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Fluorapatite-hingganite-(Y) coronas as products of fluid-induced xenotime-(Y) breakdown in the Skoddefjellet pegmatite, Svalbard
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
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2011 (English)In: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 75, no 1, 159-167 p.Article in journal (Refereed) Published
Abstract [en]

The pre-Caledonian NYF Skoddefjellet pegmatite in Wedel Jarlsberg Land, Svalbard, contains xenotime-(Y) that is partly replaced by fluorapatite-hingganite-(Y) reaction coronas. Hingganitc-(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).

Place, publisher, year, edition, pages
2011. Vol. 75, no 1, 159-167 p.
Keyword [en]
xenotime, hingganite, apatite, pegmatite, Svalbard, Caledonides
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-154536DOI: 10.1180/minmag.2011.075.1.159ISI: 000290608600009OAI: oai:DiVA.org:uu-154536DiVA: diva2:421007
Available from: 2011-06-07 Created: 2011-06-07 Last updated: 2012-12-17Bibliographically approved

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Majka, JaroslawBarker, Abigail
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