摘要
新疆塔里木西北缘柯坪地区上奥陶统印干组碳酸盐岩发育良好,不同地区岩性变化较大。通过对其不同剖面位置的微相类型进行研究,识别出10种微相类型,与威尔逊标准相模式对比,将其划分为5种沉积相,在印干组中首次识别出台缘浅滩相、台地边缘斜坡相。印干组沉积期古地理特征为南西水浅(主要为台缘浅滩-台缘斜坡相)、北东水深(主要为广海陆棚-盆地边缘相)。通过沉积相变化规律,识别出在印干组沉积中晚期,存在一次大规模海退事件。
The carbonate rocks during Late Ordovician Yingan Formation in Keping Northwest Tarim,was well devel- oped,and has different lethology in different area.Through the contrast of the microfacise in different profile,it can be di- vided into ten microfacies types and five sedimentary facies.Platform margin and Platform margin slope has been first distinguished in Yingan Formation.The Palaeogeography features in Yingan Formation is that Southwest area has shal- low water(platform margin shoal-platform slope) and Northeast area has depth water(open continental shelf-deep sea ba- sin).Through the change of facies,a large-scale regression has been existed in Middle-Late Yingan Formation.
作者
阎琨
赵志刚
马伟
韩小梦
Yan Kun;Zhao Zhigang;Ma Wei;Han Xiaomeng(The 7^th Gold Detachment of People's Armed Police,Yantai,,Shandong,264000,China)
出处
《新疆地质》
CAS
CSCD
北大核心
2019年第3期363-367,共5页
Xinjiang Geology
基金
中国地质调查局地质调查项目“西南天山柯坪地区六幅地质矿产综合调查”（1212011504201）
关键词
柯坪
印干组
沉积微相
古地理
海退
Keping
Yingan Formation
Microfacies analysis
Palaeogeography
Regression
