Occurrence of Népouite in the Serpentinite of the Manipur Ophiolite Belt, Northeastern India: Implication for Melt-Rock Interaction in a Supra-Subduction Zone

Authors

  • Thungyani N. Ovung
     Department of Geology, University of Calcutta, 35 B.C. Road, Kolkata - 700 019
  • Jyotisankar Ray
     Department of Geology, University of Calcutta, 35 B.C. Road, Kolkata - 700 019
  • Biswajit Ghosh
     Department of Geology, University of Calcutta, 35 B.C. Road, Kolkata - 700 019
  • Debabrata Mandal
     Department of Instrumentation Science, Jadavpur University, Kolkata - 700 032
  • Pallab Dasgupta
     Department of Instrumentation Science, Jadavpur University, Kolkata - 700 032
  • Madhuparna Paul
     Department of Geology, University of Calcutta, 35 B.C. Road, Kolkata - 700 019

DOI:

https://doi.org/10.1007/s12594-017-0693-9

Abstract

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 %, SiO2= 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.

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Issue

Volume 90, Issue 2, August 2017 Pages (129-258)

Section

Research Articles

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Published

2017-08-01

How to Cite

Ovung, T. N., Ray, J., Ghosh, B., Mandal, D., Dasgupta, P., & Paul, M. (2017). Occurrence of Népouite in the Serpentinite of the Manipur Ophiolite Belt, Northeastern India: Implication for Melt-Rock Interaction in a Supra-Subduction Zone. Journal of Geological Society of India, 90(2), 154–158. https://doi.org/10.1007/s12594-017-0693-9
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