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Year 2025
 
Vol 66, Issue 1, [02 - 2025]

U-Pb Zircon ages of Granodiorits of the Dien Binh complex in the Kon Tum massif and its tectonic significances

DOI:10.46326/JMES.2025.66(1).03

  • Affiliations:

    1 Hanoi University of Mining and Geology, Hanoi, Vietnam
    2 North Central Geological Division, Nghe An, Vietnam
    3 Institute of Geological Sciences - Vietnam Academy of Science and Technology, Hanoi, Vietnam

  • *Corresponding:
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  • Received: 18th-Sept-2024
  • Revised: 20th-Dec-2024
  • Accepted: 30th-Dec-2024
  • Online: 1st-Feb-2025
Pages: 21 - 30
Views: 139
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Abstract:

Diorite and granodiorite of the Dien Binh Complex are distributed in the western margin of the Kon Tum Massif and are believed to have formed in relation to the subduction of ancient oceanic lithosphere under the Kon Tum Massif during the Early Paleozoic. Although some previous studies have investigated the timing of Dien Binh magmatic emplacement, however, its tectonic setting and significance in regional tectonics remain controversial. This paper presents new U-Pb zircon age dating results from two granodioritic samples of the Dien Binh complex collected in the west of Kon Tum province. The 206Pb/238U weighted mean ages are 441.4 ± 1.8 Ma (2σ, MSWD =1.4, n=16) and 446.2 ± 1.9 Ma (2σ, MSWD=0.93, n=12). The new age data together with previously analyzed age data from the magmatic complex indicate that the I-type granodiorite of the Dien Binh complex has formed during ca. 438 – 455 Ma, which is coeval with the Tra Bong I-type granodiorite (ca. 440 – 447 Ma), Chu Lai S-type granite (ca. 430 – 452 Ma) in the Kon Tum Massif. In combination of the timing of Early Paleozoic magmatism (e.g., S-type granite), regional metamorphism, and sedimentary stratigraphy in the Indochina Block supports that the amalgamation of the Kon Tum Massif and the Truong Son Belt began around the late Middle Ordovician to the early Late Ordovician. The analysis results in this study, combined with regional geological data, confirm the existence of coeval I-type and S-type magmatic rocks that were formed during the post-collision orogeny along the Tam Kỳ - Phước Sơn suture zone.

How to Cite
Ngo, T.Xuan, Luong, K.Quang, Bui, H.Vinh, Bui, H.Thu Thi, Vu, D.Anh, Dinh, T.Trong, Ngo, C.Kim Thi and Pham, D.Thi 2025. U-Pb Zircon ages of Granodiorits of the Dien Binh complex in the Kon Tum massif and its tectonic significances (in Vietnamese). Journal of Mining and Earth Sciences. 66, 1 (Feb, 2025), 21-30. DOI:https://doi.org/10.46326/JMES.2025.66(1).03.
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