Geochemistry and geochronology of intermediate–basic rocks in the Galwan Valley area of the North Qiangtang terrane, Karakoram

HE Guojian; HU Xiumian; LOU Fasheng; CHEN Haopeng; YANG Xiaofei; CHEN Jianzhong; WU Chunwei; ZHANG Miliang

doi:10.12029/gc20201116001

GEOLOGY IN CHINA > 2024 > 51(4): 1422-1440. > DOI: 10.12029/gc20201116001

He Guojian, Hu Xiumian, Lou Fasheng, Chen Haopeng, Yang Xiaofei, Chen Jianzhong, Wu Chunwei, Zhang Miliang. 2024. Geochemistry and geochronology of intermediate–basic rocks in the Galwan Valley area of the North Qiangtang terrane, Karakoram[J]. Geology in China, 51(4): 1422−1440. DOI: 10.12029/gc20201116001

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Geochemistry and geochronology of intermediate–basic rocks in the Galwan Valley area of the North Qiangtang terrane, Karakoram

1.
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu, China
2.
Basic Geological Survey Institute of Jiangxi Geological Survey and Exploration Institute, Nanchang 330030, Jiangxi, China
3.
Jiangxi Institute of Geological Prospecting and Mineral Resource for Nonferrous Metal, Nanchang 330030, Jiangxi, China
4.
Jiangxi Geological Survey and Exploration Institute, Nanchang 330009, Jiangxi, China
5.
No.3 Geological Team, Xinjiang Bureau of Geology and Mineral Exploration and Development, Korla 841000, Xinjiang, China

Funds: Supported by the projeet of Xinjiang Geological Exploration Fund (No.K15–1–LQ22).

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Author Bio:
HE Guojian, male, born in 1987, master candidate, senior engineer, mainly engaged in the Qinghai Tibet Plateau regional geological and mineral researches; E-mail: 541373659@qq.com
Received Date: November 15, 2020
Revised Date: January 21, 2021

Graphical Abstract

Abstract

Abstract

This paper is the result of geological survey engineering.
Objective
The Galwan Valley, which adjacent to the Huoshaoyun super large lead−zinc deposit, located in the Karakoram Mountains of the Northern Qiangtang terrane. A systematically lithogeochemistry and chronological studies was conducted on the newly discovered magmatic rocks in the Galwan Valley area to helps us deeply understanding the regional metallogenic dynamics and magmatic evolution history, providing a theoretical foundation for the study of regional magmatic−tectonic−mineralization processes.
Methods
This study reports seven samples of intermediate−basic magmatic rocks in the Galwan Valley area, including basalt, diabase, and diorite. A systematic mineralogical, major and trace element, zircon U–Pb age, and trace element analyses were conducted on these samples.
Results
The zircon U–Pb dating results indicate that the Bingdong diorite is emplaced at (98.9±1.2) Ma, and its whole−rock composition is characterized by low−potassium calc−alkaline features. In contrast, the zircon U–Pb dating results for the basalt show an eruption age of (232±9) Ma, with its whole−rock geochemical composition displaying calcium alkali or peralkaline characteristics. The zircon dating results show that both the diorite and basalt samples contain a large number of ~800 Ma inherited zircons, and both have age spectra featuring six distinct age peaks.
Conclusions
The Bingdong diorite is a product of crust−mantle mixing under a crustal thickening background, related to the remote effect of the India–Asia collision orogeny following the closure of the Neo–Tethys Ocean. The existence of numerous ~800 Ma inherited zircons in the diorite and basalt indicates that they originated from the melting of Neoproterozoic basement material. The six distinct zircon age peaks in both the diorite and basalt reflect six periods of tectono–magmatic activity, ranging from the Mesoproterozoic crystalline basement and the breakup of the Rodinia supercontinent to the closure of the Neo–Tethys Ocean and subsequent collisional orogeny.
- inherited zircon,
- basement,
- geological survey engineering,
- Gallevan Valley,
- the North Qiangtang terrane,
- Karakoram
Highlights
We have obtained new ages of intermediate−basic magmatic rocks in the Galwan Valley area, and inferred the material source of their Neoproterozoic basement melting through a large number of ~800 Ma inherited zircon ages. Diorites and basalts inherited zircon age spectra were used as evidence for geological records to sort out and explore regional tectonic magmatic geological evolution activities.

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References (55)

References

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Geochemistry and geochronology of intermediate–basic rocks in the Galwan Valley area of the North Qiangtang terrane, Karakoram

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