naa a22 4500 510755623 CHVBK 20180411083121.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s12594-013-0087-6 doi (NATIONALLICENCE)springer-10.1007/s12594-013-0087-6 Features of mineral and chemical composition of the Khamambettu Carbonatites, Tamil Nadu [Elektronische Daten] [M. Burtseva, G. Ripp, A. Doroshkevich, S. Viladkar, Rammohan Varadan] The paper presents mineralogical features and EPMA results of the Khamambettu carbonatites. The mineralogical data suggest that these rocks have been generated in magmatic and hydrothermal stages. Mineral geothermometer for carbonatite give temperatures of 790°-980°C. Fluid inclusion measurements in monazite (hydrothermal stage) give temperatures of 220°-290°C. One of the features of the carbonatites is high content of magnesia that is defined by the presence of dolomite, olivine, spinel, phlogopite, Mg-rich ilmenite. Chloritization, serpentinization, amphibolization, silicification processes and occurrence of barite, monazite-(Ce), strontianite, celestine are related to hydrothermal stage. Hydrothermal minerals at the Khamambettu were formed by recrystallization of primary carbonatite minerals in the presence of Ba, (SO4)2−, REE and Si carried in solution by the hydrothermal fluid. Geological Society of India, 2013 Carbonatite nationallicence EPMA nationallicence Hydrothermal mineralization nationallicence Recrystallization nationallicence Monazite nationallicence Carbonates of REE and strontium nationallicence Khamambettu nationallicence Tamil Nadu nationallicence Burtseva M. Ulan-Ude, Geological Institute SB RAS, Ulan-Ude, Russia aut Ripp G. Ulan-Ude, Geological Institute SB RAS, Ulan-Ude, Russia aut Doroshkevich A. Ulan-Ude, Geological Institute SB RAS, Ulan-Ude, Russia aut Viladkar S. Carbonatite Research Centre, Kadipani, Dist. Baroda, India aut Varadan Rammohan Department of Geology, University of Madras, A.C. College campus, Chennai, India aut Journal of the Geological Society of India Springer-Verlag 81/5(2013-05-01), 655-664 0016-7622 81:5<655 2013 81 12594 https://doi.org/10.1007/s12594-013-0087-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12594-013-0087-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Burtseva M. Ulan-Ude, Geological Institute SB RAS, Ulan-Ude, Russia aut NATIONALLICENCE 700 1- Ripp G. Ulan-Ude, Geological Institute SB RAS, Ulan-Ude, Russia aut NATIONALLICENCE 700 1- Doroshkevich A. Ulan-Ude, Geological Institute SB RAS, Ulan-Ude, Russia aut NATIONALLICENCE 700 1- Viladkar S. Carbonatite Research Centre, Kadipani, Dist. Baroda, India aut NATIONALLICENCE 700 1- Varadan Rammohan Department of Geology, University of Madras, A.C. College campus, Chennai, India aut NATIONALLICENCE 773 0- Journal of the Geological Society of India Springer-Verlag 81/5(2013-05-01), 655-664 0016-7622 81:5<655 2013 81 12594 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer