Geochemical Characteristics and Its Geological Significance of the Lower Cretaceous Zenong Group Volcanic Rocks of Geji Country, Tibet

YANG Yongfeng; JIANG Yaguo; TANG Jing; CHENG Quan

doi:10.12401/j.nwg.2024072

Northwestern Geology > 2024 > 57(6): 300-317. > DOI: 10.12401/j.nwg.2024072

YANG Yongfeng，JIANG Yaguo，TANG Jing，et al. Geochemical Characteristics and Its Geological Significance of the Lower Cretaceous Zenong Group Volcanic Rocks of Geji Country, Tibet[J]. Northwestern Geology，2024，57（6）：300−317. doi: 10.12401/j.nwg.2024072

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Geochemical Characteristics and Its Geological Significance of the Lower Cretaceous Zenong Group Volcanic Rocks of Geji Country, Tibet

1.
Shaanxi Mining Technology Industry Co., Ltd., Xi’an 710000, Shaanxi, China
2.
Regional Geological Survey Academe of Shaanxi Geology and Mining Group Co., Ltd., Xianyang 712000, Shaanxi, China

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Received Date: September 04, 2022
Revised Date: March 07, 2024
Accepted Date: March 19, 2024
Available Online: October 08, 2024

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Abstract

Abstract

The Zenong Group is exposed widely in the Geji area of Tibet and is composed of Duo'ai Formation, Tuo 'cheng Formation, and Langjiu Formation from bottom to top. This study carried petrography, geochemistry, and chronology on the Zenong Group volcanic rocks. It was found that these volcanic rocks show obvious eruption unconformity and pulsed magmatism. According to the major element composition, the igneous rocks of the Duo'ai, and Tuo 'cheng Formations belong to the alkaline-calc-alkaline series, while the rocks of the Langjiu Formation belong to the alkaline series. The trace elements, REE distribution, and tectonic discrimination diagram show that the Duo'ai, and Tuocheng Formation formed in the island arc environment, while the Langjiu formed in the island arc environment near the active continental margin. The average weighted zircon U-Pb age of the hornblende andesite from the Duo'ai Formation is （111.2±2.1）Ma. Combination with previous work and this study, we suggest the Zenong Group volcanic rocks are the marginal continental arc of the southward subduction of the Slainajap ocean basin represented by the Shiquanhe-Yongzhu-Namco-Jiali ophiolitic melange belt.
- early Cretaceous,
- Zenong Group,
- Gangdese belt,
- geochemistry,
- volcanic rocks

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Geochemical Characteristics and Its Geological Significance of the Lower Cretaceous Zenong Group Volcanic Rocks of Geji Country, Tibet

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