扬子陆块西南缘3.8 Ga碎屑锆石及其地质意义

任光明; 庞维华; 王立全; 孙志明; 王保弟; 崔晓庄; 尹福光; 宁括步

doi:10.3799/dqkx.2020.095

Volume 45 Issue 8

Aug. 2020

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Article Navigation > Earth Science > 2020 > 45(8): 3040-3053

Ren Guangming, Pang Weihua, Wang Liquan, Sun Zhiming, Wang Baodi, Cui Xiaozhuang, Yin Fuguang, Ning Kuobu, 2020. Detrital Zircons of 3.8 Ga in Southwestern Yangtze Block and Its Geological Implications. Earth Science, 45(8): 3040-3053. doi: 10.3799/dqkx.2020.095

Citation:

Ren Guangming, Pang Weihua, Wang Liquan, Sun Zhiming, Wang Baodi, Cui Xiaozhuang, Yin Fuguang, Ning Kuobu, 2020. Detrital Zircons of 3.8 Ga in Southwestern Yangtze Block and Its Geological Implications. Earth Science, 45(8): 3040-3053. doi: 10.3799/dqkx.2020.095

Citation:

Ren Guangming, Pang Weihua, Wang Liquan, Sun Zhiming, Wang Baodi, Cui Xiaozhuang, Yin Fuguang, Ning Kuobu, 2020. Detrital Zircons of 3.8 Ga in Southwestern Yangtze Block and Its Geological Implications. Earth Science, 45(8): 3040-3053. doi: 10.3799/dqkx.2020.095

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Detrital Zircons of 3.8 Ga in Southwestern Yangtze Block and Its Geological Implications

doi: 10.3799/dqkx.2020.095

Chengdu Center of China Geological Survey, Chengdu 610081, China

Received Date: 2020-03-09
Publish Date: 2020-08-15

Abstract

Abstract

Discovery of ancient zircons and rocks is the key to exploring the early geological evolution of the earth. In order to further decipher the basement material composition and early crustal formation and evolution of the Yangtze Block, it conducted the chronological study on the metamorphic sandstone of the Dongchuan Group in the Lufeng area of southwestern Yangtze Block with LA-ICP-MS zircon U-Pb dating, and the detrital zircon of 3 822±21 Ma was found. This is the second zircon with the age older than 3.8 Ga in the Yangtze Block, and it's also the oldest age record that has been found in the southwestern Yangtze Block. The clastic material of the metasandstone mainly includes four age peaks (~2 320 Ma, ~2 162 Ma, ~2 036 Ma and~1 915 Ma). Two youngest zircons basically limit the maximum deposition age of the Dongchuan Group, which coincides with the volcanic rock age of Yinmin Formation in the region. In addition, it also contains a small amount of clastic materials with the ages of 2.6-2.9 Ga and 3.7-3.8 Ga. The Hf isotopic composition shows that these detrital zircons have different origins. The clastic zircons with the age of 2 674-3 822 Ma have positive ε_Hf (t) values and two-stage Hf model age of 2.9-3.9 Ga, suggesting a certain scale of juvenile crust distribution within the Yangtze Block during the Hadean-Archean period. The Paleoproterozoic (1.9-2.4 Ga) magmatic activities were characterized by partial melting of the Archean (2.5-3.7 Ga) ancient crust, except for a small amount of melting of the Paleoproterozoic (2.3-2.4 Ga) juvenile crust. The Mesoproterozoic is more manifested in the melting and recycling of ancient crust. This study provides new information for deepening the understanding of the early geological evolution of the Yangtze Block.
- U-Pb dating,
- Hf isotope,
- Dongchuan Group,
- detrital zircon,
- Yangtze Block,
- geochronology

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