刘清俊,石岩,邢罡,林海亮,杨全合,戴金明
LIU Qingjun,SHI Yan,XING Gang,LIN Hailiang,YANG Quanhe,DAI Jinming

• 1:北京市地质勘察技术院
• 2:中国地质大学长城学院
• 3:北京城建勘测设计研究院有限责任公司

摘要(Abstract)：

在野外露头及钻井岩心砂岩稀土元素、碎屑组成分析的基础上,对塔北地区下志留统各构造单元的物源区及构造背景进行了分析。研究表明:各构造单元的沉积物源具有同源性,主要来自于大陆上地壳旋回造山带的钙质、泥质沉积岩;至少存在2个物源区,东部物源区为库鲁克塔格隆起,西部物源区来自于柯坪隆起周围的剥蚀区;各构造单元构造背景不同,草湖凹陷为大陆岛弧构造背景,阿克库勒凸起、哈拉哈塘凹陷和沙西凸起介于活动陆缘构造背景与被动陆缘构造背景之间,柯坪隆起为被动陆缘构造背景。
On the basis of REE and clastic compositions analyses for the field outcrops and drilled core sandstones,the provenances and tectonic settings of each tectonic unit in Lower Silurian of Tabei area are figured out.The studies show that the sedimentary source areas of different structural units are characterized by homologue i.e.from the calcareous and argillaceous sedimentary rocks of the continental supracrustal recycled orogenic belts;there are at least two provenances:the east one is Kuluketage Uplift and the west is considered to the stripped area around Keping Uplift;the tectonic settings of each unit are different:Caohu Sag belongs to a continental island arc setting whereas Akekule Uplift,Halahatang Sag and Shaxi Uplift are between an active and passive continental marginal tectonic settings;and Keping Uplift is regarded as a passive continental marginal tectonic setting.

关键词(KeyWords)： 塔北地区;下志留统;砂岩;稀土元素;源区;构造背景
Tabei area;Lower Silurian;sandstone;rare earth element(REE);provenance;tectonic/structural setting

Abstract:

Keywords:

基金项目(Foundation): 中国石化西北分公司勘探开发研究院项目“塔里木盆地古生界碎屑岩层序地层格架与有利储集体展布及成藏研究”资助

作者(Author): 刘清俊,石岩,邢罡,林海亮,杨全合,戴金明
LIU Qingjun,SHI Yan,XING Gang,LIN Hailiang,YANG Quanhe,DAI Jinming

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