文献类型：期刊文献

中文题名：鄂尔多斯地块南缘中元古界沉积岩地球化学特征

英文题名：Geochemical Characteristics of Mesoproterozoic Sedimentary Rock in the Southern Margin of Ordos Block

作者：陈友智 朱望明

第一作者：陈友智

机构：[1]贵州理工学院资源与环境工程学院;[2]中国地质大学(武汉)构造与油气资源教育部重点实验室;[3]浙江大学地球科学学院;[4]中国石油集团东方地球物理勘探有限责任公司;[5]浙江大学教育部含油气盆地构造研究中心

第一机构：贵州理工学院资源与环境工程学院

年份：2019

卷号：38

期号：3

起止页码：81-87

中文期刊名：地质科技情报

外文期刊名：Geological Science and Technology Information

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：中国地质大学构造与油气资源教育部重点实验室开放课题"华北板块南缘长城纪裂谷沉积的黑色页岩Re-Os同位素约束"(TPR2017-16);贵州省"地质资源与地质工程"重点学科项目(ZDXK[2018]001)

语种：中文

中文关键词：鄂尔多斯地块;中元古界;地球化学;稀土元素;古环境

外文关键词：Ordos Block;Mesoproterozoic;geochemistry;REE;paleoenvironment

摘要：由于缺少足够的年代学数据,鄂尔多斯地块南缘不同分区中元古代地层对比研究较为薄弱。通过分析沉积岩微量元素分布特征,对鄂尔多斯地块南缘不同地区长城纪泥岩沉积物源、沉积环境和构造背景,以及蓟县纪古地理环境进行了研究。结果表明:①洛南和中条山地区沉积物源均来自于沉积岩、钙质泥岩和熊耳群碱性玄武岩;②长城纪鄂尔多斯地块南缘受到熊耳裂陷的伸展作用的同时,还可能受北秦岭古洋盆向华北陆块俯冲作用的影响;③岐山地区蓟县系碳酸盐岩稀土元素的分布特征与古地理环境之间有很好的关联性;④洛南地区Sr/Ba比值能够反映中元古代相对海平面的升降,岐山地区Sr/Ba比值大小与沉积环境相匹配;⑤鄂尔多斯地块南缘长城纪和蓟县纪都存在适于烃源岩发育的古环境。
Due to the lack of chronology data, few studies are reported about the Mesoproterozoic strata correlation in different zones of the southern margin of Ordos Block. This study investigates the tectonic setting, depositional environments, sediment provenances of the southern margin of Ordos Block in Changcheng Period as well as the paleogeographic environments in Jixian Period by the distribution characteristics of trace elements in sedimentary rocks. The analysis of the experiment results produces the following conclusions. Firstly, the sediment provenances of Luonan and Zhongtiaoshan are sedimentary rocks, calcareous mudstone and alkali basalts of Xiong'er Group. Secondly, the southern margin of Ordos Block may be influenced by the extension from Xiong'er rift and suduction from Northern Qinling paleo-ocenic crust thrusting toward North China Block. Thirdly, the distribution pattern of rare earth elements of Jixian System is comparable with depositional model of continental shelf margin′s in Qishan area. Fourthly, variations on Sr/Ba ratio value coincide with the relative sea level changes in Luonan area, and match depositional environments changes in Qishan area. Lastly, the southern margin of Ordos Block′s paleoenvironment benefits the formation of hydrocarbon source rocks in Changcheng Period and Jixian Period.