Honvang serpentinite body of the Song Ma fault zone, Northern Vietnam: A remnant of oceanic lithosphere within the Indochina-South China suture

N. M. Trung, T. Tsujimori, T. Itaya

    Research output: Contribution to journalArticle

    60 Citations (Scopus)

    Abstract

    The Honvang serpentinite body in the Song Ma fault zone consists mainly of massive serpentinite, altered gabbro and rare chromitite. The serpentinite preserves relict chromian spinel with rare olivine inclusions. The compositional relationship between the Fo content of olivine (Fo90-92) and YCr [atomic ratio Cr/(Cr+Al) = 0.43-0.44] of chromian spinel suggests that the original peridotite was spinel-bearing lherzolitic harzburgite. Chromitite is typically a high-Al type, consisting of chromian spinel with YCr = 0.43-0.44. Saussuritized fine-grained gabbros display nearly flat rare earth element patterns, suggesting MORB-like affinity. Considering this petrotectonic information, we suggest that the serpentinite body of the Song Ma fault zone represents a remnant of paleo-oceanic lithosphere between the Indochina and South China blocks. The lherzolitic harzburgite may have formed in an environment with low degrees of melt depletion in a slow-spreading setting similar to some Tethyan paleo-oceanic lithospheres.

    Original languageEnglish
    Pages (from-to)225-230
    Number of pages6
    JournalGondwana Research
    Volume9
    Issue number1-2
    DOIs
    Publication statusPublished - Jan 1 2006

    Keywords

    • Chromian spinel
    • Serpentinite
    • Song Ma fault zone
    • Suture zone
    • Vietnam

    ASJC Scopus subject areas

    • Geology

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