下三叠统殷坑阶和巢湖阶及其界线研究STUDY ON THE LOWER TRIASSIC YINKENGIAN AND CHAOHUAN STAGES AND THEIR BOUNDARY
童金南,赵来时,左景勋
摘要(Abstract)：
系统介绍层型剖面殷坑阶和巢湖阶的定义和地层特征,并重点讨论了两阶之间的界线,即巢湖阶的底界。巢湖阶的底界层型位于近期提出的全球印度阶?奥伦尼克阶界线层型候选剖面———安徽巢湖平顶山西坡剖面上,界线定义为以牙形石Neospathodus waageni的首现点作为第一标志,菊石Flemingites-Euflemingites带底界作为参考标志。在巢湖剖面上,该界线位于三叠纪第2个正向磁极性带上部、三叠纪碳同位素曲线第1次正向漂移峰值附近;在岩石地层系统中,它位于殷坑组中上部位。简要概述了该界线地层的国际和国内对比的主要标志性化石。
关键词(KeyWords)： 下三叠统;年代地层;殷坑阶;巢湖阶;界线层型;巢湖;安徽
基金项目(Foundation): 国家“973项目”(G200007705);; 国家自然科学基金项目(No.40325004,40072011,40232025);; 教育部科技重点项目(重点03033)的支持。
作者(Author): 童金南,赵来时,左景勋
DOI: 10.19839/j.cnki.dcxzz.2005.s1.020
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