The magma records and mineralization of early subduction of Neo-Tethyan oceanic slab: Zircon U-Pb and Hf isotopic composition of granitoids in the northwest of Xigaza

FU Yangang; TANG Juxing; HU Guyue; GAO Yiming; LIN Bin

2018 Vol. 37, No. 6

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FU Yangang, TANG Juxing, HU Guyue, GAO Yiming, LIN Bin. The magma records and mineralization of early subduction of Neo-Tethyan oceanic slab: Zircon U-Pb and Hf isotopic composition of granitoids in the northwest of Xigaza[J]. Geological Bulletin of China, 2018, 37(6): 1026-1036.

Citation:

FU Yangang, TANG Juxing, HU Guyue, GAO Yiming, LIN Bin. The magma records and mineralization of early subduction of Neo-Tethyan oceanic slab: Zircon U-Pb and Hf isotopic composition of granitoids in the northwest of Xigaza[J]. Geological Bulletin of China, 2018, 37(6): 1026-1036.

The magma records and mineralization of early subduction of Neo-Tethyan oceanic slab: Zircon U-Pb and Hf isotopic composition of granitoids in the northwest of Xigaza

1.
Key Laboratory of Geochemical Exploration, Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, Hebei, China
2.
MRL Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China

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Corresponding author: TANG Juxing, tangjuxing@126.com

Received Date: 20 February 2017

Revised Date: 23 March 2017

Publish Date: 25 June 2018

Abstract

Abstract

The Late Triassic-Middle Jurassic magmatic rocks distributed sporadically in the south of Lhasa terrane are considered to be the magmatic records of the early subduction of the Neo-Tethys. In addition, Xiongcun porphyry copper system was associated with the magma. Therefore, research on the Late Triassic-Jurassic magmatic can help to evaluate its metallogenic potential. This pa-per reports LA-ICP MS zircon U-Pb age and in situ Hf isotopic compositions of the granodiorite in the northwest of Xigaza. The obtained U-Pb zircon age of the granodiorite is 175～180.1Ma. Zircon Hf isotopic compositions of the granodiorite display ε_Hf(180.1Ma)=(+13.4), which shows the characteristics of mantle source with an affinity for island arc which was capable of forming the porphyry Cu-Au system. Therefore, the Late Triassic-Cretaceous volcanic rocks in the south of Lhasa terrane have the potential for exploration of the porphyry Cu-Au system.
- Neo-Tethys /
- Late Triassic-Middle Jurassic magmatic rocks /
- porphyry Cu-Au system /
- island-arc

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References

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