扬子西缘新元古代盐边群火山岩年代学及大地构造背景

刘佩雯; 张继彪; 丁孝忠; 刘燕学

doi:10.3799/dqkx.2022.077

Volume 48 Issue 12

Dec. 2023

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Article Navigation > Earth Science > 2023 > 48(12): 4508-4526

Liu Peiwen, Zhang Jibiao, Ding Xiaozhong, Liu Yanxue, 2023. Geochronology and Tectonic Significance of Neoproterozoic Volcanic Rocks from Yanbian Group in Western Yangtze Block. Earth Science, 48(12): 4508-4526. doi: 10.3799/dqkx.2022.077

Citation:

Liu Peiwen, Zhang Jibiao, Ding Xiaozhong, Liu Yanxue, 2023. Geochronology and Tectonic Significance of Neoproterozoic Volcanic Rocks from Yanbian Group in Western Yangtze Block. Earth Science, 48(12): 4508-4526. doi: 10.3799/dqkx.2022.077

Citation:

Liu Peiwen, Zhang Jibiao, Ding Xiaozhong, Liu Yanxue, 2023. Geochronology and Tectonic Significance of Neoproterozoic Volcanic Rocks from Yanbian Group in Western Yangtze Block. Earth Science, 48(12): 4508-4526. doi: 10.3799/dqkx.2022.077

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Geochronology and Tectonic Significance of Neoproterozoic Volcanic Rocks from Yanbian Group in Western Yangtze Block

doi: 10.3799/dqkx.2022.077

Liu Peiwen^{1, 2
,
,},
Zhang Jibiao²,
Ding Xiaozhong^{1
,
,},
Liu Yanxue¹

1.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
School of Civil and Hydraulic Engineering, Xichang University, Xichang 615000, China

Received Date: 2021-12-21
Available Online: 2024-01-03
Publish Date: 2023-12-25

Abstract

Abstract

The Neoproterozoic Yanbian volcanic rocks are extensively exposed in the western Yangtze block, providing an ideal opportunity to study the Precambrian tectonic evolution of the Yangtze block. LA-ICP-MS zircon U-Pb dating of Zhagu Formation, Xiaoping Formation, Yumen Formation and Huangtian Formation yielded zircon U-Pb ages of 934±5 Ma, 863±4 Ma, 843±7 Ma and 797±9 Ma, respectively. The N-MORB (normal mid-ocean ridge basalts) type basalts from the Huangtian Formation belong to calc-alkaline series, and display light rare earth element depleted patterns, with moderate negative Nb, Ta anomaly and minor negative Ti anomalies. In addition, these rocks have positive ε_Nd(t) values (+3.8 to +4.9). They are suggested to be derived from 10%-20% partial melting of the MORB-like source in a fore-arc basin setting in the garnet+spinel stability field. Combined with previous studies, the data confirm the existence of an arc-trench system in the western Yangtze block in the Neoproterozoic. It proposes that the western Yangtze block was located in a convergent setting during the Neoproterozoic. The subduction of oceanic lithosphere beneath the western margin of the Yangtze block initiated no later than 934 Ma.
- western Yangtze block,
- Yanbian Group,
- zircon U-Pb dating,
- geochemistry,
- tectonic setting

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Geochronology and Tectonic Significance of Neoproterozoic Volcanic Rocks from Yanbian Group in Western Yangtze Block

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