于深洋,毛颖颜,李启剑,李越

• 1:中国科学院南京地质古生物研究所中国科学院资源地层学与古地理学重点实验室
• 2:中国科学技术大学
• 3:中国科学院生物演化与环境卓越创新中心

摘要(Abstract)：

黔东北思南鹦鹉溪大息场剖面出露奥陶系—志留系界线处的地层序列,该序列与周缘地区相比较,具有其岩相和生物相的特殊性,以此为据建立新地层单元——大息场组。大息场组实测厚度129.7 m,主体岩性由灰色和灰黄色薄层—中层细砂岩和粉砂岩组成,下部暗色粉砂岩中产出3层笔石,指示该组时限为凯迪期晚期到鲁丹期末期。大息场组的碎屑岩层之间不存在暴露海平面之上的标志,表明这里地处局限的凹陷带,此时黔中古陆以北发生的海退未波及至此。

关键词(KeyWords)： 大息场组;奥陶-志留系之交;思南;黔东北;华南板块

Abstract:

Keywords:

基金项目(Foundation): 中国科学院战略性先导科技专项(B类,子课题编号XDB10010503;XDB26000000);; 国家基金委重大项目第一课题(批准号:41290260)的共同资助

作者(Author): 于深洋,毛颖颜,李启剑,李越

DOI: 10.19839/j.cnki.dcxzz.2019.02.003

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