Petrological study of spinel peridotites of Nidar ophiolite, Ladakh Himalaya, India


Petrological study of the ultramafic rocks from the Nidar Ophiolite Complex (NOC) of the Indus Suture Zone is carried out. The study of Cr-spinels along with olivine and pyroxenes emphasizes the genesis and tectonic setting of the ultramafites. Olivine from the harzburgite is Mg-rich, with the molar ratio Mg# [Mg/(Mg + Fe2+)] varying between 0.91 and 0.94 and olivine in dunite between 0.92 and 0.94. Clinopyroxene from the harzburgite is TiO2 and Na2O-poor diopside (Wo47–50En47–50Fs2–4). Spinel in harzburgite shows wide Cr#, molar ratio varied between 0.26 and 0.72, and significantly higher in dunites with Cr# ranges from 0.69–0.85. Cr# of the peridotite spinel follow a depletion trend. Calculated equilibrium conditions of the samples are 800–900°C temperature, 32 and 40 kbar pressure, oxygen fugacity −0.09 to 0.55 log units above the FMQ buffer. Residual nature of the harzburgites and the presence of high and low Cr# spinels may be due to the genetic artifact of the different ultramafic units.

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RN acknowledges financial support from the Department of Science and Technology, Government of India as Fast Track Young Scientist (Grant no. SR/FTP/ES-60/2014). RN gratefully acknowledges Dr Stenzin and his family for all the help and support during the fieldwork at Ladakh. Also grateful to Dr C P Dorjey for the logistics during the fieldwork. The author is thankful to Dr Sakthi Saravanan Chinnasamy for extending his Lab facilities for the execution of the DST project. The manuscript is greatly improved from the thoughtful comments by the anonymous reviewers of the journal and language improvement by Akmaz. The author is indebted to Prof Rajneesh Bhutani, for valuable suggestions and editorial handling.

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Nayak, R., Maibam, B. Petrological study of spinel peridotites of Nidar ophiolite, Ladakh Himalaya, India. J Earth Syst Sci 129, 47 (2020).

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  • Spinel peridotites
  • Nidar Ophiolite Complex (NOC)
  • supra-subduction zone (SSZ)
  • partial melting