Characteristics and genesis of iron formation in the Changlongshan Formation of Qingbaikou System in the Ming Tombs area,Beijing
Zhang Qin1,2, Wang Bo-Han3, Zhou Chen1, Sun Zu-Yu1, Mei Xiao-Han4, Yuan Cheng-Shuai5, Wang Kai1
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249, China; 2 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249, China; 3 Jianghan Production Plant of Sinopec Jianghan Oilfield Company,Hubei Qianjiang 433123, China; 4 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China; 5 Institute of Earth Science,China University of Geosciences(Beijing),Beijing 100083,China
Abstract Iron formation is widely distributed through the entire Precambrian geological record,however,there is no report on the outcropped Precambrian iron formation in the Changlongshan Formation of the Qingbaikou System in North China. Based on field investigation,XRD,SEM,ICP-MS and other methods,the distribution and mineral composition of iron formation and the source of ore-forming materials outcropped in the Ming Tombs area were studied in this paper to investigate the genesis of iron formation. The study showed that the main component of iron formation was hematite,which was associated with quartz,glauconite and other minerals. The iron formation of the Changlongshan Formation was divided into two types. Type I is associated with glauconite with relatively smaller thickness,and it is characterized by bands of glauconite sandstone interbeded with iron sandstone and near-spherical hematite microscopically. Type II is not accompanied by glauconite with relatively larger thickness,and it is represented by black iron-rich layers intercalated with quartz lens and acicular or snowflake hematite under the microscope. Tectonic evolution and trace element analysis showed that the iron source was mainly derived from the irony weathering crust at the top of the Xiamaling Formation. The type I iron formation is a mixture of chemical colloid and glauconite weathering,and the type II iron formation is mainly formed by colloidal chemical deposition and could undergo mylonitization in the later stage. The research results provide a sedimentary geological basis for distribution and prospecting of the Precambrian iron formation in North China,and it is also of great significance for enriching the metallogenic mechanism of the iron formation and revealing the tectonic evolution of Proterozoic of North China.
Fund:Financially supported by the National Natural Science Foundation of China(No.41872134)
About author: About the first author Zhang Qin,born in 1973,is an associate professor and graduate supervisor. She is mainly engaged in sedimentology,sequence stratigraphy and reservoir geology. E-mail: zhangqin@cup.edu.cn.
Cite this article:
Zhang Qin,Wang Bo-Han,Zhou Chen et al. Characteristics and genesis of iron formation in the Changlongshan Formation of Qingbaikou System in the Ming Tombs area,Beijing[J]. JOPC, 2020, 22(3): 570-586.
Zhang Qin,Wang Bo-Han,Zhou Chen et al. Characteristics and genesis of iron formation in the Changlongshan Formation of Qingbaikou System in the Ming Tombs area,Beijing[J]. JOPC, 2020, 22(3): 570-586.
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