青海同仁兰采地区花岗闪长岩LA-ICP-MS锆石U-Pb年代学、地球化学特征及其地质意义

doi:10.13278/j.cnki.jjuese.20180228

Abstract

Abstract: The geochemical characteristics and the LA-ICP-MS zircon U-Pb ages of the granodiorites in Lancai area, Tongren, Qinghai were studied,and the petrogenesis and tectonic significance were discussed. The results show that the crystallization age of Lancai granodiorite is (231.4±2.9) Ma (MSWD = 0.024). The ∑REE of the granitoide is 138.76×10^-6-197.19×10^-6. The REE patterns is rightward inclined with negative Eu anomaly. The trace element geochemistry is characterized evidently by the negative anomalies of Nb, Ta, Ti, Sr, Ba, P, etc. and positive anomalies of Rb, K, Th, U, etc. The granodiorites show the characteristics of metaluminous and belong to high-K calc-alkaline series. Lancai granodiorite is I-type granitoids. Based on the existing research results, Lancai granodiorite may be formed through partial melting of basic rocks in the crustal thickening geodynamic environment characterized mainly by compression on the whole and local shear extension,and the mantle-derived magmas may play an important role in the formation of the granodiorite.

Key words: granodiorites, geochemistry, zicon U-Pb dating, Lancai area, Qinghai

CLC Number:

P588.12

Ren Wenkai, Wang Shengyun, Chen Libiao, Wu Shaofeng, Zhang Haiqing. LA-ICP-MS Zicon U-Pb Geochronology, Geochemistry and Geological Significance of Granodiorites in Lancai Area, Tongren, Qinghai[J].Journal of Jilin University(Earth Science Edition), 2020, 50(4): 1059-1074.

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LA-ICP-MS Zicon U-Pb Geochronology, Geochemistry and Geological Significance of Granodiorites in Lancai Area, Tongren, Qinghai

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[2]	Ren Yunsheng, Liu Xiaohe, Shang Qingqing, Chen Cong, Yang Qun, Hao Yujie, Sun Zhenming. Geochemistry and Geochronology of Ore-Bearing Formation in Jinan BIF-Type Iron Deposit in Helong Area, Jilin Province [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(3): 800-814.
[3]	He Zhonghua, Wang Qizhi, Wang Qiang. Geochemistry and Zircon U-Pb Ages of Clastic Rocks of Zhesi Formation in Suolun Region, Great Xing’an Range: Constraints on Origins of Sediment Provenance [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(2): 405-424.
[4]	Meng Qingtao, Li Jinguo, Liu Zhaojun, Hu Fei, Xu Chuan. Organic Geochemical Characteristics and Depositional Environment of Oil Shale of Eocene of Paleocene Youganwo Formation in Yangjiao Mining Area of Maoming Basin [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(2): 356-367.
[5]	Xu Jinjun, Li Ning, Jin Qiang, Liu Jihua, Lou Da, Teng Jiancheng. Geochemical Characteristics and Source Analysis of Carboniferous-Permian Condensate Oil and Gas in Huanghua Depression [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(2): 644-652.
[6]	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.
[7]	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.
[8]	Song Yu, Liu Zhaojun, Achim Bechtel, Xu Yinbo, Meng Qingtao, Sun Pingchang, Zhu Kai. Controlling Factors of Oil Shale and Coal Oil Yield in Lower Cretaceous Muling Formation in Laoheishan Basin [J]. Journal of Jilin University(Earth Science Edition), 2020, 50(2): 378-391.
[9]	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.
[10]	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.
[11]	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.
[12]	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.
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