Zircon U–Pb age, Hf isotopic characteristics and crustal extension of the gabbro in the Yagan Cu–Ni–Co deposit, Alxa Left Banner, Inner Mongolia

ZHANG Chao; LI Zhidan; ZHANG Feng; DUAN Ming; YU Reng'an; CHEN Junqiang; XIE Yu

doi:10.12029/gc20210401001

2024 Vol. 51, No. 4

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ZHANG Chao, LI Zhidan, ZHANG Feng, DUAN Ming, YU Reng'an, CHEN Junqiang, XIE Yu. 2024. Zircon U–Pb age, Hf isotopic characteristics and crustal extension of the gabbro in the Yagan Cu–Ni–Co deposit, Alxa Left Banner, Inner Mongolia[J]. Geology in China, 51(4): 1368-1386. doi: 10.12029/gc20210401001

Citation:

ZHANG Chao, LI Zhidan, ZHANG Feng, DUAN Ming, YU Reng'an, CHEN Junqiang, XIE Yu. 2024. Zircon U–Pb age, Hf isotopic characteristics and crustal extension of the gabbro in the Yagan Cu–Ni–Co deposit, Alxa Left Banner, Inner Mongolia[J]. Geology in China, 51(4): 1368-1386. doi: 10.12029/gc20210401001

Zircon U–Pb age, Hf isotopic characteristics and crustal extension of the gabbro in the Yagan Cu–Ni–Co deposit, Alxa Left Banner, Inner Mongolia

1.
Tianjin Center, China Geological Survey, Tianjin 300170, China
2.
North China Geological Science and Technology Innovation Center, Tianjin 300170, China
3.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

Fund Project: Supported by National Key Research and Development Program (No.2018YFC0604200) and the projects of China Geological Survey (No.DD20190119, No.DD20211191, No.DD20221871, No.DD20221686).

More Information

Author Bio: ZHANG Chao, male, born in 1987, master, senior engineer, engaged in mineralogical research and mineral geological survey; E–mail: 402709002@qq.com
Corresponding author: LI Zhidan, male, born in 1986, doctoral candidate, senior engineer, engaged in mineralogical research and mineral geological survey; E–mail: cugcug@qq.com.

Received Date: 01 April 2021

Revised Date: 23 October 2023

Publish Date: 25 July 2024

Abstract

Abstract

This paper is the result of mineral exploration engineering.
Objective
The copper–nickel–cobalt deposit in the Alxa Left Banner is a typical sulfide deposit in western Inner Mongolia, developed in the ultrabasic−medium basic magmatic rock zone. The gabbro is an ore–forming rock, and recognizing the magmatic activity, metallogenic regularity and tectonic background have become an urgent geological problem.
Methods
Related samples were collected to study petrography, petrogeochemistry, zircon U–Pb chronology and Hf isotope.
Results
Geochemical characteristics shows that the Yagan gabbro has the characteristics of high Al₂O₃ (15.99%–17.47%), sub−alkaline (K₂O+Na₂O=4.94%–5.86%), low TiO₂ (0.81%–1.12%), low P₂O₅ (0.14%–0.21%), high MgO (3.18%–5.64%), low K₂O (1.14%–2.05%), indicating of the calcium alkaline series. The total amount of rare earth (ΣREE) is 71.43×10⁻⁶–94.22×10⁻⁶, presents right–inclined distribution model, the light rare earth is relatively enriched and the heavy rare earth is depleted. The high field strength elements (Nb, P, Ta) are obviously depleted, incompatible elements (U, Sr) are enriched, suggested that the Yagan gabbro originated from the lithospheric mantle and experienced crystallization differentiation in the late magmatic stage. The zircon U–Pb weighted average age of the Yagan gabbro is (268.8±3.1) Ma, indicating the age of diagenesis belongs to Middle Permian. The ε_Hf(t) values is −7.1–2.9 and two staged Hf model age is 1272–2177 Ma.
Conclusions
Regional geological data and geochemical characteristics indicate that the Yagan gabbro original magma may be confused by some crustal materials during the migration process. The formation tectonic background may be the post–collision and extension environment in the Late Paleozoic. In addition, the emplacement age of Yagan gabbro limited the collision closing time, which provides new constraints for the study of Cu–Ni–Co deposits in this region.
- Cu–Ni–Co deposit /
- zircon U–Pb age /
- petrogeochemistry /
- mineral exploration engineering /
- Yagan /
- Alxa Left Banner /
- Inner Mongolia

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