大兴安岭下嘎来奥伊铅锌矿床钾长花岗岩的岩石成因及地质意义

doi:10.13278/j.cnki.jjuese.20190205

Abstract

Abstract: Xiagalaiaoyi Pb-Zn deposit is located in the west section of the intersection line between the south edge of the Erguna block Ermul Mountain uplift and the north margin of the Great Xing’an Range volcanic belt, northwest of Heilongjiang Province. Non-contemporaneous intrusive rocks are widely distributed in Xiagalaiaoyi district, and the ore bodies occur in the intermediate-acrid hypabyssal intrusive rocks and their contact zone with marble. LA-ICP-MS zircon U-Pb dating results show that the diagenetic age of moyite is (168.9±2.1) Ma-(165.9±2.1) Ma, suggesting that the metallogenic age of Xiagalaiaoyi Pb-Zn deposit is Middle Jurassic. Based on the geochemical data, the moyite belongs to quasi-aluminous to weakly per-aluminous alkaline A-type granite,which is characterized by high Si, K and alkali, poor Al, A/CNK value of 0.97-1.02, and the saturation temperature of zircons ranges from 760 to 851℃ (average 811℃). The granite exhibits weakly negative Eu anomalies (δEu=0.01-0.27), enrichment of LREE, large ion lithophile elements (such as Rb and K), high-field strength elements (such as Th, U, Zr and Hf), and depletion of HREE and high-field strength elements (such as P, Ti, Nb and Ta). The rocks belong to low-Sr and high-Yb type granites with Sr (13.20-62.80)×10^-6(average 38.95×10^-6)and Yb(2.44-7.81)×10^-6(average 4.50×10^-6). Combined with the relevant regional tectonic evolution research, we conclude that the moyite formation is closely related to the extensional environment after the closure of the Mongolia Okhotsk Ocean during Middle Jurassic.

Key words: A-type granite, moyite, geochronology, Middle Jurassic, geochemistry, extensional environment, Xiagalaiaoyi Pb-Zn deposit

CLC Number:

P588.12

Yu Changsheng, Yang Yanchen, Han Shijiong, Yang Kunlin, Song Zhaoyang, Zhang Yihang, Wang Wang. Petrogenesis of Moyite from Xiagalaiaoyi Pb-Zn Deposit in Great Xing’an Range and Its Geological Significance[J].Journal of Jilin University(Earth Science Edition), 2020, 50(4): 1042-1058.

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Petrogenesis of Moyite from Xiagalaiaoyi Pb-Zn Deposit in Great Xing’an Range and Its Geological Significance

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[8]	Zhang Jian, Zhang Haihua, Chen Shuwang, Zheng Yuejuan, Zhang Dejun, Su Fei, Huang Xin. Geochemical Characteristics and Geological Significance of Upper Permian Linxi Formation in Northern Songliao Basin [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(2): 518-530.
[9]	Chen Huijun, Yu Hongbin, Ma Yongfei, Chen Jingsheng, Qian Cheng, Liu Shiwei, Cui Tianri, Zhong Hui. Zircon U-Pb Age, Petrological Geochemistry and Tectonic Implication of Alkaline Granitein South-Eastern Jilin Province [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(2): 531-541.
[10]	Zhang Shuyi. Geochronology and Geochemistry of Volcanic Rocks in Tamulangou Formation from New Barag Right Banner, Inner Mongolia [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(1): 129-138.
[11]	Xu Zhongjie, Kong Jintao, Cheng Rihui, Li Shuanglin, Kong Yuan, Yu Zhenfeng. Geochemical and Carbon and Oxygen Isotope Records of Relative Sea-Level Change of Mufushan Formation in Early Cambrian in Nanjing, Lower Yangtze Region [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(1): 158-169.
[12]	Cheng Long, Ding Qingfeng, Deng Yuanliang, Song Kai, Zhang Qiang. Petrogenesis of Middle Triassic Diabase Veins in Wulonggou Ore Concentrated Areas Within East Kunlun Orogen: Chronology, Geochemistry and Tectonic Significance [J]. Journal of Jilin University(Earth Science Edition), 2019, 49(6): 1628-1648.
[13]	Lei Ruxiong, Zhao Tongyang, Li Ping, Dong Lianhui, Li Jihong, Wu Changzhi. H-O-S-Pb Isotopic Geochemistry of Dapinggou Gold Deposit in Northern Altun and Its Implications for Ore Genesis [J]. Journal of Jilin University(Earth Science Edition), 2019, 49(6): 1578-1590.
[14]	Long Tianxiang, He Xiaohu, Liu Fei, Li Zongyong, Wang Yuchao, Zhao Jun, Li Yunfei, Wang Changbing, Cao Yuan. Zircon U-Pb Geochronology, Trace Element, Hf Isotope of Alkaline Rocks from Chang'an Gold Deposit and Its Geological Implication [J]. Journal of Jilin University(Earth Science Edition), 2019, 49(6): 1607-1627.
[15]	Chen Qingsong, Yang Runbai, Liu Demin, Tao Lanchu. Petrogenesis and Sedimentary Environment of Cherts of Dengying Formation in Huize County, Northeastern Yunnan: Evidence from Petrology and Geochemistry [J]. Journal of Jilin University(Earth Science Edition), 2019, 49(5): 1327-1337.