青海省赛支寺花岗闪长岩及其暗色包体成因：锆石U-Pb年代学、岩石地球化学和Sr-Nd-Hf同位素制约

崔加伟; 郑有业; 孙祥; 吴松; 高顺宝; 田立明; 孙君一; 杨超

doi:10.3799/dqkx.2016.515

Volume 41 Issue 7

Jul. 2016

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Article Navigation > Earth Science > 2016 > 41(7): 1156-1170

Cui Jiawei, Zheng Youye, Sun Xiang, Wu Song, Gao Shunbao, Tian Liming, Sun Junyi, Yang Chao, 2016. Origin of Granodiorite and Mafic Microgranular Enclave in Saizhisi, Qinghai Province: Zircon U-Pb Geochronological, Geochemical and Sr-Nd-Hf Isotopic Constraints. Earth Science, 41(7): 1156-1170. doi: 10.3799/dqkx.2016.515

Citation:

Cui Jiawei, Zheng Youye, Sun Xiang, Wu Song, Gao Shunbao, Tian Liming, Sun Junyi, Yang Chao, 2016. Origin of Granodiorite and Mafic Microgranular Enclave in Saizhisi, Qinghai Province: Zircon U-Pb Geochronological, Geochemical and Sr-Nd-Hf Isotopic Constraints. Earth Science, 41(7): 1156-1170. doi: 10.3799/dqkx.2016.515

Citation:

Cui Jiawei, Zheng Youye, Sun Xiang, Wu Song, Gao Shunbao, Tian Liming, Sun Junyi, Yang Chao, 2016. Origin of Granodiorite and Mafic Microgranular Enclave in Saizhisi, Qinghai Province: Zircon U-Pb Geochronological, Geochemical and Sr-Nd-Hf Isotopic Constraints. Earth Science, 41(7): 1156-1170. doi: 10.3799/dqkx.2016.515

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Origin of Granodiorite and Mafic Microgranular Enclave in Saizhisi, Qinghai Province: Zircon U-Pb Geochronological, Geochemical and Sr-Nd-Hf Isotopic Constraints

doi: 10.3799/dqkx.2016.515

1.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
Beijing Zhongkaihongde Technology Co., Ltd., Beijing 100083, China

Received Date: 2015-11-22
Publish Date: 2016-07-15

Abstract

Abstract

The Qilian orogenic belt is divided into the North, Central and South Qilian belts. The Saizhisi granodiorite is located between Central and South Qilian. In order to study the petrogensis and dynamic background of Saizhisi rocks, zircon U-Pb chronology, Hf isotope, whole rock geochemistry and Sr-Nd isotopes are reported for granodiorite and mafic microgranular enclaves (MMEs) in this area. The LA-ICP-MS analyses on zircons from both the Saizhisi granodiorite and MMEs yielded similar ages at 446.1±1.3 Ma and 446.0±1.0 Ma, respectively. The MMEs contain needle-like apatite, and they are characterized by lower SiO₂ contents and higher Na₂O/K₂O ratios. Their REEs are similar to those of Saizhisi granodiorite and ∑REE are lower than those of the host granodiorite; The ⁸⁶Sr/⁸⁷Sr of MMEs=0.706 4-0.706 7, the ε_Nd(t) of MMEs=-7.38 to -7.97. The elemental, U-Pb dating and Sr-Nd isotope suggest that they might have been formed by mixing of mafice and felsic member magmas. The Saizhisi granodiorite is metaluminous to weakly peraluminous with SiO₂=66.45%-68.12%, Na₂O/K₂O=0.80-0.97, and A/CNK=0.91-1.03. The granodiorite is enriched in LILEs and depleted in HFSE, enriched in LREE contents and depleted in HREE contents with negative Euanomaly. The ⁸⁶Sr/⁸⁷Sr(0.709 3-0.709 5) and ε_Nd(t) (-7.3794--7.9674) of Saizhisi granodiorite is similar to those of I-type granite of the Qilian Orogen belt. The ε_Hf(t) of Saizhisi granodiorite=1.7-6.8, T_DM2=995-1 750 Ma. It is concluded that the Saizhisi granodiorite might have been formed by mixing of mafice and felsic member magmas. Combined with the regional tectonic evolution, it is suggested that the Saizhisi granodiorite was formed in a subduction environment and mostly generated by the mantle which was formed by the lower crust intruded by the upwelling mantle.
- MMEs,
- Magma mixing,
- Early Paleozoic,
- Saizhisi granodiorite,
- Central-South Qilian,
- zircon,
- isotopes,
- geochronology

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References(50)

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Origin of Granodiorite and Mafic Microgranular Enclave in Saizhisi, Qinghai Province: Zircon U-Pb Geochronological, Geochemical and Sr-Nd-Hf Isotopic Constraints

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