TY - JOUR

T1 - Mineralogy of dolomite carbonatites of Sevathur complex, Tamil Nadu, India

AU - Rampilova, Maria

AU - Doroshkevich, Anna

AU - Viladkar, Shrinivas

AU - Zubakova, Elizaveta

N1 - Funding Information: Funding: The investigations were supported by the Russian Science Foundation (RSF), project # 19-17-00019. Funding Information: Acknowledgments: Analytical equipment for this study was provided by the Analytical Center for Multi-Elemental and Isotope Research Siberian Branch, Russian Academy of Science (Novosibirsk, Russia), “Analytical Center of Mineralogical, Geochemical and Isotope Studies” at the Geological Institute, Siberian Branch of the Russian Academy of Sciences (Ulan-Ude, Russia). The work was done on state assignment of IGM SB RAS (0330-2016-0002) and GIN SB RAS (AAAA-A21-121011390002-2). Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/4

Y1 - 2021/4

N2 - The main mass of the Sevathur carbonatite complex (Tamil Nadu, India) consists of dolomite carbonatite with a small number of ankerite carbonatite dikes. Calcite carbonatite occurs in a very minor amount as thin veins within the dolomite carbonatite. The age (207Pb/204Pb) of the Sevathur carbonatites is 801 ± 11 Ma, they are emplaced within the Precambrian granulite ter-rains along NE–SW trending fault systems. Minor minerals in dolomite carbonatite are fluorapatite, phlogopite (with a kinoshitalite component), amphibole and magnetite. Pyrochlore (rich in UO2), monazite-Ce, and barite are accessory minerals. Dolomite carbonatite at the Sevathur complex con-tains norsethite, calcioburbankite, and benstonite as inclusions in primary calcite and are interpreted as primary minerals. They are indicative of Na, Sr, Mg, Ba, and LREE enrichment in their parental carbonatitic magma. Norsethite, calcioburbankite, and benstonite have not been previously known at Sevathur. The hydrothermal processes at the Sevathur carbonatites lead to alteration of pyrochlore into hydropyrochlore, and Ba-enrichment. Also, it leads to formation of monazite-(Ce) and barite-II.

AB - The main mass of the Sevathur carbonatite complex (Tamil Nadu, India) consists of dolomite carbonatite with a small number of ankerite carbonatite dikes. Calcite carbonatite occurs in a very minor amount as thin veins within the dolomite carbonatite. The age (207Pb/204Pb) of the Sevathur carbonatites is 801 ± 11 Ma, they are emplaced within the Precambrian granulite ter-rains along NE–SW trending fault systems. Minor minerals in dolomite carbonatite are fluorapatite, phlogopite (with a kinoshitalite component), amphibole and magnetite. Pyrochlore (rich in UO2), monazite-Ce, and barite are accessory minerals. Dolomite carbonatite at the Sevathur complex con-tains norsethite, calcioburbankite, and benstonite as inclusions in primary calcite and are interpreted as primary minerals. They are indicative of Na, Sr, Mg, Ba, and LREE enrichment in their parental carbonatitic magma. Norsethite, calcioburbankite, and benstonite have not been previously known at Sevathur. The hydrothermal processes at the Sevathur carbonatites lead to alteration of pyrochlore into hydropyrochlore, and Ba-enrichment. Also, it leads to formation of monazite-(Ce) and barite-II.

KW - Benstonite

KW - Calcioburbankite

KW - Dolomite carbonatites

KW - India

KW - Norsethite

KW - Pyrochlore

KW - Sevathur

UR - http://www.scopus.com/inward/record.url?scp=85103096053&partnerID=8YFLogxK

U2 - 10.3390/min11040355

DO - 10.3390/min11040355

M3 - Article

AN - SCOPUS:85103096053

VL - 11

JO - Minerals

JF - Minerals

SN - 2075-163X

IS - 4

M1 - 355

ER -