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Govindaiah, S.
- Ore Petrology of the V-Ti Magnetite (Lodestone) Layers of the Kurihundi Area of Sargur Schist Belt, Dharwar Craton
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Authors
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1 Department of Studies in Geology, University of Mysore, Manasagangothri, Mysore - 570 006, IN
1 Department of Studies in Geology, University of Mysore, Manasagangothri, Mysore - 570 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 1 (2009), Pagination: 58-68Abstract
The V-Ti magnetite layers (lodestone) occur within the layered gabbro-anorthosites-ultramafic rocks emplaced into the migmatitic gneisses close to the high grade Archeaen Sargur supracrustal rocks in the Kurihundi area. The ore petrographic studies of the lodestone reveal the presence of primary Ti-magnetite, ilmenite, ulvospinel, pleonaste, hematite and pyrite, chalcopyrite, pyrrhotite and secondary Ti-maghemite, martite and goethite as well as secondary covellite. These layers contain Ti-magnetite (60%) and ilmenite (30%) with silicates (<5%) exhibiting granular mosaic texture with well-defined triple junctions and are classified as adcumulus rocks. The grain-boundary relationships in the ores indicate considerable postcumulus growth and readjustment due to combined effects of sintering and adcumulus growth. Intergrowth textures (ulvospinel, ilmenite and pleonaste in Ti-magnetite and hematite in ilmenite) reflects exsolution features crystallized from solid-solutions compositions under different conditions of oxygen fugacities. Larger bodies of pleonaste and ilmenite in Ti-magnetite become lensoid or rounded in outline and these morphological modifications took place during the regional upper amphibolite to lower granulite facies metamorphism at 2.6 Ga ago. The lodestone contains high TiO2 (20 to 22.59 wt%), with V2O5 (0.85 to 1.15%) and Fe2O3 t (72.03 to 74.25%). Ti-magnetite shows alteration to Ti-maghemite, martite and goethite due to low temperature oxidation and hydration during weathering.Keywords
V-Ti Magnetite, Sargur Schist Belt, Microintergrowths, Amphibolite-Granulite Facies Metamorphism, Kurihundi, Dharwar Craton, Karnataka.
References
- BUDDINGTON, A.F. and LINDSLEY, D.H. (1964) Iron-titanium oxide minerals and their synthetic equivalents. Jour. Petrology, v.5, pp.310-357.
- CHAKRABORTY, K.L., JISHU ROY and TAPAN MAJUMDER (1988) Structures and textures of vanadium-bearing titaniferous magnetite ores and their interpretation. Jour. Geol. Soc. India, v.31, pp.305-313.
- CHADWICK, B., RAMAKRISHNAN, M. and VISWANATHA, M.N. (1978) Structural and metamorphic relations between Sargur and Dharwar supracrustal rocks and Peninsular gneiss in central Karnataka. Jour. Geol. Soc. India, v.19, pp.531-549.
- COMPBELL, I.H. (1978) A study of cumulate processes and macrorhythmic layering in the Jimberlana Layered Intrusin of Western Australia. Part I: The upper layered series. Jour. Petrology, v.118, pp.183-215.
- DUCHESNE, J.C. (1970) Microtextures of Fe-Ti oxide minerals in the South Rogaland anorthositic complex (Norway). Ann. Soc. Geol. Belgique, v.93, pp.197-251.
- GOVINDAIAH, S., PATHAN, A.M. and NAGANNA, C. (1989) Textural features of V-Ti magnetite deposits of area around Masanikere, Shimoga greenstone belt, India. Jour. Indian Acad. Geosciences, v.32, pp.1-14.
- GOVINDAIAH, S., JAGADEESH, C. and SURESH, B. (2007) Microstructural evolution of V-Ti magnetite layers of Devarnarasipur ultramafic-mafic complex in Shimoga schist belt of Dharwar craton, India. Indian Minerals, v.41, no.2, pp.144-152.
- HAGGERTY, S.E. (1976) Opaque mineral oxides in terrestrial igneous rocks. In: D. Rumble (Ed.), Oxide Minerals. Min. Soc. Amer. Short Course Notes, pp.101-300.
- IRVINE, T.N. (1982) Terminolgy for layered intrusions. Jour. Petrolrology, v.23, pp.127-162.
