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dc.contributor.authorChaubey ,M.
dc.contributor.authorSingh ,A.K. Imtisunep ,S.
dc.contributor.authorIbrahim, U.
dc.contributor.authorSingh ,B.P.
dc.contributor.authorSatyanarayanan ,M.
dc.contributor.authorLongchar ,B.
dc.contributor.authorShoraisam, K.S.
dc.date.accessioned2025-03-07
dc.date.accessioned2025-03-19T11:32:06Z
dc.date.available2025-01-17
dc.date.available2025-03-19T11:32:06Z
dc.date.issued2025
dc.identifier.citationInternational Geology Review, Vol.67(2);2025; 210 232
dc.identifier.issn0020-6814
dc.identifier.otherhttps://doi.org/10.1080/00206814.2024.2386565
dc.identifier.uridoi: 10.1080/00206814.2024.2386565
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9401
dc.descriptionIF2023= 2.1
dc.description.abstractThe Nagaland-Manipur ophiolites (NMO), part of the Phanerozoic (538.8?0?Ma) Tethyan ophiolites, occur in the NNE-SSW trending Indo-Myanmar Orogenic Belt (IMOB), northeast India. The NMO hosts both high-Al (0.46 < Cr# < 0.53) and high-Cr chromitites (0.71 < Cr# < 0.79). These chromitite bodies are hosted in lherzolite, harzburgite, and dunite and show various textures, including massive, disseminated, nodular, and granular. The high-Al chromitite compositions in conjunction with the calculated Al2O3[melt] (15.66?16.39?wt.%), TiO2[melt] (0.65?0.94?wt.%), and FeO/MgO[melt] (0.65?0.83?wt.%) values indicate that they were derived from the tholeiitic melt that formed at the mid-ocean ridge centre through low-degree partial melting. In contrast, the high-Cr chromitites, coupled with the Al2O3[melt] (11.24?12.99?wt.%), TiO2[melt] (0.21?0.33?wt.%), and FeO/MgO[melt] (0.58?1.54) values show similar geochemical affinities to those derived from boninitic melts produced by partial melting of already depleted mantle due to the subduction of oceanic plate in a supra-subduction zone environment. The total platinum group element (PGE) contents (60?190 ppb) of high-Al chromitites are lower than the total PGE contents (118?2341 ppb) in high-Cr chromitites. Chondrite-normalized PGE patterns in high-Al chromitites are flat from Os to Rh and negatively sloping from Rh to Pd, whereas high-Cr chromitites show strongly fractionated chondrite-normalized PGE patterns. Total PGE contents and low Pd/Ir ratios (0.02?0.64) of chromitites are consistent with typical ophiolitic chromitites. Mineral chemistry and PGE systematics suggest that NMO chromitites were generated in two separate tectonic settings. Thus, we argue that the upper mantle of the NMO of the IMOB has been modified by a substantial amount of supra-subduction zone components after initially being formed in a mid-ocean ridge tectonic environment
dc.languageen
dc.publisherTaylor & Francis
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleFormation of the associating high-Al and high-Cr chromitites in the Nagaland-Manipur Ophiolites in northeast India
dc.typeJournal Article
dc.affiliation.authorPetrology and Geochemistry Group, Wadia Institute of Himalayan Geology, Dehradun, India


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