太行山西部寒武系超覆层序演化特征

The Evolution Feature of Canibrian Overlaping Sequence in the Western Part of Taihang Mountains

太行山西部位于华北地台的中部地区，吕梁古陆控制了寒武纪地层的发展与演化。通过研究，本区可识别出５个沉积层序：层序１形成于早寒武世龙王庙期与毛庄期，时限约４Ｍａ；层序２形成于中寒武世徐庄期与张夏早期，时限约５Ｍａ；层序３形成于张夏中晚期，时限约６Ｍａ，层序４形成于晚寒武世崮山期至长山末期，时限约１０Ｍａ；层序５形成于凤山期，时限约５Ｍａ。层序１，２，４为１类沉积层序，底部有河流回春作用；层序３、５为Ⅱ类沉积层序。这５个沉积层序自东向西逐渐上超形成超覆层序，反映了碳酸盐台地的形成与发展的演化特征。

The western part of the Taihang mountains lies in the middle part of North China platform. Luliang paleo-land controls the development and evolution of Cambrian strata. TheCambrian sedimentary succession in the studied area suggests five depositional sequences: Sequence 1 formed in Longwangmiao and Maozhang period of Early Cambrian,its age is about4 Ma;Sequence 2 formed in Xuzhang and Early Zhangxia period of Middle Cambrian,its ageis about 5 Ma; Seqpence 3 formed in the Middle and Late Zhangxia period, its age is about 6Ma; Sequence 4 formed in Gushan and Changshan period of Late Cambtian,its age is about10 Ma; Sequence 5 formed in Fengshan period, its age is about 5 Ma. Among them the depositional sequence 1, 2, 4 belong to Type Ⅰsequence boundary, on the bottom there existsriver rejuvenation; and the sequence 3, 5 belong to Type Ⅱsequence boundary. The onlaplug of the five depositional sequences progressing from the east to west has formed an overlaplug sequence, which reflects the formation and development of the evolution feature of carbonate platform.