulodus changshanensis , and Erraticodon tangshanensis, but also more widely distributed species, such as Histiodella holodentata, Eoplacognathus pseudoplanus and Eoplacognathus suecicus. An et al. （1983） subdivided the Ordovician Lower Machiakou Formation （= Beianzhuang Formation of this paper） into the Aurilobodus leptoso- matus-Loxodus dissectus Zone and the Tangshanodus tangshanensis Zone, and the Upper Machiakou Formation （= Machiakou Formation of this paper） into the Eoplacognathus suecicus-Acontiodus ？ linxiensis Zone and the Plectodina onychodonta Zone. They correlated the Lower and Upper Machiakou formations with the Dawan Formation （Dapingian） and Kuniutan Formation （Darriwilian） of South China, respectively. Until now this conodont biostratigraphy and associated correlations have been generally used by Chinese geologists. The first occurrences and ranges of Aurilobodus leptosomatus , Loxodus dissectus , Tangshanodus tangshanensis , and Histiodella holodentata （= Histiodella infrequensa An in the paper of An et al. , 1983） are nearly the same in our study sec- tion （Text-fig. 1） and as shown by An et al. （1983, text-fig. 7）. However, it is impossible tosubdivide the Beianzhuang Formation into the Au- rilobodus leptosornatus-Loxodus dissectus Zone and the Tangshanodus tangshanensis Zone based on the first occurrences and ranges of zonal species. Also, it is very difficult to correlate these zones with those of other areas because of the striking provincial faunal differences. Based on the present r

关 键 词：达瑞威尔阶 牙形刺 生物地层 新认识 唐山 河北 

分 类 号：Q915[天文地球—古生物学与地层学]