Occurrence and emplacement of chromite ores in Sindhudurg district, Maharashtra, India
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Date
2010Author
Iyer, S.D.
Babu, E.V.S.S.K.
Mislankar, P.G.
Gujar, A.R.
Ambre, N.V.
Loveson, V.J.
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In the present study, the occurrence and emplacement of chromite ore deposits from two abandoned mines (Kankavali (Janoli) and Wagda) in the Sindhudurg district of Maharashtra, India are presented. These ores, that occurred as lenses and are associated with metamorphic and ultrabasic rocks, consist of octahedral grains of chromite, while clinochlore is present between the interstices of these grains. The Kankavali (janoli) and Wagda ores revealed a dominance of Cr sub(2) O sub(3) followed by FeO and variable proportions of Al sub(2) O sub(3), MgO, and SiO sub(2). The former deposits have a slightly higher Cr sub(2) O sub(3) (average 52 wt %) and FeO (approx. 18 wt %) than those from Wagda (Cr sub(2) O sub(3) approx. 50 wt %, FeO approx. 25 wt %). The similar Cr values (0.73) for Kankavali (Janoli), 0.74 for Wagda) correspond to those reported for typical podiform-type chromite deposits. It is suggested that the ores were emplaced as phacoliths in folded outcrops with a steep easterly dip and northwest-southeast trend. It is postulated that the continuation of the fold structure from Janoli to Wagda (approx. 4.5 km apart) and the probable (sporadic) occurrence of chromite along this stretch. The possibility of the contribution of chromite grains from these areas to the coastal placer deposits cannot be ruled out.
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