Timing of metamorphism and formation of garnet granite in the Kontum Massif, central Vietnam: Evidence from monazite EMP dating

Masaaki Owada, Yasuhito Osanai, Tomokazu Hokada, Nobuhiko Nakano

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Garnet-bearing granite (Grt-granite) and high-grade pelitic gneisses occur in the Kannak Complex, southern Kontum Massif, central Vietnam. Electron microprobe (EMP) dating of monazite in Grt-granite and garnet-orthopyroxene gneiss (Grt-Opx gneiss) gave ages of ca. 260 Ma from cores and ca. 230 Ma from thin rims. Since most monazite grains are predominately of core composition, the ca. 260 Ma age indicates the timing of high-temperature metamorphism and the formation of Grt-granite. Grt-granite is locally accompanied by coeval intrusions of fine-grained gabbro, which is a candidate for the heat source leading to high-grade metamorphism and partial melting of the crust during the Late Permian.

Original languageEnglish
Pages (from-to)324-328
Number of pages5
JournalJournal of Mineralogical and Petrological Sciences
Volume101
Issue number6
DOIs
Publication statusPublished - Dec 12 2006

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Vietnam
monazite
granite
dating
electron probe analysis
garnets
garnet
metamorphism
time measurement
electrons
grade
gneiss
gabbro
heat source
heat sources
rims
orthopyroxene
intrusion
partial melting
crusts

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geology

Cite this

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abstract = "Garnet-bearing granite (Grt-granite) and high-grade pelitic gneisses occur in the Kannak Complex, southern Kontum Massif, central Vietnam. Electron microprobe (EMP) dating of monazite in Grt-granite and garnet-orthopyroxene gneiss (Grt-Opx gneiss) gave ages of ca. 260 Ma from cores and ca. 230 Ma from thin rims. Since most monazite grains are predominately of core composition, the ca. 260 Ma age indicates the timing of high-temperature metamorphism and the formation of Grt-granite. Grt-granite is locally accompanied by coeval intrusions of fine-grained gabbro, which is a candidate for the heat source leading to high-grade metamorphism and partial melting of the crust during the Late Permian.",
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T1 - Timing of metamorphism and formation of garnet granite in the Kontum Massif, central Vietnam

T2 - Evidence from monazite EMP dating

AU - Owada, Masaaki

AU - Osanai, Yasuhito

AU - Hokada, Tomokazu

AU - Nakano, Nobuhiko

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