东昆仑五龙沟矿集区中三叠世辉绿岩脉的岩石成因:年代学、地球化学特征及其构造意义

doi:10.13278/j.cnki.jjuese.20190068

Abstract

Abstract: Through a LA-ICP-MS U-Pb dating of zircons from four diabase dykes in Wulonggou ore concentrated areas, we found that the most zircons are the inherited zircons. The zircons with the latest age represent those from the magmatic crystallization of diabase veins with an average age of (242.8±2.1) Ma (the Middle Triassic). The four diabase dykes are calc-alkaline -high calc-alkaline with w(SiO₂) range of 42.82%-52.94%,w(Na₂O) range of 1.98%-4.51% and w(K₂O) range of 0.70%-2.04%. V, Cr, Ni and the other trace elements in the four dikes are positively correlated with MgO mass fraction, and the mass fraction is small. This results indicate that the fractional crystallizations of the olivine and pyroxene occurred during the magmatic process. The trace elements are characterized by relatively rich in LILE (Rb, Ba, Eu), LREE, depleted of HFSE, Nb/La is 0.39-0.50, Nb/Ta is 12.16-16.69, and Zr/Hf is 45.82-47.06. These features are quite different from those of the magma derived from the depleted asthenosphere mantle. In conclusion, the Middle Triassic diabase dikes in Wulonggou ore concentrated areas may be derived from the partial melting of the lithospheric mantle, reconstructed by the subduction plate fluids and contaminated by the crust.

Key words: Wulonggou ore concentrated areas, diabase dykes, Middle Triassic, chronology, geochemistry, lithospheric

CLC Number:

P588.124

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.

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Petrogenesis of Middle Triassic Diabase Veins in Wulonggou Ore Concentrated Areas Within East Kunlun Orogen: Chronology, Geochemistry and Tectonic Significance

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[7]	Yu Jielu, Yu Jiejiang, Yang Wanzhi, Zhang Yuanhou, Guo Xiuwei. Geochronology, Geochemistry and Tectonic Implications of Early Silurian Intermediate-Acid Intrusive Rocks in East of Jueluotage Belt, Eastern Tianshan [J]. Journal of Jilin University(Earth Science Edition), 2019, 49(3): 690-708.
[8]	Wang Chunguang, Dong Xiaojie, Xu Zhongyuan, Ren Yunwei, Wang Wenlong, Chen Yusong. Chronology and Geochemistry of Neoarchean Metamorphic Intrusive Rocks in Hongshanzi, Inner Mongolia [J]. Journal of Jilin University(Earth Science Edition), 2019, 49(3): 709-726.
[9]	Lu Qian, Sun Jinggui, An Jiuhai, Han Jilong, Chu Xiaolei. Petrogenesis and Forming Environment of Mesozoic Porphyritic Granite in Songjianghe Region of Dunhua,Jilin Province: Evidences from Element Geochemistry,Hf Isotope and U-Pb [J]. Journal of Jilin University(Earth Science Edition), 2019, 49(3): 673-689.
[10]	Yan Ketao, Guo Qinghai, Liu Mingliang. Geochemical Anomalies of Arsenic and Its Speciation in Daggyai Geothermal Springs, Tibet [J]. Journal of Jilin University(Earth Science Edition), 2019, 49(2): 548-558.
[11]	Zhang Zhibo, Zhu Zhijun, Wang Wenfeng, Xu Ying, Li Lirong. Geochemical Characteristics and Formation Environment of Mesozoic and Cenozoic Evaporative Rocks in Lanping Basin, Western Yunnan [J]. Journal of Jilin University(Earth Science Edition), 2019, 49(2): 356-379.
[12]	Wu Yongtao, Han Runsheng. C, O, Sr Isotope and REE Geochemistry of Maozu Pb-Zn Deposit in Northeastern Yunnan Mineral Concentration Area [J]. Journal of Jilin University(Earth Science Edition), 2019, 49(2): 400-413.
[13]	Qin Ya, Yang Qijun, Li Cheng, Zhou Shuqi, Xu Haotian. Constraints on Metallogenic Time and Time-Space Serial of Igneous Rocks of Fozichong Ore Field in Guangxi Zhuang Autonomous Region [J]. Journal of Jilin University(Earth Science Edition), 2019, 49(2): 425-444.
[14]	Zhang Chao, Wu Xinwei, Zhang Yujin, Guo Wei, Quan Jingyu. U-Pb Chronology of Mesozoic Volcanic Rocks from Longjiang Basin and Their Constraints on Basement [J]. Journal of Jilin University(Earth Science Edition), 2019, 49(2): 460-476.
[15]	Yin Zhengxin, Wang Haifeng, Han Jinsheng, Lü Xiuya, Shen Zezhong, Chen Jing, He Huizhong, Xie Anyuan, Guan Yao, Dong Chao. Comparison Between the Marginal-Sea Polymetallic Nodules in South China Sea and Ocean Polymetallic Nodules [J]. Journal of Jilin University(Earth Science Edition), 2019, 49(1): 261-277.