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Magmatic and post-magmatic evolution of the Newania carbonatite complex, Rajasthan, north-western India

Published online by Cambridge University Press:  08 August 2023

Amritpaul Singh ,
Roger H. Mitchell Open the ORCID record for Roger H. Mitchell [Opens in a new window] ,
Gurmeet Kaur  and
D. Srinivasa Sarma Open the ORCID record for D. Srinivasa Sarma [Opens in a new window]
Amritpaul Singh*
Affiliation:
Department of Geology, Panjab University, Chandigarh, India
Roger H. Mitchell
Affiliation:
Department of Geology, Lakehead University, Thunder Bay Ontario, Canada
Gurmeet Kaur
Affiliation:
Department of Geology, Panjab University, Chandigarh, India
D. Srinivasa Sarma
Affiliation:
CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad, India
*
Corresponding author: Amritpaul Singh; Email: apsbhatti05@gmail.com
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Abstract

This work describes the mineralogy of dolomite carbonatite occurring at the Newania carbonatite complex, Rajasthan, north-western India. The mineralogy records the textural and compositional features of magmatic and post-magmatic stages of carbonatite evolution. Ferroan dolomite is the principal constituent and displays variable degrees of deformation, ranging from brittle-to-ductile deformation regimes. Apatite exhibits textural and compositional evolutionary trends from early-to-late stages of carbonatite evolution. Two varieties of amphibole are reported for the first time from this complex, ferri-winchite and cummingtonite; the former is magmatic and the latter is metamorphic in origin. The columbite–tantalite-series minerals are columbite-(Fe), and their paragenesis evolves from composite grains with pyrochlore to individual crystals. Pyrochlore is magmatic with U–Ta–Ti-rich compositions and shows evolution from calciopyrochlore to kenopyrochlore, followed by alteration during late-stages of carbonatite evolution. Monazite and baryte constitute the post-magmatic mineral assemblage; the former is hydrothermal and crystallised after precursor apatite, whereas the latter is associated exclusively with columbite–pyrochlore composites. On the basis of the mineralogy of the carbonatite, it is concluded that the parent magma was generated by low-degree partial melting of magnesite–phlogopite-bearing peridotite.

Keywords

carbonatitemineralogyNewaniaAravalli CratonRajasthanIndia
Type
Article
Information
Mineralogical Magazine , Volume 87 , Issue 5 , October 2023 , pp. 748 - 766
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland

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Footnotes

Associate Editor: Leone Melluso

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