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

Maria Rampilova, Anna Doroshkevich, Shrinivas Viladkar, Elizaveta Zubakova

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number355
JournalMinerals
Volume11
Issue number4
DOIs
Publication statusPublished - Apr 2021

Keywords

  • Benstonite
  • Calcioburbankite
  • Dolomite carbonatites
  • India
  • Norsethite
  • Pyrochlore
  • Sevathur

OECD FOS+WOS

  • 1.05 EARTH AND RELATED ENVIRONMENTAL SCIENCES
  • 1.05.KY GEOLOGY
  • 1.05.GC GEOCHEMISTRY & GEOPHYSICS
  • 1.05.RE MINERALOGY

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