Occurrence of Th, U, Y, Zr, and REE-bearing accessory minerals in late-Variscan granitic rocks from the Sierra de Guadarrama (Spain)

R. Casillas, G. Nagy, G. Panto, J. Brandle, I. Forizs

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

The paragenesis of Y, Th, U, Zr and REE accessory minerals in four different late-Variscan granitic associations of the Sierra de Guadarrama are discussed. Characteristics accessory mineralogical paragenetic sequences are found in each association. The occurrence of different minerals is controlled by the initial trace-element contents of the melt, the aluminous index, the Ca content and volatiles, as well as (F, P) contents, fO2 and the LREE/HREE, Th/REE, and U/Th ratios of the melts. The accessory mineral assemblages can be changed by post-magmatic hydrothermal processes. The differences between the accessory mineralogical paragenesis and the individual mineral compositions in the granite rocks are discussed using these parameters, which play a key role in determining the crystallization of accessory REE, Th and U-bearing phases in the studied granitoids. -from Authors

Original languageEnglish
Pages (from-to)989-1006
Number of pages18
JournalEuropean Journal of Mineralogy
Volume7
Issue number4
DOIs
Publication statusPublished - Jan 1 1995

ASJC Scopus subject areas

  • Geochemistry and Petrology

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