Discovery of volcanic matter in the Upper Maokou Formation of the Wumengshan area : Evidence of early activity of the Emeishan mantle plume

ZHANG Honghui; YANG Zhao; LI Zhiwei; CHEN Guiren; YU Yangzhong; YUAN Yongsheng; LI Suoming; ZHANG Yaotang; ZHANG Liyuan; ZHAO Jianbo; WU Liang; PAN Jiangtao

doi:10.12097/gbc.2023.07.002

2024 Vol. 43, No. 7

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Article navigation > Geological Bulletin of China > 2024 > 43(7): 1207-1220

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ZHANG Honghui, YANG Zhao, LI Zhiwei, CHEN Guiren, YU Yangzhong, YUAN Yongsheng, LI Suoming, ZHANG Yaotang, ZHANG Liyuan, ZHAO Jianbo, WU Liang, PAN Jiangtao. 2024. Discovery of volcanic matter in the Upper Maokou Formation of the Wumengshan area : Evidence of early activity of the Emeishan mantle plume. Geological Bulletin of China, 43(7): 1207-1220. doi: 10.12097/gbc.2023.07.002

Citation:

ZHANG Honghui, YANG Zhao, LI Zhiwei, CHEN Guiren, YU Yangzhong, YUAN Yongsheng, LI Suoming, ZHANG Yaotang, ZHANG Liyuan, ZHAO Jianbo, WU Liang, PAN Jiangtao. 2024. Discovery of volcanic matter in the Upper Maokou Formation of the Wumengshan area : Evidence of early activity of the Emeishan mantle plume. Geological Bulletin of China, 43(7): 1207-1220. doi: 10.12097/gbc.2023.07.002

Discovery of volcanic matter in the Upper Maokou Formation of the Wumengshan area : Evidence of early activity of the Emeishan mantle plume

1.
Kunming General Survey of Natural Resources Center, China Geological Survey, Kunming 650111, Yunnan, China
2.
Technology Innovation Center for Natural Ecosystem Carbon Sink, Ministry of Natural Resources, Kunming 650111, Yunnan, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, Hubei, China
4.
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
5.
Geophysical Investigation Center, China Geological Survey, Langfang 065000, Hebei, China

More Information

Corresponding authors: LI Zhiwei, 515108084@qq.com ; CHEN Guiren, 903207023@qq.com

Received Date: 02 July 2023

Revised Date: 09 January 2024

Publish Date: 15 July 2024

Abstract

Abstract

The Emeishan mantle plume activity is an important geological event in Phanerozoic. To deepen our understanding on the evolution of the Emeishan mantle plume activity in the Wumengshan area of northeastern Yunnan, the isotopic chronology, zircon trace element, zircon Lu−Hf isotopes and dental spines of the middle and upper tuffs of the Maokou Formation in this area were investigated, which is a new direct petrology evidence for the evolution of Emeishan mantle plume activity in the Wumengshan area of northeast Yunnan Province, and the result shows that the zircon U−Pb age of the uppermost tuffs of the Maokou Formation is 268.7 ±1.7 Ma(MSWD=0.89, n=8), consisting with the Jinogondolella aserrata, which is a typical molecule of the Permian Guadalupian Wordian. The zircon trace element characteristics of the uppermost tuffs of the Maokou Formation show affinities of basalt magma origin and continental arc−type tectonic setting, together with a high Th/Nb value, indicating a volcanic activity pre the large−scale eruption of the Emeishan Large Igneous Province. The ε_Hf(t) value of the zircons of the Maokou Formation is −6.7~11.6, indicating that the volcanic activity pre the Emeishan mantle plume was strongly influenced by the mantle plume materials and more crustal materials. The discovery of tuff in Maokou Formation shows that the Emeishan mantle plume has undergone a small−scale magmatic eruption in the Wumengshan area during the in the Permian Guadalupian Wordian. During this period, the mantle plume mainly played the role of conducting heat to the lithosphere and melting some mantle materials, which added new evidence for the establishment of Emeishan mantle plume model.
- mantle plume /
- Emeishan flood basalt /
- volcanicity /
- Maokou Formation /
- conodont /
- zircon U−Pb ages /
- Lu−Hf /
- geological survey engineering

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References

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