Discovery and determination of high-pressure garnet-amphibolite in Dahongshan Group in Gasa area, southwest margin of central Yangtze, Yunnan Province

HUANG Liang; HUANG Zhao; SUN Zaibo; ZENG Wentao; HE Yunlong; LYU Wei; YANG Xushan; LIU Fulai; HE Zhaorong

doi:10.12097/gbc.2022.08.003

2024 Vol. 43, No. 10

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HUANG Liang, HUANG Zhao, SUN Zaibo, ZENG Wentao, HE Yunlong, LYU Wei, YANG Xushan, LIU Fulai, HE Zhaorong. 2024. Discovery and determination of high-pressure garnet-amphibolite in Dahongshan Group in Gasa area, southwest margin of central Yangtze, Yunnan Province. Geological Bulletin of China, 43(10): 1818-1829. doi: 10.12097/gbc.2022.08.003

Citation:

HUANG Liang, HUANG Zhao, SUN Zaibo, ZENG Wentao, HE Yunlong, LYU Wei, YANG Xushan, LIU Fulai, HE Zhaorong. 2024. Discovery and determination of high-pressure garnet-amphibolite in Dahongshan Group in Gasa area, southwest margin of central Yangtze, Yunnan Province. Geological Bulletin of China, 43(10): 1818-1829. doi: 10.12097/gbc.2022.08.003

Discovery and determination of high-pressure garnet-amphibolite in Dahongshan Group in Gasa area, southwest margin of central Yangtze, Yunnan Province

1.
Yunnan Institute of Geological Survey (Yunnan Academy of Geological Sciences), Kunming 650216, Yunnan, China
2.
Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, MNR, Kunming 650051, Yunnan, China
3.
Yunnan Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization, Kunming 65005l, Yunnan, China
4.
Kungang Group Yuxi Dahongshan Mining Co., Ltd., Yuxi 653400, Yunnan, China
5.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

More Information

Corresponding author: SUN Zaibo, 1553974947@qq.com

Received Date: 04 August 2022

Revised Date: 12 November 2022

Publish Date: 15 October 2024

Abstract

Abstract

In the course of field geological investigation, a new set of metamorphic rocks with strong metamorphism was discovered in the Hongshan Formation of Dahongshan Group in the shallow lava iron ore area of Jiesa, Xinping County, central Yunnan Province. Petrographic studies show that the metamorphic rocks are eclogite amphibolites with strong retrometamorphism and only partial subduction−reentrant mineralogical records. There is no mineral association in the early metamorphic and peak metamorphic stages of the rocks, and the mineral generations have the characteristics of clockwise metamorphic tracks. According to the results of electron probe test, the maximum metamorphic pressure recorded by GBP (Garnet−Biotite−Plagioclase) average temperature manometer is 1.52 GPa. The maximum metamorphic pressure of hornblende recorded by temperature manometer method is 0.66 GPa, which indicates that the eclogite in this study is of high pressure metamorphic grade. According to the diagenetic age, metamorphic age and geochemical characteristics of Dahongshan Group, it is believed that Dahongshan Group was formed in the cracking period of the Columbia supercontinent and is a rock component of the Late Paleoproterozoic ocean basin. The main−stage metamorphism was formed by the subduction−reentrant process of the Rodinia supercontinent, and the Dahongshan Group may be an incomplete set of ophiolitic melanomics, representing the remnants of the Late Paleoproterozoic ocean basin.
- Dahongshan Group /
- garnet-amphibolite /
- high pressure /
- clockwise deterioration /
- Gasa area /
- central Yunnan

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References

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