东昆仑五龙沟地区晚志留世A型花岗岩成因:U-Pb年代学、地球化学、Nd及Hf同位素制约

王艺龙; 李艳军; 魏俊浩; 李欢; 韩玉; 周红智; 黄啸坤; 柯坤家

doi:10.3799/dqkx.2018.717

Volume 43 Issue 4

Apr. 2018

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Article Navigation > Earth Science > 2018 > 43(4): 1219-1236

Wang Yilong, Li Yanjun, Wei Junhao, Li Huan, Han Yu, Zhou Hongzhi, Huang Xiaokun, Ke Kunjia, 2018. Origin of Late Silurian A-Type Granite in Wulonggou Area, East Kunlun Orogen: Zircon U-Pb Age, Geochemistry, Nd and Hf Isotopic Constraints. Earth Science, 43(4): 1219-1236. doi: 10.3799/dqkx.2018.717

Citation:

Wang Yilong, Li Yanjun, Wei Junhao, Li Huan, Han Yu, Zhou Hongzhi, Huang Xiaokun, Ke Kunjia, 2018. Origin of Late Silurian A-Type Granite in Wulonggou Area, East Kunlun Orogen: Zircon U-Pb Age, Geochemistry, Nd and Hf Isotopic Constraints. Earth Science, 43(4): 1219-1236. doi: 10.3799/dqkx.2018.717

Citation:

Wang Yilong, Li Yanjun, Wei Junhao, Li Huan, Han Yu, Zhou Hongzhi, Huang Xiaokun, Ke Kunjia, 2018. Origin of Late Silurian A-Type Granite in Wulonggou Area, East Kunlun Orogen: Zircon U-Pb Age, Geochemistry, Nd and Hf Isotopic Constraints. Earth Science, 43(4): 1219-1236. doi: 10.3799/dqkx.2018.717

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Origin of Late Silurian A-Type Granite in Wulonggou Area, East Kunlun Orogen: Zircon U-Pb Age, Geochemistry, Nd and Hf Isotopic Constraints

doi: 10.3799/dqkx.2018.717

Wang Yilong^{1,2
,},
Li Yanjun^{1,3
,
,},
Wei Junhao^1,3,
Li Huan¹,
Han Yu⁴,
Zhou Hongzhi¹,
Huang Xiaokun¹,
Ke Kunjia¹

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Geological Exploration Institute of Liaoning Province, Dalian 116100, China
3.
National Demonstration Center for Experimental Mineral Exploration Education, Wuhan 430074, China
4.
Qinghai No.1 Academy of Geology and Mineral Exploration, Ping'an 810600, China

Received Date: 2017-12-20
Publish Date: 2018-04-15

Abstract

Abstract

Late Silurian A-type granite is reported for the first time in the Wulonggou gold district, eastern segment of the Kunlun orogenic belt. This paper presents (1) laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U-Pb age for the Wulonggou A-type granite to determine precisely the time of the magmatism, (2) geochemical, Nd and Hf isotope data for the Wulonggou A-type granite to constrain the petrogenesis and tectonic setting. The LA-ICP-MS U-Pb analyses of zircon from the Wulonggou A-type granite yielded a weighted mean ²⁰⁶Pb/²³⁸U age of 420±3 Ma, indicating that it was emplaced in the Late Silurian. All rock samples are enriched in SiO₂ (76.0%-78.4%), K₂O (4.64%-5.22%) and Na₂O (2.93%-3.25%), but with relatively low concentrations of FeO^T (0.98%-1.45%), MgO (0.11%-0.22%) and CaO (0.27%-0.79%). Samples are also enriched in large ion lithophile elements (Rb, K, La) and light rare earth elements, but depleted in high field strength elements (Nb, P, Ti) and heavy rare earth elements with strong negative Eu anomalies (Eu/Eu^*=0.09-0.12). The 10⁴×Ga/Al ratios of the Wulonggou A-type granites vary from 3.09 to 3.15. Mineralogy and geochemistry of the rocks show an affinity with aluminous A-type granite. The ε_Nd(t) values of whole-rock range from -2.5 to -2.2 with corresponding two-stage Nd model ages ranging from 1 339 to 1 365 Ma. The ε_Hf(t) values of zircon vary from -2.8 to +2.1 and two-stage Hf model ages range from 1 269 to 1 583 Ma. The Nd and Hf isotopic data imply that different source materials have contributed to the magma genesis. Integrated geological, geochemical and isotopic data suggest that Wulonggou A-type granite is most likely generated via the mixture of asthenosphere-derived magma and the ancient crustal materials. The A-type granite was marked by A₂ type and was formed in post-collisional extensional tectonic environment. In combination with the A-type granites such as those in the Helegangnaren and Binggou, it is concluded that the eastern Kunlun area had begun its post-orogenic extension stage since Late Silurian, and this stage continued at least about 34 Ma.
- A-type granite,
- Late Silurian,
- petrogenesis,
- post-collisional extensional setting,
- East Kunlun orogen,
- petrology,
- geochemistry

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References(134)

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