Title: Geology and trace element geochemistry of the albitite hosted iron ore mineralization around Khetri copper deposit, India: Implications for an IOA type deposit
Abstract: Numerous occurrences of medium to high grade (44.1 to 65 wt%) pocket type iron ore bodies within the Meso to Neo-Proterozoic albitites and meta-sedimentary rocks are exposed around the south and south-eastern part of the Khetri copper deposit, India. The magnetite-hematite rich iron ore bodies occur as massive, and vein fillings within the albitites/albitized phyllite host. Apatite, sphene, monazite, and REE phases are also associated with iron ore minerals. Sporadic albitite, pegmatite, and quartz-carbonate-fluorite veins are also intruded into the iron ore bodies. The V concentration with <1000 ppm (average 644 ppm) and lower value of Ti (average 88.79 ppm), Cr (average 196.58 ppm), Co (average 84.28 ppm) content measured by Laser Ablation ICP-MS and EPMA, suggest a significant role of the hydrothermal/metasomatic activity for the precipitation of magnetite in the study area. Further, relatively higher Ni/Cr (>1) ratio of magnetite from the study area signifies that the rate of solubility and mobility of Ni is more than Cr in a high-temperature hydrothermal fluid. Fe vs V/Ti plot refers towards the hydrothermal origin of the magnetite and Sn/Ga vs. Al/Co diagram suggests the magnetites have the signature of IOCG deposits. The multi-trace element variation diagram of magnetite is also analogous to the high-temperature hydrothermal origin like IOCG-IOA type deposits. Based on the chemistry, mineral association, and spatial occurrence of the magnetite with albitites (product of Na-metasomatism), the magnetite are considered to have deposited during the regional soda-metasomatism and classified under Iron Oxide Apatite (IOA) clan.
Publication Year: 2021
Publication Date: 2021-07-06
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 4
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