中国特马豆克阶笔石地层述评  

TREMADOCIAN (ORDOVICIAN) GRAPTOLITE BIOSTRATIGRAPHY OF CHINA——A REVIEW

作　　者：张元动[1] 王志浩[1] 冯洪真[2] 骆天天[1] B.-D.Erdtmann 

机构地区：[1]中国科学院南京地质古生物研究所 [2]南京大学地球科学系 [3]Institut für Angewandte Geowissenschaften, Technische Universitt Berlin, Ernst-Reuter-Platz 1, Sekr.EB10, D-10587, Berlin, Germany

出　　处：《地层学杂志》2005年第3期215-235,共21页Journal of Stratigraphy

基　　金：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

摘　　要：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。Based on our recent study of the Tremadocian graptolites from the Dayangcha section of Jilin, China, as well as a reinvestigation of the graptolites collected from North China and stored in NIGPAS, a revised Tremadocian graptolite succession of North China is suggested, including in ascending order four zones: Rhabdinopora flabelliformis parabola Zone, Anisograptus matanensis Zone, Psigraptus jacksoni Zone and Aorograptus victoriae Zone. The former misleading Adelograptus-Clonograptus Zone is abandoned. In South China, the graptolites collected from the top of the Tungtzu Fm. at Gulin of southern Sichuan include Hunnegraptus novus, H. sp. etc., and accordingly indicate an age of latest Tremadocian (Hunnegraptus copiosus Zone). Meanwhile a re-examination of Tremadocian graptolite specimens previously collected from many other localities in South China is conducted. On this basis, a new scheme of Tremadocian graptolite biozonation of the South China Palaeoplate is proposed, which includes seven zones. They are in ascending order: Rhabdinopora? taojiangensis Zone,R. flabelliformis parabola Zone,Anisograptus matanensis Zone,R. flabelliformis anglica Zone,Aorograptus victoriae Zone,Acanthograptus sinensis Zone and Hunnegraptus copiosus Zone. A correlation of the revised graptolite biozonation of South China and North China with those of other continents is proposed. The GSSP established at the Green Point section of Newfoundland for the base of the Tremadocian (i.e. Ordovician System), and the GSSP approved at the Diabasbrottet Quarry of Sweden for the top of Tremadocian (i.e. the base of the second stage), are also briefly reviewed, and their identifications discussed.

关 键 词：奥陶系 特马豆克阶 笔石序列 牙形刺序列 GSSP 华北 华南 

分 类 号：P534.42[天文地球—古生物学与地层学]