Neoproterozoic magmatic rocks associated with the opening of Paleo-Asian Ocean in Beishan area

WANG Erteng; ZHAI Xinwei; CHEN Wanfeng; WU Lei; SONG Gaorui; WANG Jinrong

doi:10.12097/gbc.2022.10.022

2025 Vol. 44, No. 1

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Article navigation > Geological Bulletin of China > 2025 > 44(1): 129-135

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WANG Erteng, ZHAI Xinwei, CHEN Wanfeng, WU Lei, SONG Gaorui, WANG Jinrong. 2025. Neoproterozoic magmatic rocks associated with the opening of Paleo-Asian Ocean in Beishan area. Geological Bulletin of China, 44(1): 129-135. doi: 10.12097/gbc.2022.10.022

Citation:

WANG Erteng, ZHAI Xinwei, CHEN Wanfeng, WU Lei, SONG Gaorui, WANG Jinrong. 2025. Neoproterozoic magmatic rocks associated with the opening of Paleo-Asian Ocean in Beishan area. Geological Bulletin of China, 44(1): 129-135. doi: 10.12097/gbc.2022.10.022

Neoproterozoic magmatic rocks associated with the opening of Paleo-Asian Ocean in Beishan area

School of Earth Science, Lanzhou University/Key Laboratory of Mineral Resources in Western China (Gansu Province), Lanzhou 730000, Gansu, China

More Information

Corresponding authors: ZHAI Xinwei, zhaixw926@lzu.edu.cn ; WANG Jinrong, jrwang@lzu.edu.cn

Received Date: 18 October 2022

Revised Date: 08 February 2023

Publish Date: 15 January 2025

Abstract

Abstract

Objective
Precambrian rocks distributed in the Beishan area, located in the southern Central Asian Orogenic Belt, is significant for the study of the formation of the Paleo−Asian Ocean (PAO) and its associated mineralization. However, there are no constraints on the magmatism related to opening of PAO, and there is a lack of accurate chronological data regarding the formation of the Hongshan Iron Ore (HIO) deposits in the Beishan area.
Methods
We present the results of field investigations, zircon U−Pb dating, and geochemical analyses of the gabbro and andesitic tuff found in the central Beishan area.
Results
The new U−Pb dating results reveal the crystallization ages of the gabbro and andesitic tuff crystallized at 765 Ma, 756 Ma, respectively. The geochemical composition of the gabbro is indicative of an intraplate rift setting, suggesting a continental tectonic environment during its formation.
Conclusions
Integrating our findings with previous studies, we infer that the southern PAO had opened before 765 Ma in the Beishan area. Additionally, we conclude that the HIO formation occurred during the Nanhuanian Period (756 Ma).
- Beishan area /
- opening time of Paleo-Asian Ocean /
- Neoproterozoic /
- magmatic rocks

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References

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