Complete preservation of ophiolite suite from south Andaman, India: A mineral-chemical perspective

Abhishek Saha, Avik Dhang, Jyotisankar Ray, Suvankar Chakraborty, David Moecher

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15 Scopus citations


Field studies supplemented by petrographic analyses clearly reveal complete preservation of ophiolite suite from Port Blair (11°39′N: 92°45′E) to Chiriyatapu (11°30′24″N: 92°42′30″E)stretch of South Andaman. The ophiolite suite reveals serpentinite at the base which is overlain unconformably by cumulate ultramafic-mafic members with discernible cumulus texture and igneous layering. Basaltic dykes are found to cut across the cumulate ultramafic-mafic members. The succession is capped by well exposed pillow basalts interlayered with arkosic sediments. Olivine from the basal serpentinite unit are highly magnesian (Fo80.1-86.2). All clinopyroxene analyses from cumulate pyroxenite, cumulate gabbro and basaltic dyke are discriminated to be 'Quad' and are uniformly restricted to the diopside field. Composition of plagioclase in different lithomembers is systematically varying from calcic to sodic endmembers progressively from cumulate pyroxenite to pillow basalt through cumulate gabbro and basaltic dyke. Plagioclase phenocrysts from basaltic dyke are found to be distinctly zoned (An60.7-An35.3) whereas groundmass plagioclase are relatively sodic (An33-An23.5). Deduced thermobarometric data from different lithomembers clearly correspond to the observed preservation of complete ophiolite suite.

Original languageEnglish
Pages (from-to)365-381
Number of pages17
JournalJournal of Earth System Science
Issue number3
StatePublished - Jun 2010


  • Geothermobarometry
  • Idealized ophiolite
  • Serpentinite
  • South andaman
  • Zoned plagioclase

ASJC Scopus subject areas

  • Earth and Planetary Sciences (all)


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