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Fluorapatite-hingganite-(Y) coronas as products of fluid-induced xenotime-(Y) breakdown in the Skoddefjellet pegmatite, Svalbard

Published online by Cambridge University Press:  05 July 2018

J. Majka*
Affiliation:
Uppsala University, Department of Earth Sciences, Villavägen16, SE-752 36 Uppsala, Sweden
J. Pršek
Affiliation:
AGH – University of Science and Technology, Faculty of Geology, Geophysics and Environment Protection, al. Mickiewicza 30, 30-059 Kraków, Poland
B. Budzyń
Affiliation:
Polish Academy of Sciences, Institute of Geological Sciences, Kraków Research Centre, Senacka 1, 31-002 Kraków, Poland
P. Bačík
Affiliation:
Comenius University, Faculty of Natural Sciences, Department of Mineralogy and Petrology, Mlynská dolina, 842 15 Bratislava, Slovakia
A. K. Barker
Affiliation:
Uppsala University, Department of Earth Sciences, Villavägen16, SE-752 36 Uppsala, Sweden
M. Łodziński
Affiliation:
AGH – University of Science and Technology, Faculty of Geology, Geophysics and Environment Protection, al. Mickiewicza 30, 30-059 Kraków, Poland

Abstract

The pre-Caledonian NYF Skoddefjellet pegmatite in Wedel Jarlsberg Land, Svalbard, contains xenotime-(Y) that is partly replaced by fluorapatite-hingganite-(Y) reaction coronas. Hingganite-(Y) contains up to 2.0 wt.% of Gd2O3, 4.7 wt.% of Dy2O3, 3.3 wt.% of Er2O3 and 5.5 wt.% of Yb2O3. Such unusual, previously undescribed, xenotime-(Y) breakdown was caused by Ca- and F-bearing fluids interacting with the pegmatite. The occurrence of hinnganite-(Y) as a breakdown product of xenotime-(Y) implies that a Be-bearing phase (beryl in this case) was also involved in the reaction. There are few Ca-bearing primary phases in the pegmatite, indicating that the source of fluid was probably located in the generally Ca-richer host rocks (metasediments), though the fluid composition was modified during metasomatism of the pegmatite (i.e. beryl dissolution).

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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