2021, 40(1) 41-51 DOI:     ISSN: 1004-5589 CN: 22-1111/P

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Keywords
 geochemical characteristics
I type granites
Xinhure area
Urad Zhongqi
Inner Mongolia Paleo - Asian Ocean
Authors
PubMed

 Geochemical characteristics and geological significance of Permian granites in Xinhure area of Urad Zhongqi,Inner Mongolia

 

 1. Division of Geology and Mineral Resources,Beijing Research Institute of Uranium Geology,Beijing 100029,China;

2. Key Laboratory of Nuclear Resources and Environment,East China University of Science and Technology,Nanchang 330013,China

Abstract

 In order to further understand the closure time limit of the Paleo - Asian Ocean,the Urad Zhongqi region in Inner Mongolia,located in the northern margin of the North China Craton and south of the Suolun Mountain suture zone,was selected as the research area. The study of the whole-rock geochemistry of Permian biotite

granite and monzogranite exposed in the Xinhure area of the Urad Zhongqi region was carried out. The results show that the Permian granite is a series of weak peraluminous alkaline-calcium rocks,which is rich in silicon,potassium
and low in phosphorus. LREE and trace elements K,Rb,Ba are enriched,HREE and Nb,Ta,P,Ti are depleted,with weak negative europium anomaly. It belongs to high-differentiation I type granites. According to the geotectoniclocation of the study area,age and geochemical characteristics of the rocks,it is suggested that the formation of the granite occurred during the subduction of the Paleo - Asian Ocean and transition to collision in the Middle Permian.

Keywords  geochemical characteristics   I type granites   Xinhure area   Urad Zhongqi   Inner Mongolia Paleo - Asian Ocean  
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