Abstract
Carbonatites are nominally igneous rocks, whose evolution commonly involves also a variety of postmagmatic processes, including exsolution, subsolidus re-equilibration of igneous mineral assemblages with fluids of different provenance, hydrothermal crystallization, recrystallization and tectonic mobilization. Petrogenetic interpretation of carbonatites and assessment of their mineral potential are impossible without understanding the textural and compositional effects of both magmatic and postmagmatic processes on the principal constituents of these rocks. In the present work, we describe the major (micro)textural characteristics of carbonatitic calcite and dolomite in the context of magma evolution, fluid-rock interaction, or deformation, and provide information on the compositional variation of these minerals and its relation to specific evolutionary processes.
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Acknowledgments
This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) and St. Petersburg State University, Russia (3.38.690.2013, including Geomodel Center). The instrumentation used for data collection was supported by the NSERC. We would like to thank Taseko Mines Ltd. and Rare Element Resources for providing access to their Aley and Bear Lodge properties (respectively). Expert guidance of Jörg Keller at Kaiserstuhl, Jim Clark at Bear Lodge, and Pete Modreski at Iron Hill is most gratefully acknowledged. Most of the samples examined in the present work were collected by authors from outcrop and drill core, but some were loaned to us by the Royal Ontario Museum (Toronto, Canada), Natural History Museum (London, UK), or donated by Francis Ö. Dudás, Meghan A. Moore and Alexey Rukhlov. We would also like to thank Lia N. Kogarko and Felix V. Kaminsky for their constructive comments on the earlier version of this paper, Johann G. Raith for his keen editorial eye, as well as Vincent Vertolli and David Smith for arranging the museum loans.
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Chakhmouradian, A.R., Reguir, E.P. & Zaitsev, A.N. Calcite and dolomite in intrusive carbonatites. I. Textural variations. Miner Petrol 110, 333–360 (2016). https://doi.org/10.1007/s00710-015-0390-6
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DOI: https://doi.org/10.1007/s00710-015-0390-6