摘要
以野外剖面为基础,结合区域地质资料,对塔里木盆地库鲁克塔格地区下寒武统西大山组的深水沉积进行了分析,确定了其沉积环境和海平面变化情况。研究表明,库鲁克塔格北部西大山组发育的层状硅质岩及石膏的成因与火山活动及断裂活动具有密切关系,瘤状灰岩是在经洋流及海水溶解作用后经压实作用而形成的;西大山组是一个向上变浅的沉积序列,沉积环境由次深海过渡为台前斜坡;西大山组所反映的长周期海平面变化背景为海侵末期至海退初期。
On the basis of field outcrops and regional geological data,the paper analysed the deep-water deposits of Xidashan Formation of Early Cambrian in Kuruktag,Tarim Basin,in order to realize the sedimentary environment and sea level changes. It suggests that：（1） The genesis of the bedded siliceous rocks and gypsum of Xidashan Formation in north of Kuruktag should be related to volcanic activities and tectonic activities,while the nodular limestone is formed by compaction after being dissolved by current and sea water.（2） Xidashan Formation is a upward shallowing sedimentary sequence,whose sedimentary environment changed from bathyal environment to fore-platform slope. （3） Long-cycle sea-level changes background reflected by Xidashan Formation is from final stage of marine transgression to early stage of marine regression.
出处
《地质科技情报》
CAS
CSCD
北大核心
2010年第2期52-57,共6页
Geological Science and Technology Information
基金
中国石油化工股份有限公司西部新区勘探指挥部项目"塔里木盆地孔雀河地区沉积体系有效烃源岩与选区评价研究"(XBKT2003KY10002)
