The stability of xenotime in high Ca and Ca-Na systems, under experimental conditions of 250–350°C and 200–400 MPa : the implications for fluid-mediated low-temperature processes in granitic rocks

• Autorzy: Budzyń B. , Kozub-Budzyń G. A.

Identyfikatory

DOI

10.7306/gq.1223

• Języki publikacji: EN

Abstrakty

EN

he stability of xenotime was tested by experiments in the presence of a silicate mineral assemblage and two different fluids, 2M Ca(OH)₂ or Na₂Si₂O₅ + H₂O, under P-T conditions of 200-400 MPa and 250-350°C. The xenotime was stable in runs with 2M Ca(OH)₂, replicating the low-temperature metasomatic alterations of granitic rocks, except in experiment at 350°C and 400 MPa, where some (Y,REE)-rich fluorapatite formed. Experiments with Na₂Si₂O₅ + H₂O resulted in significant xenotime alteration and partial replacement by an unknown (Y,HREE)-rich silicate, and in the formation of minor amounts of (Y,REE)-rich fluorapatite. The latter indicate preferential partitioning of Y and REE into silicates over phosphates during low-temperature, metasomatic processes in a high Na-Ca system, similar to peralkaline granitic rocks.

Słowa kluczowe

EN

xenotime; yttrium fluorapatite; yttrium silicate; rare earth elements (REE); experimental petrology

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2015
• Tom: Vol. 59, No. 2
• Strony: 316–324
• Opis fizyczny: Bibliogr. 31 poz., rys., tab.

Twórcy

autor

Budzyń B.

• Polish Academy of Sciences, Institute of Geological Sciences, Research Centre in Kraków, Senacka 1, 31-002 Kraków, Poland
• Jagiellonian University, Institute of Geological Sciences, Oleandry 2a, 30-063 Kraków, Poland

autor

Kozub-Budzyń G. A.

• AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, al. A. Mickiewicza 30, 30-059 Kraków, Poland

Bibliografia

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