川东南-黔北地区志留纪生物礁与古环境演化  

Silurian Reefs and Palaeoenvironment Evolution in Chuandongnan-Qianbei,China

作　　者：万云[1] 张廷山[2] 兰光志[3] 袁建新[1] 

机构地区：[1]重庆石油高等专科学校,重庆630042 [2]南京大学地球科学系 [3]西南石油学院

出　　处：《沉积学报》1997年第A12期106-113,共8页Acta Sedimentologica Sinica

基　　金："油气藏地质及开发工程"国家重点实验室开放基金资助成果之一;项目号GZ-95079712005

摘　　要：川东南—黔北地区下志留统分布广泛,出露好,化石丰富,在海相碎屑沉积中不同程度地发育了碳酸盐岩和生物礁。我们通过对重庆綦江观音桥、贵州坡渡及邻区石牛栏组的野外考察和综合研究发现,生物礁主要发育在早志留世中晚期的石牛栏组中、下部(大致相当于兰多维列中期),类型为小型点礁、生物丘及生物层。造礁生物以床板珊瑚、皱纹珊瑚,层孔虫为主;附礁生物包括苔藓虫、腕足类、鹦鹉螺、海百合等,礁基为生屑滩或瘤状灰岩。礁的发育受区域生境条件制约,靠近黔中隆起的浅海缓坡地带,是生物礁生长发育的有利地区。The Lower Silurian Series in the Chuandongnan - Qingbei area of China is well croped out and contains abundant fossils.The authors have discovered reefs spreading in varying degrees on the layer through field trip and research Qijing Guanyinqiao of Chongqing,Puodu and its neighbouring area.Reef Typifing point,dune,strata grew into the middle-lower layer of Shiniulan formation (equal to middle llandovery).Reef-building biota is mainly composed of Tabulata,Tetracorallia,Stromatoporida. Biodetritus bank and knotty limestone formed reef bottom.Reef growing and spreading was restricted by palaeoenvironment.The shallow slope zone nearing Qianzhong uplift is favorable to reef development.

关 键 词：志留纪 生物礁 古环境演化 礁岩 

分 类 号：P588.248[天文地球—岩石学] P531[天文地球—地质学]