Weathering of ilmenite from Chavara deposit and its comparison with Manavalakurichi placer ilmenite,southwestern India |
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| Authors: | Ajith G Nair DS Suresh Babu KT Damodaran R Shankar CN Prabhu |
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| Institution: | 1. School of Earth and Environmental Sciences, Seoul National University, Seoul 151-747, Republic of Korea;2. Department of Energy Resources Engineering, Chosun University, Gwangju 501-759, Republic of Korea;3. Department of Geological Sciences, Pusan National University, Pusan 609-735, Republic of Korea;1. Minerals Section, Materials Science and Technology Division, National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Council of Scientific & Industrial Research, Thiruvananthapuram, Kerala, India;2. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, India;3. Department of Geology, National College, Trichy, Tamil Nadu, India;4. Department of Geology, School of Earth Sciences, Central University of Karnataka, Gulbarga, Karnataka, India;1. Department of Earth and Planetary Sciences, Birkbeck University of London, Malet Street, London WC1E 7HX, UK;2. Hanoi University of Mining and Geology, 18 Vien Street, Duc Thang ward, Bac Tu Liem District, Hanoi, Vietnam;3. Geophysical Division of Vietnam, No1, 95, Chien Thang Street, Van Quan ward, Ha Dong District, Hanoi, Vietnam;4. Vietnam Administration of Sea and Islands, 83 Nguyen Chi Thanh Street, Dong Da District, Hanoi, Vietnam |
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| Abstract: | The magnetic fractions of ilmenite from the beach placer deposit of Chavara, southwest India have been studied for mineralogical and chemical composition to assess the range of their physical and chemical variations with weathering. Chavara deposit represents a highly weathered and relatively homogenous concentration. Significant variation in composition has been documented with alteration. The most magnetic of the fractions of ilmenite, separated at 0.15 Å, and with a susceptibility of 3.2 × 10?6 m3 kg?1, indicates the presence of haematite–ilmenite intergrowth. An iron-poor, titanium-rich component of the ilmenite ore has been identified from among the magnetic fractions of the Chavara ilmenite albeit with an undesirably high Nb2O5 (0.28%), Cr2O3 (0.23%) and Th (149 ppm) contents. The ilmenite from Chavara is compared with that from the nearby Manavalakurichi deposit of similar geological setting and provenance. The lower ferrous iron oxide (2.32–14.22%) and higher TiO2 (56.31–66.45%) contents highlight the advanced state of alteration of Chavara. This is also evidenced by the relatively higher Fe3+/Fe2+ ratio compared to Manavalakurichi ilmenite. In fact, the ilmenite has significantly been converted to pseudorutile/leucoxene. |
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