naa a22 4500 510754953 CHVBK 20180411083119.0 cr unu---uuuuu 180411e20130101xx s 000 0 eng 10.1007/s12594-013-0012-z doi (NATIONALLICENCE)springer-10.1007/s12594-013-0012-z Heavy mineral distribution and characterisation of ilmenite of Kayamkulam — thothapally Barrier Island, southwest coast of India [Elektronische Daten] [Babu Nallusamy, Sinirani Babu, D. Suresh Babu] Mineral concentration and ilmenite characterization of the Thothapally — Kayamkulam Barrier Island of the southern Kerala has been studied. 96.86% concentrations of heavy minerals are recorded in the surficial and core samples (4 m) in the southern Kayamkulam and northern Thothapally areas. The total heavy mineral content decreases with depth. The primary heavy mineral suite of the surficial and core samples consists of ilmenite, sillimanite, zircon, garnets, rutile, monazite and magnetite. Longshore current and onshore-offshore movements of sediment during the southwest monsoon are primarily responsible in sorting of the heavy minerals. TiO2 content in ilmenite is significantly higher in the Kayamkulam core sediments than the surface samples. XRD analysis supports intensive weathering and alteration leading to the higher TiO2 concentration. Higher percentage of ferric iron than ferrous iron in the core samples reveals that considerable weathering occurred under burial condition. SEM examination of ilmenite grains reveal the presence of solution pit, chemical leaching, corrosion and replacement textures, supporting the intense epigenetic alteration and weathering under subaerial condition and post-depositional changes by water-table condition. Geological Society of India, 2013 Barrier Island nationallicence Ilmenite nationallicence TiO2 nationallicence SEM nationallicence XRD nationallicence Alteration nationallicence Kerala nationallicence Nallusamy Babu Dept. of Marine Geology and Geophysics, Cochin University of Science and Technology, Fine Arts Avenue, 682 016, Cochin, India aut Babu Sinirani Dept. of Marine Geology and Geophysics, Cochin University of Science and Technology, Fine Arts Avenue, 682 016, Cochin, India aut Suresh Babu D. Marine Science Division, Center for Earth Science Studies, 695 031, Trivandrum, India aut Journal of the Geological Society of India Springer-Verlag 81/1(2013-01-01), 129-140 0016-7622 81:1<129 2013 81 12594 https://doi.org/10.1007/s12594-013-0012-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12594-013-0012-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nallusamy Babu Dept. of Marine Geology and Geophysics, Cochin University of Science and Technology, Fine Arts Avenue, 682 016, Cochin, India aut NATIONALLICENCE 700 1- Babu Sinirani Dept. of Marine Geology and Geophysics, Cochin University of Science and Technology, Fine Arts Avenue, 682 016, Cochin, India aut NATIONALLICENCE 700 1- Suresh Babu D. Marine Science Division, Center for Earth Science Studies, 695 031, Trivandrum, India aut NATIONALLICENCE 773 0- Journal of the Geological Society of India Springer-Verlag 81/1(2013-01-01), 129-140 0016-7622 81:1<129 2013 81 12594 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer