内蒙古科尔沁右翼中旗三叠纪花岗质岩锆石U-Pb年龄、地球化学特征及其地质意义

doi:10.13278/j.cnki.jjuese.201502107

Abstract

Abstract:

Based on the Zircon U-Pb dating and geochemical data obtained for the granite in Keerqinyouyizhongqi Inner Mongolia, we discussed the granite types and regional tectonic evolution. The biotite granite and granodiorite are mainly developed in the area. They are enriched in SiO₂,Al₂O₃, and alkali, and belong to high potassium peraluminous calc-alkaline series of S type granite. The rare earth element normalized distribution diagram shows that LREE are highly concentrated, while HREE are relatively depleted with the ratio of LREE/HREE between 3.12 and 16.17, an average of 10.07; the ratio of La_N and Yb_N is between 2.72 and 28.71, Eu anomaly is moderate negative; enrichment of rock large ion lithophile Rb, K and Pb, depletion of high field strength elements Nb, Ta, Zr, Ce, Ti, the feature of collision type granite. These granitics could be distinguished by their low-Sr and low-Yb based on the geochemical characteristics, which shows that the granitics are likely formed under high pressure. The Zircon U-Pb age (242.6±2.5) Ma, suggests that the paleo Asian Ocean subduction collision occurred in Triassic period, the formation of granite rock mass related to the collision split.

Key words: zircon U-Pb age, granite, geochemical, Triassic, keerqinyouyizhongqi

CLC Number:

Zhang Haihua, Zheng Yuejuan, Chen Shuwang, Li Yongfei, Zhang Jian, Bian Xiongfei, Su Fei, Gong Fanhao, Huang Xin. Zircon U-Pb Age, Geochemical Characteristics and Geological Significance of the Triassic Granite in Keerqinyouyizhongqi, Inner Mogolia[J].Journal of Jilin University(Earth Science Edition), 2015, 45(2): 417-428.

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Zircon U-Pb Age, Geochemical Characteristics and Geological Significance of the Triassic Granite in Keerqinyouyizhongqi, Inner Mogolia

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[8]	Yang Fengchao, Song Yunhong, Zhao Yuyan. Zircon SHRIMP U-Pb Age and Hf Isotope of Granite in Panling Ore Concentration Area in Liaoning and Its Geological Significance [J]. Journal of Jilin University(Earth Science Edition), 2017, 47(5): 1429-1441.
[9]	Xi Aihua, Wang Mingzhi, Ge Yuhui, Li Bile, Wang Quan, Zhu Qian. Geochemistry and Geological Significance of Granite Porphyry in Wudaoling, Heilongjiang Province [J]. Journal of Jilin University(Earth Science Edition), 2017, 47(4): 1159-1171.
[10]	Xiao Fan, Chen Jianguo. Application of PPC Model Combined with RCGA to Identify and Extract Geochemical Anomaly [J]. Journal of Jilin University(Earth Science Edition), 2017, 47(4): 1319-1330.
[11]	Ye Lin, Liu Yuping, Zhang Qian, Bao Tan, He Fang, Wang Xiaojuan, Wang Dapeng, Lan Jiangbo. Trace and Rare Earth Elements Characteristics of Sphalerite in Dulong Super Large Sn-Zn Polymetallic Ore Deposit, Yunnan Province [J]. Journal of Jilin University(Earth Science Edition), 2017, 47(3): 734-750.
[12]	Yang Mei, Sun Jinggui, Wang Zhongyu, Zhao Shifeng, Liu Chen, Feng Yangyang, Ren Zening. Petrogenesis and Geological Significance of the Alkali-Rich Granite Porphyry in the Jiawula Cu-Ag-Pb-Zn Deposit in the Western Slope of the Great Xing'an Range: Zircon U-Pb Dating and Geochemical Characteristics [J]. Journal of Jilin University(Earth Science Edition), 2017, 47(2): 477-496.
[13]	Dong Weihong, Meng Ying, Wang Yushan, Wu Xiancang, Lü Ying, Zhao Hui. Hydrochemical Characteristics and Formation of the Shallow Groundwater in Fujin,Sanjiang Plain [J]. Journal of Jilin University(Earth Science Edition), 2017, 47(2): 542-553.
[14]	Cui Jianjun, Wang Yanhong, Zheng Guanggao, Shi Wei, Ma Licheng. The Timing of the Formation and Exhumation of the Dawu Complex in West Dabie Orogen, East China, and Its Geological Significance [J]. Journal of Jilin University(Earth Science Edition), 2017, 47(1): 139-153.
[15]	Cheng Wenbin, Yin Li, Chen Cuihua, Song Yukun, Li Guanqing, Zhang Xingguo, Xia Baoben, Dawa Ciren. Geochemical Characteristics of Primary Halos in No. I Ore Body of Keyue Pb-Zn-Sb-Ag Polymetallic Deposit, Tibet [J]. Journal of Jilin University(Earth Science Edition), 2016, 46(6): 1711-1723.