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Ref ID: 26425
Ref Type: Conference Paper
Authors: Lo, C.
Chung, S.
Lee, T.
Lan, C.
Wang, P.
Long, T.
Bao, N.
Title: Thermochronological study of the Kontum Massif, central Vietnam and its implication to tectonothermal events in Indochina
Date: 1999
Source: American Geophysical Union 1999 Fall Meeting
Notes: Information obtained from AGU Fall Meeting Database:
Abstract: The Indochina continent is composed by a tectonic collage formed through successive amalgamation of continental fragments from Paleotethys and Gondwanaland, during the early Triassic. After the Triassic amalgamation (namely Indosinian orogeny), the continent was extruded southeastward along the Ailaoshan-Red River Shear Zone, due to the India-Asian continental collision in the middle Cenozoic time. As one of the Precambrian basement complexes in Indochina, the the Kontum Massif in central Vietnam has attracted much attention from scientists because they potentially exhibit the records not only for the collision events but also the extrusion tectonics. In order to reveal these tectonothermal events, minerals extracted from granulite-facies gneisses and amphibolites in the Kontum Massif were dated by 40Ar/39Ar and U-Pb methods. The newly collected results show that after a major thermal event in late Proterozoic, the Kontoum Massif has experienced a strong thermal overprinting during the early Triassic and then subsequently exhumed to the surface during the late Triassic - Jurassic (240-160 Ma). Thus, it may therefore be concluded that the Indosinian orogeny has not only result in the suturing of the South China and Indochina blocks, but also cause a strong thermal overprinting and exhumation of the Kontum Massif. However, there is no clear indication of thermal overprinting caused by the Cenozoic extrusion tectonics although it has long been recognized as one of the most significant tectonic events in Indochina.
Date Created: 2/13/2012