川西地区震旦纪地层新发现  

NEW DISCOVERY OF THE SINIAN STRATA IN WESTERN SICHUAN

作　　者：刘静江[1] 周慧[1] 刘慧荣[2] 翟秀芬[1] 池英柳[1] LIU Jing Jiang;ZHOU Hui;LIU Hui Rong;ZHAI Xiu Fen;CHI Ying Liu(China Petroleum Exploration and Development Research Institute,Beijing 100083;Development Division of Tarim Oilfield Company,Korla 841000)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]塔里木油田公司开发事业部,新疆库尔勒841000

出　　处：《地层学杂志》2023年第3期324-338,共15页Journal of Stratigraphy

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目(2021DJ05)资助。

摘　　要：川西绵竹清平地区震旦纪地层齐全,出露有震旦系陡山沱组和灯影组,灯影组包含灯一段至灯四段的全部地层。陡山沱组为一套滨岸至浅水陆棚相砂泥岩夹浊流相白云岩。灯一段和灯二段为大套典型的局限台地相凝块白云岩、藻纹层白云岩和叠层石白云岩,富含葡萄状、花边状构造,残余厚度500~600m;灯三段为一套灰黑色页岩夹黑色硅质岩,夹少量薄层白云岩,残余厚度12~88m;灯四段主要为一套浅灰色、灰白色厚层凝块白云岩、藻纹层白云岩,夹少量砂质白云岩,含黑色和白色硅质条带,残余厚度115~869 m,沉积相为典型的局限台地相。It is found that the Sinian strata in Qingping area of Mianzhu,western Sichuan is complete,including the Doushantuo and Dengying formations.The Dengying Formation includes four members from the Dengying 1 to Dengying 4.Doushantuo Formation is a sequence deposited in the shore-to-shallow shelf facies,consisting of sandstone,mudstone mixed with dolostone.The Dengying 1 and Dengying 2 members are characterized by the clotted dolostone,algal dolostone and stromatolitic dolostone deposited in a large set of typical restricted platform facies,which are rich in grape-like and lace-like structures with a thickness of 500-600 m.The Dengying 3 Member is a set of the gray-black shale mixed with black siliceous rocks and thin-bedded dolostone,with a thickness of 12-88 m.The Dengying 4 Member is mainly a set of grayish light gray,grayish white thick-layered clotted dolostone and algal dolostone,with a small amount of sandy dolostone and black and white siliceous bands,with a thickness of 115-869 m,suggesting a typical limited platform facies.

关 键 词：碳酸盐岩台地 裂陷槽 震旦系 四川盆地 

分 类 号：P534.31[天文地球—古生物学与地层学]