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Minerals, Volume 10, Issue 5

May 2020 - 99 articles

Cover Story: Allanite is a common accessory mineral in the intermediate dykes intruding the granitoid pluton of Karkonosze (SE Poland) and shows prominent traces of hydrothermal mineral-fluid interaction. The fluids infiltrated the magmatic cores of allanite crystals, forming a worm-shaped interaction zone (upper image). The most significant chemical changes include enrichment in Th, alkalis, Y and HREE, as well as depletion in Ca, Mg and LREE (lower images). One of the main alteration products are REE-fluorocarbonates. The composition of the altered allanite, as well as secondary minerals, points to participation of alkaline, low-temperature, possibly oxidized, F-Cl-bearing fluids. View this paper
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Minerals - ISSN 2075-163X