东昆仑祁漫塔格阿确墩地区侵入岩U-Pb年代学、地球化学及其地质意义

李婷; 李猛; 胡朝斌; 李瑶; 孟杰; 高晓峰; 查显锋

doi:10.3799/dqkx.2018.224

Volume 43 Issue 12

Dec. 2018

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Article Navigation > Earth Science > 2018 > 43(12): 4350-4363

Li Ting, Li Meng, Hu Chaobin, Li Yao, Meng Jie, Gao Xiaofeng, Zha Xianfeng, 2018. Zircon U-Pb Geochronology, Geochemistry and Its Geological Implications of Intrusions in Aquedun Area from Qimantag, East Kunlun, China. Earth Science, 43(12): 4350-4363. doi: 10.3799/dqkx.2018.224

Citation:

Li Ting, Li Meng, Hu Chaobin, Li Yao, Meng Jie, Gao Xiaofeng, Zha Xianfeng, 2018. Zircon U-Pb Geochronology, Geochemistry and Its Geological Implications of Intrusions in Aquedun Area from Qimantag, East Kunlun, China. Earth Science, 43(12): 4350-4363. doi: 10.3799/dqkx.2018.224

Citation:

Li Ting, Li Meng, Hu Chaobin, Li Yao, Meng Jie, Gao Xiaofeng, Zha Xianfeng, 2018. Zircon U-Pb Geochronology, Geochemistry and Its Geological Implications of Intrusions in Aquedun Area from Qimantag, East Kunlun, China. Earth Science, 43(12): 4350-4363. doi: 10.3799/dqkx.2018.224

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Zircon U-Pb Geochronology, Geochemistry and Its Geological Implications of Intrusions in Aquedun Area from Qimantag, East Kunlun, China

doi: 10.3799/dqkx.2018.224

Li Ting^{1,2
,},
Li Meng^1,2,
Hu Chaobin^1,2,
Li Yao^1,2,
Meng Jie^1,2,
Gao Xiaofeng^1,2,
Zha Xianfeng^1,2

1.
Xi'an Center of Geological Survey, Orogen Research Center, China Geological Survey, Xi'an 710054, China
2.
Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Natural Resources, Xi'an 710054, China

Received Date: 2018-06-29
Publish Date: 2018-12-15

Abstract

Abstract

The determination of formation time and tectonic setting of intrusions in Qimantag area can limit the time of Caledonian tectonic evolution in East Kunlun orogen. Zircon U-Pb geochronology, geochemistry of quartz diorite and monzonite adamellite in Aquedun of northwestern Qimantag area are studied in this paper. Results show that quartz diorite belongs to metaluminous-weakly peraluminous and calc-alkaline series of I-type granite, with moderate Eu negative abnormality (δEu=0.79-0.90) and significant fractionation between light REE and heavy REE, enriched in Rb, K, Hf, Zr, Tb, Nd and depleted of Ba, P, Ti, Nd, Ta, Y.Monzonite adamellite belongs to weakly peraluminous and calc-alkaline series of high-fractionated I-type granite, with significant negative Eu abnormality (δEu=0.42-0.45) and significant fractionation between light REE and heavy REE, enriched in LILE(Rb, K, La, Ce, Nd, Tb) and depleted in HFSE(P, Ti, Nd, Ta) and Ba, Sr, U.The ratios of Nd/Th, Nb/Ta and Mg^# of quartz diorite show crustal characteristics with the addition of small amount of mantle-derived materials, produced by partial melting of the continental crust induced by mantle derived magmas underplating. The ratios of Nd/Th, Nb/Ta and Mg^# of monzonite adamellite show crustal characteristics, produced by partial melting of the upper continental crust induced by mantle derived magmas underplating and may have experienced the fractional crystallization at the same time. Zircon LA-ICP-MS U-Pb age of the quartz diorite and monzonite adamellite are 448.8±3.9 Ma and 405.2±3.6 Ma, respectively, which represents their formation time. The chemical characteristics of quartz diorite are closely related to the island-arc environments in subduction belt.Monzonite adamellite falls into the zone of collision setting with tectonic setting discrimination diagrams, but the trace elements do not match with typical collision-orogenic granite, so we think monzonite adamellite is post-collision-orogenic granite.Combined with the regional tectonic evolution, it is concluded that Qimantag block of East Kunlun orogen maybe is in the subduction stage in Late Ordovician, and in the post-collision stage before Early Devonian.
- East Kunlun orogen,
- Qimantag,
- Aquedun area,
- intrusion,
- zircon U-Pb dating,
- geochemistry

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References(85)

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Zircon U-Pb Geochronology, Geochemistry and Its Geological Implications of Intrusions in Aquedun Area from Qimantag, East Kunlun, China

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