肥东杂岩锆石U-Pb年龄和Lu-Hf同位素：对扬子克拉通统一结晶基底的限制

涂城; 张少兵; 苏克; 梁婷

doi:10.3799/dqkx.2020.169

Volume 46 Issue 5

May 2021

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Article Navigation > Earth Science > 2021 > 46(5): 1630-1643

Tu Cheng, Zhang Shaobing, Su Ke, Liang Ting, 2021. Zircon U-Pb Dating and Lu-Hf Isotope Results for Feidong Complex: Implications for Coherent Basement of the Yangtze Craton. Earth Science, 46(5): 1630-1643. doi: 10.3799/dqkx.2020.169

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Tu Cheng, Zhang Shaobing, Su Ke, Liang Ting, 2021. Zircon U-Pb Dating and Lu-Hf Isotope Results for Feidong Complex: Implications for Coherent Basement of the Yangtze Craton. Earth Science, 46(5): 1630-1643. doi: 10.3799/dqkx.2020.169

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Zircon U-Pb Dating and Lu-Hf Isotope Results for Feidong Complex: Implications for Coherent Basement of the Yangtze Craton

doi: 10.3799/dqkx.2020.169

Key Laboratory of Crust-Mantle Materials and Environments, Chinese Academy of Sciences, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China

Received Date: 2020-08-02
Publish Date: 2021-05-15

Abstract

Abstract

Archean-Paleoproterozoic basement is widespread in the Yangtze craton. However, many essential problems about the formation and evolution of the Precambrian basement of the Yangtze craton are still open, especially whether the basement of the Yangtze craton is coherent or composed of multiple blocks. A geochronological and geochemical study was carried out for the felsic gneiss, amphibolite and intrusive granite from the Feidong complex in the Zhangbaling uplift at the northern margin of the Yangtze craton. Zircon U-Pb dating gives similar protolith ages of 2 449±17 Ma, 2 444±15 Ma, 2 495±23 Ma and 2 478±24 Ma for the felsic gneisses. The ages of the amphibolite and A-type granite are 2 032±35 Ma and 747±4 Ma, respectively. This indicates that the Late Archean-Paleoproterozoic crystalline basement of the Yangtze craton cropped out in this area. The zircon ε_Hf(t) values of the ca. 2.45-2.50 Ga gneisses are negative with an average value of -3.6±0.5 and the corresponding two-stage Hf model ages (T_DM2) range from 3.3 to 3.0 Ga with an average of 3 185±31 Ma, which shows that the 2.45-2.50 Ga magmatic event is mainly the reworking of Paleo-Mesoarchean crust. The occurrence of similar magmatic rocks in other terranes, including the Yudongzi Group and Douling complex in the northern Yangtze craton, as well as detrital zircons and volcanic xenocrystals with similar ages widespread in the Yangtze craton, suggests that the basement is coherent throughout the whole Yangtze craton.
- Archean-Paleoproterozoic,
- Feidong complex,
- Yangtze craton,
- crystalline basement,
- geochemistry

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Zircon U-Pb Dating and Lu-Hf Isotope Results for Feidong Complex: Implications for Coherent Basement of the Yangtze Craton

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