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Hydrothermal alteration of chevkinite-group minerals. Part 2. Metasomatite from the Keivy massif, Kola Peninsula, Russia

Published online by Cambridge University Press:  02 January 2018

R. Macdonald*
Affiliation:
Institute of Geochemistry, Mineralogy and Petrology, University ofWarsaw, al. Żwirki iWigury 93, 02–089Warsaw, Poland Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK
B. Bagiński
Affiliation:
Institute of Geochemistry, Mineralogy and Petrology, University ofWarsaw, al. Żwirki iWigury 93, 02–089Warsaw, Poland
P. M. Kartashov
Affiliation:
Institute of Ore Deposits, Russian Academy of Sciences, Moscow 119107, Russia
D. Zozulya
Affiliation:
Geological Institute, Kola Science Centre, Russian Academy of Sciences, Apatity, Russia
P. Dzierżnowski
Affiliation:
Institute of Geochemistry, Mineralogy and Petrology, University ofWarsaw, al. Żwirki iWigury 93, 02–089Warsaw, Poland

Abstract

Chevkinite-(Ce) in a mineralized quartz-epidote metasomatite from the Keivy massif, Kola Peninsula, Russia, underwent at least two stages of low-temperature alteration. In the first, it interacted with hydrothermal fluids, with loss of Ca, Fe, LREE and Si and strong enrichment in Ti. The altered chevkinite was then rimmed and partially replaced by a zone of ferriallanite-(Ce) and davidite-(La), in turn rimmed by a zone of allanite-(Ce) richer in the epidote component. The allanite zone was in turn partially replaced by rutile-titanite-quartz assemblages, the formation of titanite postdating that of rutile. Aeschynite-(Y), aeschynite-(Ce) and REE-carbonates are accessory phases in all zones. The hydrothermal fluids were alkaline, with significant proportions of CO2 and F. At various alteration stages, the Ca, Si ± Al activities in the fluid were high. Formation of the aeschynite is discussed in relation to its stability in broadly similar parageneses; it was a primary phase in the unaltered chevkinite zone whereas in other zones it formed from Nb, Ti, REE and Th released from the major phases.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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