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;
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.
Received: 29 September 2016
Published: 01 April 2017
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.
Cite this article:
He Jingcong,Zhu Xiaomin,Li Mingrui et al. 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.
He Jingcong,Zhu Xiaomin,Li Mingrui et al. 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.
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