张元动,王志浩,冯洪真,骆天天,B.-D.Erdtmann

• 1:中国科学院南京地质古生物研究所
• 2:中国科学院南京地质古生物研究所
• 3:南京大学地球科学系
• 4:中国科学院南京地质古生物研究所

摘要(Abstract)：

特马豆克阶是奥陶系第一个顶底界均已确立全球界线层型的年代地层单元,由于这两个GSSP都不在我国,因此如何在我国各个地区准确识别这两条界线,了解阶内的笔石和牙形刺序列,对我国奥陶纪地层和古生物研究具有重要意义。简要介绍特马豆克阶和奥陶系底界全球层型的纽芬兰GreenPoint剖面及特马豆克阶顶界全球层型的瑞典Diabasbrottet剖面,对界线附近的生物地层进行了分析讨论,并对GSSP的确立过程作了简要回顾。在以往大量成果积累及近年来工作的基础上,对我国特马豆克阶的笔石序列提出了新的观点:根据对吉林大阳岔等剖面的最新研究,华北板块的特马豆克阶笔石地层从下至上可以识别出4个笔石带——Rhabdinoporaflabelliformisparabola带、Anisograptusmatanensis带、Psigraptusjacksoni带和Aorograptusvictoriae带,弃用以往长期使用的Adelograptus-Clonograptus带;同时提出华南的特马豆克阶从下到上可以识别出7个笔石带——Rhabdinopora?taojiangensis带,R.flabelliformisparabola带,Anisograptusmatanensis带,R.flabelliformisanglica带,Aorograptusvictoriae带,Acanthograptussinensis带,Hunnegraptuscopiosus带。对采自四川古蔺纳羊箐桐梓组顶部笔石标本的研究表明,该层位相当于特马豆克期末的Hunnegraptuscopiosus带。此外还将我国的特马豆克阶笔石序列与国外若干主要地区进行了对比。

关键词(KeyWords)： 奥陶系;特马豆克阶;笔石序列;牙形刺序列;GSSP;华北;华南

Abstract:

Keywords:

基金项目(Foundation): 中国科学院知识创新工程重大项目(KZCX2-SW-129);; 国家重点基础研究发展规划(973)项目(G2000077700);; 国家自然科学基金(No.40372007);; 德国马普学会资助

作者(Author): 张元动,王志浩,冯洪真,骆天天,B.-D.Erdtmann

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