CAJ | 학술논문

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.
이야외부면위기출,결합구역지질자료,대탑리목분지고로극탑격지구하한무통서대산조적심수침적진행료분석,학정료기침적배경화해평면변화정황.연구표명,고로극탑격북부서대산조발육적층상규질암급석고적성인여화산활동급단렬활동구유밀절관계,류상회암시재경양류급해수용해작용후경압실작용이형성적;서대산조시일개향상변천적침적서렬,침적배경유차심해과도위태전사파;서대산조소반영적장주기해평면변화배경위해침말기지해퇴초기.
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.