Petrogenesis and Ore Genesis of the Late Yanshanian Granites and Associated Porphyry-Skarn W-Mo Deposits from the Yunkai Area of South China:Evidence from the Zircon U-Pb Ages, Hf Isotopes and Sulfide S-Fe Isotopes

Xinyu Wang; Zhen Yang; Nengsong Chen; Rui Liu

doi:10.1007/s12583-017-0901-1

Volume 29 Issue 4

Jul 2018

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Journal of Earth Science > 2018 > 29(4): 939-959.

Xinyu Wang, Zhen Yang, Nengsong Chen, Rui Liu. Petrogenesis and Ore Genesis of the Late Yanshanian Granites and Associated Porphyry-Skarn W-Mo Deposits from the Yunkai Area of South China:Evidence from the Zircon U-Pb Ages, Hf Isotopes and Sulfide S-Fe Isotopes. Journal of Earth Science, 2018, 29(4): 939-959. doi: 10.1007/s12583-017-0901-1

Citation:

Xinyu Wang, Zhen Yang, Nengsong Chen, Rui Liu. Petrogenesis and Ore Genesis of the Late Yanshanian Granites and Associated Porphyry-Skarn W-Mo Deposits from the Yunkai Area of South China:Evidence from the Zircon U-Pb Ages, Hf Isotopes and Sulfide S-Fe Isotopes. Journal of Earth Science, 2018, 29(4): 939-959. doi: 10.1007/s12583-017-0901-1

Citation:

Xinyu Wang, Zhen Yang, Nengsong Chen, Rui Liu. Petrogenesis and Ore Genesis of the Late Yanshanian Granites and Associated Porphyry-Skarn W-Mo Deposits from the Yunkai Area of South China:Evidence from the Zircon U-Pb Ages, Hf Isotopes and Sulfide S-Fe Isotopes. Journal of Earth Science, 2018, 29(4): 939-959. doi: 10.1007/s12583-017-0901-1

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Petrogenesis and Ore Genesis of the Late Yanshanian Granites and Associated Porphyry-Skarn W-Mo Deposits from the Yunkai Area of South China:Evidence from the Zircon U-Pb Ages, Hf Isotopes and Sulfide S-Fe Isotopes

doi: 10.1007/s12583-017-0901-1

1.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Geological Prospecting Institute of Guangxi Zhuang Autonomous Region, Nanning 530023, China
3.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

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Corresponding author: Zhen Yang
Received Date: 03 Apr 2015
Accepted Date: 10 Dec 2016
Publish Date: 01 Aug 2018

Abstract

Abstract

There are a wide range of magmatism and mineralization in the Yunkai area of South China during the Late Yanshanian Period, including the newly discovered Michang, Youmapo, Sanchachong and Songwang porphyry-skarn W-Mo deposits. In this study, we obtained zircon U-Pb ages of the ore-bearing biotite granites and their mafic enclaves from 88±1 to 110±1 Ma. Zircons from the granites show Hf isotopic compositions with negative ε_Hf(t) values of -5.9 to -0.6 and calculated Hf model ages (T_DM2) of 1.5-1.2 Ga; indicating that the Middle Proterozoic crustal materials may have provided an important source for the magmatic rocks in this district during the Late Yanshanian Period, whereas zircons from the mafic enclaves show positive ε_Hf(t) values of 1.3 to 10.1 with younger Hf model ages (T_DM2) of 0.5-1.1 Ga, suggesting a mantle component may have involved in the granitic magma generation. Sulfur isotope study of the sulfide minerals from the W-Mo deposits show a narrow δ³⁴S distribution with most data ranging from -4.2‰ to 5.2‰. In addition, this study reports the first Fe isotopic compositions of pyrite in the W-Mo deposits, which show a uniform distribution range with the values near zero (δ⁵⁶Fe=0.16‰-0.58‰, average 0.35‰; δ⁵⁷Fe=0.02‰-0.54‰, average 0.48‰). These data indicate that the ore-forming materials may come from the deep-sourced granitic magma, and the mineralizations show a close relationship with the granitic magmatism during the Late Yanshanian Pe-riod. Combining with previous results, we suggest that there is a widespread porphyry-skarn W-Mo mineralization in the Yunkai area during the Late Cretaceous (80-110 Ma), which has a close relation-ship with the Late Yanshanian magmatism that may have formed during the rollback of the subducted Pacific Plate.
- zircon U-Pb age,
- Hf isotopes,
- S-Fe isotopes,
- granitic magmatism,
- Late Yanshanian,
- Yunkai area

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