泰国北部晚泥盆世后碰撞岩浆岩：对特提斯演化的启示

刘方凯; 冯庆来; 赵天宇; PunyawaiWunnaporn; KhanmaneeJongkonnee

doi:10.3799/dqkx.2023.033

Volume 49 Issue 8

Aug. 2024

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Article Navigation > Earth Science > 2024 > 49(8): 2736-2750

Liu Fangkai, Feng Qinglai, Zhao Tianyu, Wunnaporn Punyawai, Jongkonnee Khanmanee, 2024. Late Devonian Post-Collisional Magmatic Rocks in Northern Thailand: Implication for the Tethyan Evolution. Earth Science, 49(8): 2736-2750. doi: 10.3799/dqkx.2023.033

Citation:

Liu Fangkai, Feng Qinglai, Zhao Tianyu, Wunnaporn Punyawai, Jongkonnee Khanmanee, 2024. Late Devonian Post-Collisional Magmatic Rocks in Northern Thailand: Implication for the Tethyan Evolution. Earth Science, 49(8): 2736-2750. doi: 10.3799/dqkx.2023.033

Citation:

Liu Fangkai, Feng Qinglai, Zhao Tianyu, Wunnaporn Punyawai, Jongkonnee Khanmanee, 2024. Late Devonian Post-Collisional Magmatic Rocks in Northern Thailand: Implication for the Tethyan Evolution. Earth Science, 49(8): 2736-2750. doi: 10.3799/dqkx.2023.033

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Late Devonian Post-Collisional Magmatic Rocks in Northern Thailand: Implication for the Tethyan Evolution

doi: 10.3799/dqkx.2023.033

1.
State Key Laboratory of Geological Processes and Mineral Resources, Wuhan 430074, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
Faculty of International Education, China University of Geosciences, Wuhan 430074, China

Received Date: 2023-03-01
Available Online: 2024-08-27
Publish Date: 2024-08-25

Abstract

Abstract

The studies of the Tethys tectonic belt in Southeast Asia mainly focus on the evolution of the Paleo-Tethys in the Late Paleozoic, while the studies of the Proto-Tethys evolution immediately are pretty weakThe present study focuses on zircon U-Pb geochronology, geochemistry and zircon Lu-Hf isotopes of granites and hornblende gabbros from northern Thailand. These magmatic rocks yielded zircon U-Pb weighted mean age of 367-361 Ma.The geologic age is the Late Devonian. The northern Thailand granites are the high-K calc-alkaline A₂ type granites, with the geochemical characteristics of relatively enriched LILE and relatively depleted HFSE, with obvious negative anomalies of Nb, Ta, Sr and Ti. The Hf isotopes have positive ε_Hf(t) values (+5.43-+10.91) with T_DM2 ages of 1 015.0-668.9 Ma, indicating a juvenile mafic lower crust source.The hornblende gabbros showhigh Al₂O₃、Zr and Nbcontents, but low contents of TiO₂ and Ni, with the geochemical characteristics ofrelatively enriched LILE and relatively depleted HFSE, with the distinctly negative Nb and Ta anomalies, similar to the characteristics of island arc calc-alkaline basalts. Positive ε_Hf(t) values (+1.24-+9.11) and high Mg^# (50.0-64.8) indicate that it originates from the depleted mantle wedge. Based on the U-Pb age, Hf isotope and geochemical characteristics of the magmatic rocks in northern Thailand, it is believed that they were formed in the Late Devonian post-collisional extension-related tectonic setting, which can be compared with the corresponding the Proto-Tethys geological records in eastern Myanmar and southwestern Yunnan. The results provide evidence for the evolution of the Proto-Tethys in southwest Yunnan and Southeast Asia.
- Late Devonian,
- Tethys,
- magmatic rock,
- post-collision,
- northern Thailand,
- geochemistry

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References(51)

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Late Devonian Post-Collisional Magmatic Rocks in Northern Thailand: Implication for the Tethyan Evolution

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