REE-bearing minerals in Drava river sediments, Slovenia, and their potential origin

Autor:	Uroš Herlec, Mihael Ravnjak, Janez Zavašnik, Aleš Šoster
Rok vydání:	2017
Předmět:	QE1-996.5 Bearing (mechanical) Geochemistry Paleontology Geology 010502 geochemistry & geophysics REE 01 natural sciences heavy minerals law.invention microanalysis Geophysics Drava law monazite Slovenija 010503 geology xenotime 0105 earth and related environmental sciences
Zdroj:	Geologija, Vol 60, Iss 2, Pp 257-266 (2017)
ISSN:	1854-620X 0016-7789
DOI:	10.5474/geologija.2017.018
Popis:	Monazite and xenotime are major ore minerals for rare earth elements (REE), Y, and actinides, a powerful tool for radiometric dating and indicators of the geological genesis of the parent rock. In this contribution, we present results of microanalysis of monazite and xenotime mineral grains found in heavy mineral sand fraction from Drava river. Investigated grains of monazite(-Ce) were found to be exhibiting varying concentrations of Th, indicating mixed hydrothermal (or greenschist-amphibolite grade) and igneous origin. Monazite was found to be isomorphically replaced by cheralite (CaTh(PO4)2) and subordinately by huttonite (ThSiO4), forming monazitecheralite and monazite-huttonite solid solution. Chemical composition and the degree of isomorphic replacement of monazite grains are indicating their source from rocks of Eclogite belt and Granatspitz massif in Tauern Window, Austria. On the other hand xenotime(-Y) shows consistent concentrations of Y while concentrations of associated heavy rare earth elements (HREE) vary, indicating the origin of mixed affiities.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d6267c729f6f145e4b01e7a4c9a796a3 https://doi.org/10.5474/geologija.2017.018 Zobrazit plný text záznamu Plný text ve formátu PDF