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Ref ID: 28389
Ref Type: Journal Article
Authors: Nam, Tran Ngoc
Title: Thermotectonic events from Early Proterozoic to Miocene in the Indochina craton: implication of K–Ar ages in Vietnam
Date: 1998
Source: Journal of Asian Earth Sciences
DOI: 10.1016/S0743-9547(98)00027-0
Abstract: Synkinematic mineral separates from high-grade metamorphic rocks, which were collected from the Day Nui Con Voi–Red River shear zone and the pre-Mesozoic metamorphic belt south of it, the Da Nang–Khe Sanh shear zone, and the Kontum massif in Vietnam, were dated by K–Ar method. Twenty-four analyses of hornblende, bioitite, and muscovite are clustered into four different groups: Early Proterozoic (ca. 1700–2000 Ma), Early Triassic (ca. 240–258 Ma), Early Cretaceous (115–116 Ma), and Late Oligocene–Early Miocene (24–29 Ma). The K–Ar age data in general indicate cooling ages of ductile deformations and metamorphisms in Vietnam, suggesting an overprinting of thermotectonic events in Indochina from Early Proterozoic to Tertiary, which are generally consistent with tectono–stratigraphic episodes in the region. The data demonstrate that the Indosinian orogeny in Vietnam has occurred during Earliest Triassic times, and Paleozoic orogeny (Caledonian and/or Hercynian) was not inferred by these K–Ar age data.
Date Created: 2/21/2012
Volume: 16
Page Start: 475
Page End: 484