- LAKSHMIPATHAIAH, H.K., GOVINDAIAH, S. and SRIKANTAPPA, C. (2006) Chemistry and subsolidus re-equilibration of V-Ti magnetite ores in the southeastern part of Shimoga schist belt, Dharwar craton, India. Jour. Appld. Geochemistry, v.8, No.1, pp.11-24.
- MONANTY, J.K. and PAUL, A.K (2008) Fe-Ti-oxide ore of the Mesoarchaean Nuasahi ultrmafic-mafic complex, Orissa and its utilization potential. Jour. Geol. Soc. India, v.72, pp.623-633.
- RADHAKRISHNA, B.P. PANDIT, S.A. and PRABHAKAR, K.T. (1973) Copper mineralization in the ultramafic complex of Nuggihalli, Hassan district, Mysore state. Jour. Geol. Soc. India, v.14, pp.302-312.
- RAMDOHR, P. (1980) The ore minerals and their intergrowths (English Tanslation), Pergamon Press, London, v.2, pp.982-992.
- RAMAKRISHNAN, M., VISWANATHA, M.N., CHAYAPATHI, N. and NARAYAN KUTTY, T.R. (1978) Geology and geochemistry of anorthosites of Karnataka craton and their tectonic significance. Jour. Geol. Soc. India, v.19, No.3, pp.115-134.
- RAMAKRISHNAN, M. and VAIDYANADHAN, R. (2008) Geology of India. Geol. Soc. India, Bangalore, v.1, pp.109-110
- RANGANATHAN, N., VENKOBA RAO, N. and RAGHUNATHA Reddy, S.L. (1991) Note on a new "lodestone"- (titanomagnetite) band from the Sargur terrain, Dharwar craton. Jour.Geol. Soc. India, v.37, pp.407-409.
- REYNOLDS, I.M. (1986) The mineralogy and ore petrography of Bushveld Titaniferous magnetite-layers. In: C.R. Anhaeusser and S. Maske (Eds.), Mineral deposits of S.Africa. Vols. I and II, Geol. Soc. S. Africa. Johannesburg. pp. 1267-1286.
- REYNOLDS, I.M. (1985a) Ore petrology of some vanadium-bearing titaniferous iron ores of Rooiwater Complex, northeastern Transvaal. In: C.R. Anhaeusser and S. Maske (Eds.), Mineral deposits of S.Africa Vol.I and II, Geol. Soc. S. Africa, Johannesburg.
- REYNOLDS, I.M. (1978a) Mineralogical studies of South African titniferous iron ores: Their application to extractive metallurgy. Trans. Geol. Soc. S. Africa, v.81, pp.233-240.
- REYNOLDS, I.M. (1979b) Grain boundary relationships in some Busveld titaniferous magnetite cumulates (Abstr.). Proc. 18th Congr. Geol. Soc. S. Africa, pp.297-299.
- SMITH, J.V. and STEELE, I.M. (1976) Lunar mineralogy; a heavenly detective story. Part II, Amer. Miner., v.61, pp.1059-1116.
- SRIKANTAPPA, C., HORMANNA, P.K. and RAITH, M. (1984) Petrology and Geochemistry of layered ultramafic to mafic complexes from the Archaean craton of Karanataka, Southern India. In: A. Kroner et al. (Eds.), Archaean Geochemistry. Springer- Verlag, Berlin, Heidelberg, pp.138-157.
- SCHWELLNUS, C.M. and WILLEMSE, J. (1943) Titanium and vanadium in the magnetic iron ores of the Bushveld Complex. Trans. Geol. Soc. S. Afr., v.46, pp23-38.
- SWAM NATH, J., RAMAKRISHNAN, M. and VISWANATHA, M.N. (1974) Dharwar stratigraphic model and Karnataka craton evolution. Rec. Geol. Surv. India, v.107(2), pp.149-175.
- VERNON, R.H. (1976) Metamorphic Processes; Reactions and microstructure development. George Allen and Unwin Ltd., London, 274p.
- VINAYAKA, S., GOVINDAIAH, S. and PATHAN, A.M. (1999) Textural features of chromites and V-Ti magnetite layers in the ultramafic-mafic complex of the Nugihalli schist belt, Dharwar craton, India. Indian Minerals, v.33, No.1, pp.113-143.
- WAGER, R.L., BROWN, G.M. and WADSWORTH,W.J. (1960) Types of igneous cumulates. Jour. Petrology, v.1, pp.73-85.