鄂尔多斯盆地陇东地区二叠系山西组&#x02014;石盒子组母岩类型和构造背景

doi:10.7605/gdlxb.2017.02.022

古地理学报 ›› 2017, Vol. 19 ›› Issue (2): 285-298. doi: 10.7605/gdlxb.2017.02.022

• 岩相古地理学及沉积学 • 上一篇下一篇

鄂尔多斯盆地陇东地区二叠系山西组—石盒子组母岩类型和构造背景

贺敬聪¹, 朱筱敏¹, 李明瑞², 刘芬¹, 叶蕾¹, 薛梦戈¹

１中国石油大学（北京）地球科学学院，北京102249。
２中国石油长庆油田分公司勘探部，陕西西安71001。

收稿日期:2016-09-29 修回日期:2016-11-22 出版日期:2017-04-01 发布日期:2017-04-01
通讯作者: 通讯作者简介朱筱敏,男,1960年生,教授,博士生导师,主要从事沉积学和层序地层学教学研究。E-mail: xmzhu@cup.edu.cn。
作者简介:贺敬聪,男,1991年生,硕士研究生,主要从事沉积地质学研究。E-mail: hjc_91@163.com。

Parent rock types and tectonic setting of the Permian Shanxi and Shihezi Formations in Longdong area,Ordos Basin

He Jingcong¹, Zhu Xiaomin¹, Li Mingrui², Liu Fen¹, Ye Lei¹, Xue Mengge¹

1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249.;
2 Exploration Department,Changqing Oilfield Company,PetroChina, Xi'an 710018,Shaanxi;

Received:2016-09-29 Revised:2016-11-22 Online:2017-04-01 Published:2017-04-01
About author:About the first author He Jingcong,born in 1991,is a master degree candidate of China University of Petroleum(Beijing). He is mainly engaged in sedimentary geology. E-mail: hjc_91@163.com.About the corresponding author Zhu Xiaomin,born in 1960,is a professor and Ph.D. supervisor in China University of Petroleum(Beijing). He is mainly engaged in sedimentology and sequence stratigraphy. E-mail: xmzhu@cup.edu.cn.

摘要/Abstract

摘要： 通过岩石学及地球化学分析方法,对鄂尔多斯盆地陇东地区二叠系山西组1段—石盒子组8段碎屑岩物源区的母岩类型和构造属性进行分析。研究结果表明: 山1段和盒8段的砂岩碎屑组成相似,具有基本相同的物源区组成,它们在构造背景、物源及物源特征上具有很好的继承性;砂岩碎屑颗粒镜下特征及石英阴极发光颜色显示母岩主要为变质岩和火成岩;轻矿物特征反映物源与再循环造山带源区中的碰撞缝合线及褶皱—逆掩带物源区密切相关;研究区与北秦岭地区秦岭群和宽坪群斜长石种类一致;构造环境判别图解反映物源区长期受被动大陆边缘物源影响,到晚古生代后期有向主动大陆边缘转换的趋势;源岩判别图解显示物源区主要是长英质岩石;山1段、盒8段沉积岩的REE配分模式均呈右倾型且基本相互平行,与北秦岭地区秦岭群、宽坪群变质岩的稀土元素配分模式相似;锆石U-Pb同位素定年结果显示物源主要来自元古代,有少部分来自晚古生代。综合分析认为研究区主要受被动大陆边缘物源影响,其次为主动大陆边缘物源,母岩主要为北秦岭下元古界秦岭群的片麻岩、石英岩等和中、上元古界宽坪群的绿泥石片岩、阳起石片岩,其次为北秦岭造山带晚古生代岩浆岩。

关键词: 岩石学, 地球化学, 母岩类型, 构造背景, 山西组, 石盒子组, 陇东地区, 鄂尔多斯盆地

Abstract: Based on petrological and provenance analysis,this paper discusses tectonic property and provenance of the Member 1 of Shanxi Formation and Member 8 of Shihezi Formation of Permian in Longdong Area,Ordos Basin. The results suggest that detrital mode compositions of these two members are similar,which were formed from the same parent rocks and tectonic setting. Microscopic characteristics and CL image of quartz show that the parent rocks are metamorphic rocks and igneous rocks;Light mineral characteristics are associated with collisional suture and fold-thrust belt sources. The plagioclase An and EPMA analysis indicate that the study area and the north Qinling orogenic belt have similar plagioclase type. Tectonic discrimination plots indicate that the provenance was mainly affected by passive continental margin source until the end of Late Paleozoic,then under the influence of active continental margin. Parent rock discrimination plots suggest that the provenance was dominated by felsic rocks. The REE distribution patterns of the sedimentary rock in Shan 1 and He 8 Members are consistently declining to the right,and are very similar to those of Qinling Group and Kuanping Group in the north Qinling orogenic belt. The dating of U-Pb isotope in zircon reveal that they can be divided into two groups according to their ages,which mostly dated from Proterozoic and some from Late Paleozoic. It is concluded that the provenance mainly affected by passive continental margin,others are active continental margin sources. Furthermore,the parent rocks of Shan 1 and He 8 Members are mainly from gneiss and quartzite of Qinling Group and chlorite schist and actinolite schist of Kuanping Group in the north Qinling orogenic belt,a few from igneous rocks of late Paleozoic era in the north Qinling orogenic belt.

Key words: petrology, geochemistry, parent rock type, tectonic setting, Shanxi Formation, Shihezi Formation, Longdong area, Ordos Basin

贺敬聪, 朱筱敏, 李明瑞, 刘芬, 叶蕾, 薛梦戈. 鄂尔多斯盆地陇东地区二叠系山西组—石盒子组母岩类型和构造背景[J]. 古地理学报, 2017, 19(2): 285-298.

He Jingcong, Zhu Xiaomin, Li Mingrui, Liu Fen, Ye Lei, Xue Mengge. Parent rock types and tectonic setting of the Permian Shanxi and Shihezi Formations in Longdong area,Ordos Basin[J]. JOPC, 2017, 19(2): 285-298.

http://www.gdlxb.cn/CN/Y2017/V19/I2/285

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[14]	丁晓琪, 田胤瑜, 雷涛, 张威, 李晓慧, 高景云. 吕梁古隆起对鄂尔多斯盆地马家沟组沉积的控制作用: 基于陕西府谷剖面^*[J]. 古地理学报, 2024, 26(3): 671-682.
[15]	李元昊, 史立川, 雷秀洁, 淡卫东. 鄂尔多斯盆地上三叠统延长组负载构造类型及特征^*[J]. 古地理学报, 2024, 26(2): 269-278.

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鄂尔多斯盆地陇东地区二叠系山西组—石盒子组母岩类型和构造背景

Parent rock types and tectonic setting of the Permian Shanxi and Shihezi Formations in Longdong area,Ordos Basin

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鄂尔多斯盆地陇东地区二叠系山西组—石盒子组母岩类型和构造背景

Parent rock types and tectonic setting of the Permian Shanxi and Shihezi Formations in Longdong area,Ordos Basin

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