Occurrence of népouite in the serpentinite of the Manipur ophiolite belt, Northeastern India: Implication for melt-rock interaction in a supra-subduction zone

Serpentinization is pervasive in the ultramafic rocks of Manipur ophiolite belt (MOB), Northeastern India. Electron microprobe data of a serpentinite from the Ukhrul-Nungbi sector of MOB shows Ni-rich serpentine mineral (NiO = 33.4-33.9 wt %, SiO 2 = 37.55-38.96 wt %, MgO= 14.83-16.89 wt %). The com...

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Bibliographic Details
Published inJournal of the Geological Society of India Vol. 90; no. 2; pp. 154 - 158
Main Authors Ovung, Thungyani N., Ray, Jyotisankar, Ghosh, Biswajit, Mandal, Debabrata, Dasgupta, Pallab, Paul, Madhuparna
Format Journal Article
LanguageEnglish
Published Springer India Geological Society of India 01.08.2017
Springer Nature B.V
Subjects
Composition
Diffraction
Diffraction patterns
Earth and Environmental Science
Earth Sciences
Electron microprobe
Geology
Hydrogeology
Hydrothermal alteration
Magnesium oxide
Olivine
Peridotite
Rocks
Serpentine
Serpentinite
Serpentinization
Silicon dioxide
Subduction
Subduction zones
Ultramafic rocks
X-ray diffraction
X-rays
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Summary:Serpentinization is pervasive in the ultramafic rocks of Manipur ophiolite belt (MOB), Northeastern India. Electron microprobe data of a serpentinite from the Ukhrul-Nungbi sector of MOB shows Ni-rich serpentine mineral (NiO = 33.4-33.9 wt %, SiO 2 = 37.55-38.96 wt %, MgO= 14.83-16.89 wt %). The composition and X-ray diffraction pattern characterize this Ni-rich serpentine mineral as népouite which is suggested to be a hydrothermal alteration product of NiO-rich olivine in a fore-arc peridotite. The genesis of this NiO-rich olivine is attributed to the melt-rock interaction in a supra-subduction zone setting.
ISSN:0016-7622
0974-6889
DOI:10.1007/s12594-017-0693-9