论文部分内容阅读
传统上认为湘黔交界处的中寒武统—下奥陶统娄山关组为均一性极强的厚层白云岩,可分性极差。但笔者新近研究发现,其顶、底均为古岩溶不整合面,并有大量颗粒(鲕、豆、核形石)白云岩和藻纹层白云岩夹层,还有许多鸟眼构造、叠层石构造、交错层理、帐蓬构造存在。据其垂向组合规律,将娄山关组分为三段。认为娄山关组由7个三级层序组成,层序界面为古岩溶不整合面或暴露带,每个层序都由海进体系域和高水位体系域构成。
Traditionally, the Middle Cambrian-Lower Ordovician Loushanguan Formation at the junction of Hunan and Guizhou is a thick homogenous dolomite with very poor separability. However, the author’s recent study found that the top and bottom are paleokarst unconformities, and there are a large number of dolomite (algal, bean and nucleolitic) dolomite and algal dolostone intercalations, as well as many birds-eye structures and laminates Stone structure, staggered bedding, tents structure exists. According to its vertical combination of law, will be divided into three sections Loushanguan. It is concluded that the Loushanguan Formation consists of 7 third-order sequences, the sequence interface is paleokarst unconformity or exposed zone, and each sequence is composed of marine-derived system tract and high-watermark system tract.