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
王志浩,甄勇毅,张元动,吴荣昌
摘要(Abstract):
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。
关键词(KeyWords): 生物地层;牙形刺;不同相区;奥陶系;华北
基金项目(Foundation): 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
作者(Author): 王志浩,甄勇毅,张元动,吴荣昌
DOI: 10.19839/j.cnki.dcxzz.2016.01.001
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