Zircon U-Pb and Lu-Hf Isotopic Dating of Magmatic Rocks in the Wunugetushan Porphyry Copper-Molybdenum Deposit, Inner Mongolia

ZHANG Xuejun; ZHANG Yaoyao; LIU Kai; HE Xiaolong; WANG Shuxun; JIA Wuhui; ZHAO Zenan

doi:10.15898/j.cnki.11-2131/td.202207180132

2022 Vol. 41, No. 5

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ZHANG Xuejun, ZHANG Yaoyao, LIU Kai, HE Xiaolong, WANG Shuxun, JIA Wuhui, ZHAO Zenan. Zircon U-Pb and Lu-Hf Isotopic Dating of Magmatic Rocks in the Wunugetushan Porphyry Copper-Molybdenum Deposit, Inner Mongolia[J]. Rock and Mineral Analysis, 2022, 41(5): 774-788. doi: 10.15898/j.cnki.11-2131/td.202207180132

Citation:

ZHANG Xuejun, ZHANG Yaoyao, LIU Kai, HE Xiaolong, WANG Shuxun, JIA Wuhui, ZHAO Zenan. Zircon U-Pb and Lu-Hf Isotopic Dating of Magmatic Rocks in the Wunugetushan Porphyry Copper-Molybdenum Deposit, Inner Mongolia[J]. Rock and Mineral Analysis, 2022, 41(5): 774-788. doi: 10.15898/j.cnki.11-2131/td.202207180132

Zircon U-Pb and Lu-Hf Isotopic Dating of Magmatic Rocks in the Wunugetushan Porphyry Copper-Molybdenum Deposit, Inner Mongolia

1.
Chinese Academy of Geological Sciences, Beijing 100037, China
2.
School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
3.
School of Environment and Resources, Xiangtan University, Xiangtan 411105, China
4.
Hebei Regional Geological Survey Institute, Langfang 065000, China

More Information

Corresponding author: ZHANG Yaoyao, zhangyy@cags.ac.cn

Received Date: 18 July 2022

Revised Date: 12 September 2022

Accepted Date: 20 September 2022

Publish Date: 28 September 2022

Abstract

Abstract

BACKGROUND
The Wunugetushan copper-molybdenum deposit located in the northwest of the Erguna—Hulun fault is a large porphyry copper-molybdenum deposit. Magmatic rocks are widespread in the mining area.
OBJECTIVES
In order to determine the emplacement age and tectonic setting of ore-hosting surrounding rock and ore-forming parent rock, and to discuss the petrogenesis and metallogenic dynamics.
METHODS
Zircon U-Pb isotopes and zircon Lu-Hf isotopes of rocks were studied by laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) and laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS).
RESULTS
(1) The zircons in the study area have a high content of REE with strong enrichment of HREE, δEu negative anomaly and δCe positive anomaly, and the REE distribution curves are left-inclined. (2) The anisomitic monzogranites are the ore-hosting rocks with a weighted average value of 200.96±0.88Ma, indicating that the rock mass was formed in early Jurassic. Zircon εHf(t) ranges from 0.1 to 5.8, single-stage Hf model ages (TDM) range from 643Ma to 882Ma, and two-stage Hf model ages (TDMC) range from 874Ma to 1235Ma. (3) The rhyolite porphyritic lavas are the ore-forming parent rocks with a weighted average value of 179.58±0.91Ma, indicating that the rocks formed in the Early Jurassic. Zircon εHf(t) ranges from 4.3 to 6.6, single-stage Hf model ages (TDM) range from 570Ma to 663Ma, and two-stage Hf model ages (TDMC) range from 802Ma to 952Ma.
CONCLUSIONS
The zircon Lu-Hf isotopic characteristics of the anisomitic monzogranites indicate that the magma source is a mixture of mantle and a small amount of ancient crust. The magma source area of the rhyolite porphyritic lavas is dominated by mantle-derived materials. The transition evolution process from crust source to mantle source from host rock to metallogenic parent rock is revealed.
- Wunugetushan copper-molybdenum deposit /
- LA-MC-ICP-MS /
- U-Pb isotope /
- Lu-Hf isotope /
- petrogenesis

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