扬子西缘新元古代中期裂谷作用：来自年代学与沉积学的新证据

刘石磊; 崔晓庄; 汪长林; 任光明; 王鹏; 庞维华; 任飞

doi:10.3799/dqkx.2020.145

Volume 45 Issue 8

Aug. 2020

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Article Navigation > Earth Science > 2020 > 45(8): 3082-3093

Liu Shilei, Cui Xiaozhuang, Wang Changlin, Ren Guangming, Wang Peng, Pang Weihua, Ren Fei, 2020. New Sedimentological and Geochronological Evidence for Mid-Neoproterozoic Rifting in Western Yangtze Block, South China. Earth Science, 45(8): 3082-3093. doi: 10.3799/dqkx.2020.145

Citation:

Liu Shilei, Cui Xiaozhuang, Wang Changlin, Ren Guangming, Wang Peng, Pang Weihua, Ren Fei, 2020. New Sedimentological and Geochronological Evidence for Mid-Neoproterozoic Rifting in Western Yangtze Block, South China. Earth Science, 45(8): 3082-3093. doi: 10.3799/dqkx.2020.145

Citation:

Liu Shilei, Cui Xiaozhuang, Wang Changlin, Ren Guangming, Wang Peng, Pang Weihua, Ren Fei, 2020. New Sedimentological and Geochronological Evidence for Mid-Neoproterozoic Rifting in Western Yangtze Block, South China. Earth Science, 45(8): 3082-3093. doi: 10.3799/dqkx.2020.145

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New Sedimentological and Geochronological Evidence for Mid-Neoproterozoic Rifting in Western Yangtze Block, South China

doi: 10.3799/dqkx.2020.145

1.
Chengdu Center of China Geological Survey, Chengdu 610081, China
2.
Geophysical Prospecting Team, Sichuan Provincial Bureau of Geology and Mineral Resources Exploration, Chengdu 610072, China

Received Date: 2020-04-01
Publish Date: 2020-08-15

Abstract

Abstract

Although the evolution of the mid-Neoproterozoic basins in South China is closely related to the Rodinia supercontinent breakup, it still lacks fine characterization. In this study, detrital zircon LAICP-MS U-Pb dating and systematic sedimentary analyses were performed on the Chengjiang Formation in the western Yangtze Block. Most of the clastic zircon U-Pb ages in Chengjiang Formation are Neoproterozoic (870-780 Ma), and a few are pre-Neoproterozoic (2 850-1 010 Ma).The most significant peak of U-Pb ages in Chengjiang Formation is 820 Ma, and the youngest age population yields a weighted mean of 804.5±5.4 Ma. Taking into account the available age data, it is suggested that the deposition time of Chengjiang Formation is further limited to 800-720 Ma. The Neoproterozoic detrital zircons of Chengjiang Formation were mainly denuded from neighboring Neoproterozoic magmatic rocks. The pre-Neoproterozoic zircons may come from the denudation of pre-Neoproterozoic pluton or the sedimentary recycling of strata. Mid-Neoproterozoic sedimentary rocks on the western margin of the Yangtze have a sedimentary evolution sequence that is characterized by gradual transitions from alluvial fan facies to anterior fan delta facies, and finally forms a "wedge formation" with rift filling characteristics. The sedimentary overlap process is common throughout the South China rift system, indicating that South China entered the maturity stage of the rift basin at 800 Ma.
- western Yangtze Block,
- zircon age,
- provenance analysis,
- rift basin,
- geochronology,
- sedimentology

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