Titaniferous Magnetite Deposits Associated with Archean Greenstone Belt in the East Indian Sheild
Earth Sciences
Volume 4, Issue 4-1, July 2015, Pages: 15-30
Received: May 4, 2015; Accepted: May 7, 2015; Published: Jul. 29, 2015
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Authors
Riya Mondal, Department of Geological Sciences, Jadavpur University, Kolkata: 700028, West Bengal, India
Tapan Kr. Baidya, Department of Geological Sciences, Jadavpur University, Kolkata: 700028, West Bengal, India
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Abstract
In the East Indian Shield, occurrence of titaniferous magnetite deposits associated with the Archean Greenstone belt occur in Kumhardubi, Betjharan and Nuasahi areas of Odisha and Dublabera area of Jharkhand. The ore bodies comprise lenses, veins, bands and patches within gabbroic rocks. Petrogenetic studies have revealed the primary and secondary mineral constituents of the ores such as titanomagnetite, ilmenite, hematite, spinel, cobaltite, goethite, martite, rutile and silicate gangue minerals. Various crystallographic intergrowths are resulted from exsolution & oxidation at different temperatures during cooling of the sub-solidus magma. Chemical analyses show that the ore contains 10.35 -17.68 wt.% TiO2, 0.148 – 0.227 wt.% V2O3 and 32.75 – 67.39 wt.% Fe2O3. Different geochemical composition diagrams confirm their tholeiitic origin. The formation of the massive ore bodies is referred to late magmatic crystallization from tholeiitic magma followed by Fe-Ti enriched residual liquid injection within the host rocks. Syn to late formation of the magnetite ores along with gabbro-anorthositic intrusive with respect to the Archean Greenstone Belt of East Indian Shield is suggested
Keywords
Magnetite, Archean, Orthomagmatic, Greenstone
To cite this article
Riya Mondal, Tapan Kr. Baidya, Titaniferous Magnetite Deposits Associated with Archean Greenstone Belt in the East Indian Sheild, Earth Sciences. Special Issue: Archean Metallogeny and Crustal Evolution. Vol. 4, No. 4-1, 2015, pp. 15-30. doi: 10.11648/j.earth.s.2015040401.12
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