内蒙古北山西林淘勒二断井组的厘定与沉积环境分析  

Affirm of the Erduanjing formation and analysis of its depositional environment in Xilintaole area, Inner Mongolia

作　　者：张金龙[1] 陈超[1] 潘志龙[1] 张桂凤[1] 张欢[1] 李庆喆[1] 

机构地区：[1]河北省区域地质矿产调查研究所,河北廊坊065000

出　　处：《地质调查与研究》2017年第4期274-280,共7页Geological Survey and Research

基　　金：中国地质调查局"内蒙古1/5万西林淘勒;梧桐井;石桩子井;石板井幅区域地质矿产调查(12120114064101)"

摘　　要：在内蒙古西林淘勒地区1/5万区域地质调查中,对西林淘勒东侧一带原划为早侏罗世赤金堡组进行了剖面测制,发现其为一套灰紫色成熟度差的粗碎屑沉积物,发育硅化木化石,结合区域资料及古生物特征,将其划归二断井组,时代归属于早-中三叠世。根据二断井组沉积构造、粒度等分析结果判断其为冲积扇沉积环境。利用碎屑组分统计和Qt-F-L、Qm-F-Lt以及Qp-Lv-Ls图解对沉积构造背景进行研究,结果表明研究区二断井组物源主要来自火山弧及再循环造山带,为板内造山-盆地演化阶段的产物。During the 1/50 000 regional geological survey in Xilintaole area,Inner Mongolia,the profile of the Early Jurassic Chijinbao formation on the eastern side of Xilintaole was measured and found to be a set of graypurple with poor maturity coarse-grained sediments, silicified fossils, combined with regional data and palaeontological characteristics, were classified into the Erduanjing formation, and the epoch was attributed to the Early-Middle Triassic. Based on the analysis of sedimentary structure and grain size of the Erduanjing formation, and Qt-F-1, Qm-F-Lt and Qp-Lv-Ls,respectively.The results show that the source of the Erduanjing formation in the study area mainly comes from volcanoes arc and recirculation orogenic belt, indicating that the tectonic setting should be orogenic-basin evolution.

关 键 词：北山地区 早-中三叠世 二断井组 硅化木化石 构造环境 

分 类 号：P534.51[天文地球—古生物学与地层学]