Detrital zircon geochronology and tectonic implications of the Mesoproterozoic Gaoshanhe Group in south margin of North China Craton
Wang Miao1, Zhou Hong-Rui1, Zhang Heng2
1 School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China; 2 Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China
Abstract In order to investigate the age attribution of the Mesoproterozoic sedimentary strata,regional paleogeographic pattern and tectonic evolution in the southern margin of the North China Craton(NCC),this study reports U-Pb geochronology and characteristics of trace elements of detrital zircons from the Gaoshanhe Group in the Lingbao-Fudi area of the western Henan Province. The 207Pb/206Pb age of the youngest zircon of the Gaoshanhe Group is 1685±39 Ma,which limited the earliest sedimentary age of the Gaoshanhe Group is no earlier than 1700 Ma. Combined with the chronological calibration of the Longjiayuan Formation(1594±12 Ma)overlying the Gaoshanhe Group,the age of the Gaoshanhe Group was limited to 1700-1600 Ma,which is the middle and late period of the Mesoproterozoic Changcheng period,corresponding to the international Statherian Period. The 207Pb/206Pb ages of the detrital zircons from the Gaoshanhe Group range from 1685 Ma to 2751 Ma,presenting four age peaks of 1850 Ma,2150 Ma,2300 Ma and 2500 Ma,corresponding to the Paleoproterozoic geological events of the North China Craton. The provenance of the Gaoshanhe Group is dominated by geological body of the 1850 Ma peak age and the 2500 Ma peak age. According to thecomparison of age frequency of detrital zircons in the Gaoshanhe Group and Yunmengshan Formations,it is speculated that there are 2500 Ma geological bodies reported less frequently in the west of the western Henan area. According to the geochemical characteristics of the Xionger Group volcanic rocks and their corresponding zircons,the basin dynamic property during the deposition of the Xionger Group,and the sedimentary properties of the Gaoshanhe Group and tectonic property of the sedimentary basin,the Xionger Group was most likely formed in the post-arc basin symbiotic with “island arcs” and the Gaoshanhe Group overlying the Xionger Group was deposited near the shore and shallow sea of passive continental marginal and close to the continental side of the back-arc basin.
Corresponding Authors:
Zhou Hong-Rui, born in 1958, is a professor and Ph.D. supervisor. He is mainly engaged in teaching and researches of sedimentology and stratigraphy. E-mail: Zhouhr@cugb.edu.cn.
About author: Wang Miao,born in 1993,is a master student. He is mainly engaged in petrology and sedimentology research. E-mail: 1623385801@qq.com.
Cite this article:
Wang Miao,Zhou Hong-Rui,Zhang Heng. Detrital zircon geochronology and tectonic implications of the Mesoproterozoic Gaoshanhe Group in south margin of North China Craton[J]. JOPC, 2020, 22(1): 39-55.
Wang Miao,Zhou Hong-Rui,Zhang Heng. Detrital zircon geochronology and tectonic implications of the Mesoproterozoic Gaoshanhe Group in south margin of North China Craton[J]. JOPC, 2020, 22(1): 39-55.
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