藏北安多—巴青地区侏罗纪含礁层系岩相及沉积环境  

FACIES AND ENVIRONMENTS OF JURASSIC REEF-BEARING STRATA IN ANDUO—BAQING AREA, NORTHERN XIZANG(TIBET)

作　　者：龚文平[1] 肖传桃[2] 胡明毅[1] 李艺斌[1] 柳书兵[3] 

机构地区：[1]长江大学地球科学学院,湖北荆州434023 [2]中国地质大学地球科学学院,武汉430074 [3]中国石油化工股份有限公司江汉油田分公司井下作业处,湖北潜江433123

出　　处：《地质科学》2006年第3期479-488,共10页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：湖北省教育厅计划类项目(03Z0105)"藏北安多-巴青地区侏罗纪生物礁"成果。

摘　　要：根据岩性及其组合特征,本文将西藏北部安多—巴青地区侏罗纪含礁地层划分为流水成因的颗粒岩岩相、流水成因的碎屑岩岩相、复成因的泥晶—泥质灰岩岩相、生物及生物化学成因的障积岩岩相、生物及生物化学成因的粘结—障积岩岩相和生物及生物化学成因的骨架岩岩相等6大类型,计16种岩相。它们构成了潮坪相组合、台地浅滩相组合、开阔台地相组合和台地生物礁相组合共4种岩相组合,并由下而上有规律地形成2种岩相序列,即陆源碎屑与碳酸盐混合台地相序列和碳酸盐台地相序列。Based on the characteristics of lithologies and rock associations, the Jurassic reef-bearing strata in Anduo-Baqing area, northern Xizang （Tibet）, could be classified into 6 groups of lithofacies： water current genetic grainstone, water current genetic clastic rock, polygenetic micritic limestone and marl, biogenetic and biochemical genetic baffling rock, biogenetic and biochemical genetic cemented-baffling rock, as well as biogenetic and biochemical genetic framestone. These lithofacies made up four kinds of lithofacies associations： tide plat, open platform, platform shoal and platform reef ones. The four lithofacies associations constituted two depositionary successions in ascending order, namely, the succession of mixed carbonateterrigenous platform lithofacies and succession of carbonate rock platform lithofacies. Both of them indicated a relatively stable tectonic setting of shallow marine platform, different from the lithofacies associations and sedimentation of back-arc basin in Early Cretaceous.

关 键 词：生物礁 岩相 岩相组合 沉积环境 西藏北部 

分 类 号：Q911[天文地球—古生物学与地层学]