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<p>Crustal melting, represented by migmatite formed at various stages of orogenesis and in regions of thinned crust, plays a key role in understanding tectonic history. Migmatitic rocks are widespread in the Kon Tum massif, the southeastern part of Indochina, but their timing is still poorly constrained. The zircon (SIMS) U–Pb dating of representative migmatitic rocks and anatectic leucosome reveal three stages of crustal partial melting in the Kon Tum massif. These partial melting events involved three distinct geodynamic settings. The first one occurred at 450–440&#xa0;Ma during Early Paleozoic collisional orogeny between Viet-Lao and Viet-Cambodia blocks along the Tam Ky-Phuoc Son suture. The newly identified second event took place at 370–360&#xa0;Ma and was plausibly linked to the break-off of the Indochina-South China continent from the north rim of Gondwana. The third partial melting event, volumetrically the most developed, occurred as early as 260–250&#xa0;Ma. This event involved the underplating magmatism and the extensional exhumation of the Kon Tum lower–middle crust.</p>

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Multiphase tectonothermal events in the Indochina block, viewed from migmatitic rocks of the Kon Tum massif

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Hoai Thi Thu Luong,
  • Vuong Van Nguyen,
  • Michel Faure,
  • Wei Lin

摘要

Crustal melting, represented by migmatite formed at various stages of orogenesis and in regions of thinned crust, plays a key role in understanding tectonic history. Migmatitic rocks are widespread in the Kon Tum massif, the southeastern part of Indochina, but their timing is still poorly constrained. The zircon (SIMS) U–Pb dating of representative migmatitic rocks and anatectic leucosome reveal three stages of crustal partial melting in the Kon Tum massif. These partial melting events involved three distinct geodynamic settings. The first one occurred at 450–440 Ma during Early Paleozoic collisional orogeny between Viet-Lao and Viet-Cambodia blocks along the Tam Ky-Phuoc Son suture. The newly identified second event took place at 370–360 Ma and was plausibly linked to the break-off of the Indochina-South China continent from the north rim of Gondwana. The third partial melting event, volumetrically the most developed, occurred as early as 260–250 Ma. This event involved the underplating magmatism and the extensional exhumation of the Kon Tum lower–middle crust.