Occurrence and Emplacement of Chromite Ores in Sindhudurg District, Maharashtra, India

• Published in: Acta geologica Sinica (Beijing) Vol. 84; no. 3; pp. 515 - 527
• Main Authors: IYER, Sridhar D., BABU, Elapavalooru V.S.S.K., MISLANKAR, Premchand G., GUJAR, Anup R., AMBRE, Navso V., LOVESON, Victor J.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01-06-2010; National Institute of Oceanography, Council of Scientific and Industrial Research, Dona Paula, Goa 403 004, India%National Geophysical Research Institute, Council of Scientific and Industrial Research, HyderabaD 500007, India%Central Institute of Mining and Fuel Research, Council of Scientific and Industrial Research, Dhanbad 828108, India
• Subjects: chromite; formation; India; placer; podiform; Sindhudurg; 铬矿石; chromite; podiform; formation; placer; Sindhudurg; India
• ISSN: 1000-9515; 1755-6724
• DOI: 10.1111/j.1755-6724.2010.00193.x

In the present study,we present the occurrence and emplacement of chromite ore deposits from two abandoned mines（Kankavali[Janoli]and Wagda） in the Sindhudurg district of Maharashtra,India.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_2O_3 followed by FeO and variable proportions of A1_2O_3,MgO,and SiO_2.The former deposits have a slightly higher Cr_2O_3（average 52 wt%） and FeO（～18 wt%） than those from Wagda（Cr_2O_3～50 wt%,FeO～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.We suggest that the ores were emplaced as phacoliths in folded outcrops with a steep easterly dip and a northwest-southeast trend.We postulate the continuation of the fold structure from Janoli to Wagda（～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.