Abstract
A representative collection (138 analyses) of chromites from kimberlites of the Botuobinskaya pipe in Yakutia was studied. With allowance for the Cr, Ti, and Al contents, the chromites are subdivided into the low-Cr aluminous group A and the high-Cr and high-Ti group B. The chromites of group A with their compositional variations controlled by the Al3+-Cr3+ isomorphism are not related to kimberlite in composition and reveal attributes of restites. The chromites of group B with heterovalent Ti4+ + Fe2+ + Fe3+-3Cr3+ isomorphism vary in their composition in line with the compositional variations of kimberlites, thus demonstrating their primary magmatic origin. The chromites of the second group crystallized simultaneously with olivines from kimberlites, and both minerals could have formed nodules of spinel dunite.
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Original Russian Text © V.A. Minin, V.P. Prugov, N.M. Podgornykh, S.V. Kovyazin, L.D. Kholodova, 2010, published in Zapiski RMO (Proceedings of the Russian Mineralogical Society), 2010, No. 3, pp. 54–72.
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Minin, V.A., Prugov, V.P., Podgornykh, N.M. et al. Composition of chromites from kimberlites of the Botuobinskaya pipe in Yakutia. Geol. Ore Deposits 53, 626–638 (2011). https://doi.org/10.1134/S1075701511070130
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DOI: https://doi.org/10.1134/S1075701511070130