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Hydrothermal alteration of chevkinite-group minerals; products and mechanisms; Part 1, Hydration of chevkinite-(Ce)

B. Baginski, R. Macdonald, P. Dzierzanowski, D. Zozulya and P. M. Kartashov
Hydrothermal alteration of chevkinite-group minerals; products and mechanisms; Part 1, Hydration of chevkinite-(Ce)
Mineralogical Magazine (November 2015) 79 (5): 1019-1037

Abstract

Samples from Russia and Scotland are used to examine the interaction of the REE-Ti silicate chevkinite-(Ce) with hydrothermal fluids. Altered zones in crystals are distinguished by using areas of low intensity on backscattered-electron images, low analytical totals, increasingly large departures from stoichiometry and, in some cases, the presence of micropores. Initial alteration of the chevkinite results in strong Ca enrichment. With increasing degrees of alteration, Ca abundances drop sharply, as do those of the REE, Fe and Si. In contrast, Ti levels increase strongly, usually accompanied by higher Nb+ or -Th levels. The most altered zones contain up to 36 wt.% TiO (sub 2) and the formula cannot be expressed in the standard chevkinite formula. In detail, samples follow different alteration trends, presumably reflecting different P, T, f (sub O2) and fluid composition. The Ti enrichment may have been related to a reaction front of dissolution-reprecipitation passing through the outer zones of the original chevkinite, leaving behind a reprecipitated Ti-enriched phase which may or may not be chevkinite.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 79
Serial Issue: 5
Title: Hydrothermal alteration of chevkinite-group minerals; products and mechanisms; Part 1, Hydration of chevkinite-(Ce)
Affiliation: University of Warsaw, Institute of Geochemistry, Mineralogy and Petrology, Warsaw, Poland
Pages: 1019-1037
Published: 201511
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 48
Accession Number: 2016-007392
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N66°00'00" - N70°00'00", E32°00'00" - E42°00'00"
N54°40'00" - N61°00'00", W08°30'00" - W00°45'00"
Secondary Affiliation: Lancaster University, GBR, United KingdomRussian Academy of Sciences, RUS, Russian Federation
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201604
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