Metamict fergusonite from Kolonna and Masimbula, Sri Lanka

Autor(en): Annalena Erlacher, Manuela Zeug, Radek Skoda, K. A. Geeth Sameera, Lutz Nasdala
Abstrakt: Two radioactive mineral specimens (with compositions Th0₂ 2.9-4.6 wt% and U0₂ 5.8-7.8 wt%, respectively), collected from a placer deposit near Kolonna and a quarry near Masimbula, Sri Lank.a, were identified as metamict fergusonite. Identification was based on samples' chemical compositions and the observation that both specimens were transformed to crystalline fergusonite upon dry annealing at 550-600 °C, including the spectroscopic observation of a high-temperature α → β transition (≥750 °C) that is characteristic of this mineral. Strong negative Eu anomalies in chondrite-normalised REE patterns indicate reducing formation conditions. Both samples have experienced (perhaps even multiple) chemical alteration processes that led to the formation of decidedly
heterogeneous internal textures. Fluid-driven alteration, especially along fractures and domain boundaries, has resulted in vast chemical changes.
Organisation(en): Institut für Mineralogie und Kristallographie
Externe Organisation(en): Universität Wien, University of Peradeniya, Geological Survey and Mines Bureau, Masaryk University
Journal: Journal of the Geological Society of Sri Lanka
Band: 22-2
Seiten: 1-14
Anzahl der Seiten: 14
ISSN: 2719-2326
DOI: https://doi.org/10.4038/jgssl.v22i2.67
Publikationsdatum: 12-2021
Peer-reviewed: Ja
ÖFOS 2012: 105116 Mineralogie, 104026 Spektroskopie
Schlagwörter
Link zum Portal: https://ucrisportal.univie.ac.at/de/publications/c1801236-657e-4cae-b8ce-71404b804f39

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