Permo-Triassic Barrovian-type metamorphism in the ultrahigh-temperature Kontum Massif, central Vietnam: Constraints on continental collision tectonics in Southeast Asia

Nobuhiko Nakano, Yasuhito Osanai, Masaaki Owada, Yasutaka Hayasaka, Tran Ngoc Nam

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

The Kontum Massif in central Vietnam is composed of various metamorphic complexes including a high-temperature southern part (Kannak and Ngoc Linh complexes) and a low- to medium-temperature northern part (Kham Duc complex). The Kham Duc complex exhibits Barrovian-type medium-pressure metamorphism evidenced by kyanite- and/or staurolite-bearing metapelites. The garnet-gedrite-kyanite gneiss, which is the focus of the present study, preserves several mineral parageneses formed during a prograde and retrograde metamorphic history: staurolite + quartz in gedrite, garnet + gedrite + kyanite in the matrix, and spinel + cordierite symplectite between gedrite and sillimanite. The calculated semiquantitative petrogenetic grid reveals peak pressure conditions of 620-650°C at 1.1-1.2GPa and peak temperature conditions of 730-750°C at 0.7-0.8GPa. The monazite U-Th-Pb electron microprobe ages of the garnet-gedrite-kyanite gneiss and associated gneisses yield 246 ± 3 Ma for the Kham Duc complex, which is similar to the age of the high- to ultrahigh-temperature metamorphism in the adjacent Kannak and Ngoc Linh complexes of the southern Kontum Massif. The present results indicate that both the Barrovian-type and ultrahigh-temperature metamorphism occurred simultaneously in the Kontum Massif during an event strongly related to Permo-Triassic microcontinental collision tectonics in Asia.

Original languageEnglish
Pages (from-to)126-143
Number of pages18
JournalIsland Arc
Volume18
Issue number1
DOIs
Publication statusPublished - May 11 2009

All Science Journal Classification (ASJC) codes

  • Geology

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