On some geochemical features of the vanadiferous magnetite deposits of Kumhardubi and Betjharan, Mayurbhanj District, Orissa, India

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doi: 10.1016/0009-2541(84)90053-6
Authors:Banerji, P. K.
Author Affiliations:Primary:
Geol. Surv. India, Orissa, India
Volume Title:Chemical Geology
Source:Chemical Geology, 43(3-4), p.257-269. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:1984
Note:In English; illus. incl. 7 tables, 1 plates
Summary:The magnetite-ilmenite ore bodies of Mayurbhanj, India, show erratic fluctuations in vanadium content (0.3-1.6%) even at near-constant magnetite concentrations. The ore masses were later infiltrated along grain boundaries at higher f O2 by haematite followed by alumina-rich chlorite. Supergene alteration of the magnetite to maghemite is patchily developed. Electron probe analyses indicate that the bulk of vanadium is in the magnetite-maghemite phase. No separate vanadium mineral has been identified. Erratic V concentration, within the ore bodies appears to be a product of: (a) variable exchange reactions between the silicate host and the late magmatic Fe-rich fluids, the smaller masses getting more depleted in V than the cores of larger segregations; and (b) subtle variability of V3+/V4+ in site preference within the Fe3O4-Fe2TiO4 mix-crystals, as the threshold of solidus was being crossed under fluctuating f O2. [P.Br.]
Subjects:Anorthosite; Chlorite; Chlorite group; Composition; Economic geology; Electron probe data; Gabbroic anorthosite; Gabbros; Geochemistry; Hematite; Igneous rocks; Iron ores; Maghemite; Magnetite; Metal ores; Metals; Oxides; Paleoproterozoic; Plutonic rocks; Precambrian; Proterozoic; Sheet silicates; Silicates; Trace elements; Upper Precambrian; Vanadium; X-ray data; Asia; India; Indian Peninsula; Mayurbhanj India; Orissa India; Betjharan; Gorumahisani Barded Iron Formation; Ilmentite; Kumhardubi
Coordinates:N174000 N223000 E0873000 E0812000
Abstract Numbers:84M/4076
Record ID:1985013746
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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