中国华北不同相区奥陶纪牙形刺生物地层的再认识  

REVIEW OF THE ORDOVICIAN CONODONT BIOSTRATIGRAPHY IN THE DIFFERENT FACIES OF NORTH CHINA

作　　者：王志浩[1] 甄勇毅 张元动[1,3] 吴荣昌[1,3] 

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]澳大利亚新南威尔士州地质调查所 [3]中国科学院资源地层学与古地理学重点实验室,江苏南京210008

出　　处：《地层学杂志》2016年第1期1-16,共16页Journal of Stratigraphy

基　　金：国家基金委创新研究群体项目(批准号:41221001;41290260;41521061);国家自然科学基金(No.41172034)资助;IGCP591项目"早;中古生代重大事件"的阶段成果

摘　　要：总结和重新研究了我国华北地区奥陶纪牙形刺生物地层,修订了安太庠等(1983)和安太庠、郑昭昌(1990)建立的牙形刺带序列。修订后的牙形刺带由下而上可划分为:特马豆克阶(Tremadocian)的Iapetognathus jilinensis-Cordylodus lindstromi带,C.angulatus带,Chosonodina herfurthi带,Rossodus manitouensis带,Glyptoconus quadraplicatus带和Scalpellodus tersus-Triangulodus aff.bifidus带;弗洛阶(Floian)的Serratognathus bilobatus带,S.extensus带,Paraserratognathus obesus带和Jumudontus gananda带;达瑞威尔阶(Darriwilian)的Histiodella holodentata-Tangshanodus tangshanensis带,Eoplacognathus suecicus-Histiodella kristinae带,Pygodus anitae带和P.serra带;桑比阶(Sandbian)的P.anserinus带,Plectodina aculeata带,Erismodus quadridactylus带,Belodina compressa带和Phragmodus undatus带,以及凯迪阶(Katian)的Belodina confluens带,Yaoxianognathus neimengguensis带和Y.yaoxianensis带;同时把寒武系-奥陶系界线置于Iapetognathus jilinensis-Cordylodus lindstromi带之底界。这一新的牙形刺序列,可以在更大范围内更精准地划分和对比华北地区的奥陶纪地层,如奥陶系中、上统除其顶部两个带只能在国内直接对比外,几乎所有的牙形刺带都可与国内外奥陶纪的牙形刺带逐带对比。同时,从这一新的牙形刺序列中也可明显看出,其中缺失了大坪阶(Dapingian)的牙形刺带,证明华北地区在奥陶纪大坪期由于怀远运动的抬升而未接受沉积,从而改变了华北地区奥陶系下、中统间地层为连续沉积的看法,纠正了把下马家沟期北庵庄组归入大坪期并与华南扬子区大湾组对比的认识。Based on the restudy of the Ordovician conodonts in different facies of North China,the Ordovician conodont zonation of North China can be summarized in the ascending order：Tremadocian：Iapetognathus jilinensis-Cordylodus lindstromi,Cordylodus angulatus,Chosonodina herfurthi,Rossodus manitouensis,Glyptoconus quadraplicatus,and Scalpellodus tersus-Triangulodus aff.bifidus zones;Floian：Serratognathus bilobatus,S.extensus,Paraserratognathus obesus,and Jumudontus gananda zones;Darriwilian：Histiodella holodentata-Tangshanodus tangshanensis,Eoplacognathus suecicus-Histiodella kristinae,Pygodus anitae,and P.serra zones;Sandbian：Pygodus anserinus,Plectodina aculeata,Erismodus quadridactylus,Belodina compressa,and Phragmodus undatus zones;Katian：Belodina confluens,Yaoxianognathus neimengguensis and Y.yaoxianensis zones.The Cambrian-Ordovician boundary is at the base of the Iapetognathus jilinensis-Cordylodus lindstromi Zone.This revised conodont succession can be more precisely correlated regionally and internationally than those erected by An Tai-xiang et al.（1983）and An Tai-xiang Zhen Zhao-chang（1990）.Our recent studies also revealed the regional absence of the Dapingian conodont zones.It indicated a significant depositional gap between the Floian and Darriwilian strata in North China,apparently caused by the Huaiyuan Epeirogeny.This result has changed the long standing view held by most of geologists in China that the deposition from the Floian to Darriwilian in North China was more or less continuous.

关 键 词：生物地层 牙形刺 不同相区 奥陶系 华北 

分 类 号：P534.42[天文地球—古生物学与地层学]