Crustal anatexis and formation of two types of granitic magmas in the Kontum massif, central Vietnam: Implications for magma processes in collision zones

M. Owada, Y. Osanai, N. Nakano, T. Matsushita, Ngoc Nam Tran Ngoc Nam, T. Tsunogae, T. Toyoshima, Pham Binh, H. Kagami

研究成果: Contribution to journalArticle査読

42 被引用数 (Scopus)

抄録

Asia grew in the Late Permian by the collision of a number of micro-continents. Syn- to post-collisional magmatism occurred along the continental collision zones . In this study, we report two types of granitic rocks, garnet granite (Grt granite) and orthopyroxene granite (Opx granite), from the Kontum massif, central Vietnam, which is situated on the continental collision zone between the South China and Indochina cratons. These granitic rocks were formed at ca. 250 Ma when high-temperature (HT) and ultrahigh-temperature (UHT) metamorphism took place in the same zone. Based on the petrological and geochemical features compared with previously reported experimental results, garnet-bearing granite is derived from pelitic gneisses by partial melting, whereas orthopyroxene-bearing granite is produced by the partial melting of garnet-bearing mafic granulites. We inferred that a significantly high-geothermal gradient is required to produce Vietnamese granitic magmatism and related HT to UHT metamorphism. This geotherm may be attributed to upwelling mantle plume beneath the Kontum massif during the Late Permian.

本文言語英語
ページ(範囲)428-437
ページ数10
ジャーナルGondwana Research
12
4
DOI
出版ステータス出版済み - 11 2007

All Science Journal Classification (ASJC) codes

  • Geology

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