浙江省长兴县煤山剖面二叠系-三叠系界线层序的沉积微相特征及层序地层划分SEDIMENTARY MICROFACIES AND SEQUENCE STRATIGRAPHY OF THE P-T BOUNDARY BEDS OF THE MEISHAN SECTION, CHANGXING COUNTY, ZHEJIANG
郑全锋
摘要(Abstract)：
通过对浙江煤山剖面二叠系-三叠系界线层序新鲜露头的仔细研究后发现,长兴组顶部岩层(层22—层24)主要由3种微相构成:生物碎屑粒泥灰岩、富有机质生屑泥粒灰岩和含生屑或生屑质高有机质泥状灰岩—粒泥灰岩,其间夹有少量硅质骨针灰岩薄层或条带。殷坑组底部泥岩段(层30—层37)也主要由三种基本微相组成:灰绿色白云质泥岩、黑色白云质泥岩和灰白色瘤状白云质灰岩,其间夹有5层灰绿色火山灰层。界线附近的层25—层29的岩性及生物变化较为独特和复杂,属于以上两者的过渡部分。根据沉积微相组合特征和生物面貌纵向上的变化特征,将界线层序归为斜坡上部、斜坡下部和盆地环境3个沉积相带,并组成一个跨越界线的三级层序,层序底界位于层22中部(层22-11底面)。
关键词(KeyWords)： 煤山剖面;二叠系-三叠系界线;微相特征;层序划分
基金项目(Foundation): 中国科学院国际合作重点项目(GJHZ0521)资助。
作者(Author): 郑全锋
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