湘黔交境中晚寒武世白云岩相区层序地层研究

• 作 者: 王尚彦 杨家騄 林启祥 龚淑云 秦松贤 孟德保
• 机 构: 中国地质大学地球科学学院!武汉430074,中国地质大学地球科学学院!武汉430074,中国地质大学地球科学学院!武汉430074,中国地质大学地球科学学院!武汉430074,中国地质大学地球科学学院
• 出 处: 地球科学
• 发表日期: 1999年06期
• 关键词: 晚寒武世 层序地层 白云岩化 海进体系域 高水位体系域 白云岩相 湘黔交境 斜坡区 层序界面 古岩溶

根据新发现的许多古岩溶不整合面和暴露带 ,以及副层序和副层序叠置规律 ,将湘黔交境台地中晚寒武世娄山关组 (白云岩相 )划分为 7个三级层序 ,每一层序都由海进体系域和高水位体系域组成 ,缺少低水位体系域沉积 .同时归纳和描述了 6种副层序类型 .这些三级层序与东邻台缘斜坡区的划分基本吻合 ,但缺少该区的层序Ⅲ1.从整体看 ,本区层序Ⅲ2 ,Ⅲ3 ,Ⅲ4 ,Ⅲ5,Ⅲ6的底界和Ⅲ7的顶界具广泛对比性 ,大大提高了哑地层的对比精度

According to the newly discovered unconsolidated and exposed zones of paleokarst and the overlaps of the secondary and secondary sequences, the Loushanguan Formation (dolomite facies) of the middle-late Cambrian in the platform of the Xiang-Qian region is divided into seven Third-order sequences, each of which consists of marine-derived system tract and high-water system tract, lack of sedimentation of low-water system tract, and at the same time, six kinds of secondary sequence types are summarized and described. The division of marginal slope area is basically consistent, but it lacks the sequence of this area. Ⅲ 1. As a whole, the top boundaries of Ⅲ2, Ⅲ3, Ⅲ4, Ⅲ5 and Ⅲ6 in this area are broadly contrasted with the top of Ⅲ7, Dim stratum contrast accuracy