右江盆地二叠纪生物礁时空分布和沉积构造演化新知  

Recent Approach to Space—Time Distribution and Sedimentary Structural Evolution of Permian Reef in Youjiang Basin

作　　者：陆刚[1] 胡贵昂[2] 张能[2] 张耿[2] 潘艺文[2] 彭阳[2] 

机构地区：[1]桂林工学院资源与环境工程系 [2]中国地质科学院地质研究所,北京100037

出　　处：《地质论评》2006年第2期190-197,i0006,共9页Geological Review

基　　金：国家自然科学基金资助项目(编号40372058);中国地质调查局项目(编号200313000047)的成果

摘　　要：笔者等在右江盆地开展的1:5万区域地质调查工作中,研究了二叠纪海绵礁、藻礁的分布、时代、岩石类型、发育特征及发展演化,取得了新的认识,认为沿大小台地边缘断续发育的礁滩相沉积,是一套具有成因联系、密切相关的广义礁灰岩组合;礁灰岩主要形成于高水位期;成礁时代始于早二叠世紫松期晚期,并一直延续至晚二叠世末,划分为三个造礁期。完整连续、环状的礁滩相带及台缘沉积岩墙群、假不整合构造的分布、发育特征,证明右江盆地从泥盆纪至三叠纪是连续发育的沉积海盆;包含于三叠系中的晚古生代地层是孤立碳酸盐台地沉积,是原地系统,而非后期推覆构造形成的无根异地系统。Early--middle Permian sponge--algal limestones along isolated-platforms margin are recently identified sponge--algal-reef in Yo ujiang basin. Therefore there exist three reef-building stages （early, middle and late Permian） instead of one （middle Permian）. Started earlier or later and fitfully circled the platform margins from early to late Permian, those reefs outline clearly isolated-platforms and basins framework in Youjiang Permian basin. In addition, considering the limestone dikes and the cliff-like pseudo-unconformity occurring along the platform margins and the correlated strata sequences developed in Youjiang basin the Palaeozoic isolatedplatforms surrounded by Triassic strata are undoubted in situ system instead of tectonic-formed detached blocks.

关 键 词：生物礁 二叠纪 右江盆地 孤立碳酸盐台地 

分 类 号：P534.46[天文地球—古生物学与地层学]