Show simple item record

dc.contributor.authorAlfonso Abella, María Pura
dc.contributor.authorMelgarejo Draper, Joan Carles
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Minera, Industrial i TIC
dc.coverage.spatialeast=3.314970799999969; north=42.32024509999999; name=17488 Cadaqués, Girona, Espanya
dc.identifier.citationAlfonso, P., Melgarejo, J.C. Boron vs. phosphorus in granitic pegmatites: the Cap de Creus case (Catalonia, Spain). "Journal of the Czech Geological Society", Gener 2000, vol. 45, núm. 1-2, p. 131-141.
dc.description.abstractThe Cap de Creus pegmatite field exhibits a well-defined regional zonation of four types of granitic pegmatite: barren K-feldspar-rich pegmatites (type I), beryl-columbite-subtype pegmatites (type II), beryl-columbite-phosphate-subtype pegmatites (type III) and albite-type pegmatites (type IV). There is an increase in the albite content, relative to K-feldspar, with increasing pegmatite evolution. Type-I microcline-rich pegmatites have low contents of albite, whereas in type IV, albite is the only feldspar. The K/Rb value in K-feldspar decreases progressively from type-I to type-III pegmatites. In addition, there is a progressive enrichment in P, Rb, Cs, Y, Sr, Ga, Ce, W and Sn from type-I to type-IV pegmatites. Concentrations of Pb and Zr decrease in K-feldspar from type-I to type-III pegmatites. K-feldspar from the Cap de Creus pegmatites exhibits higher contents in Ba, Rb, Cs, Nb, Y, Sn, V and Cr than albite. Albite is richer in Sr, Zr, Cu, As, Ce and Ga, Pb, Zn, W, Co and Ni have similar affinity for K-feldspar and albite. Muscovite exhibits similar geochemical evolution to K-feldspar. These progressive trends suggest a common origin for all of the Cap de Creus pegmatites by fractionation of the same parental magma. The high P content of feldspars, up to 1.67 wt.% P 2O 5 in K-feldspar and 1.75 wt.% in albite, indicates buildup in this element from the earliest stages of pegmatite crystallization. Trace-element variation in feldspars and muscovite reflects enrichments in the melt; a higher content correlates with characteristic minerals of these elements. In particular, the phosphorus content of albite is proposed as a useful mineralogical guide to niobium-tantalum-rich oxide mineralization.
dc.format.extent11 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria civil::Geologia::Mineralogia
dc.subject.otherElectron microprobe
dc.subject.otherGranitic pegmatite
dc.titleBoron vs. phosphorus in granitic pegmatites: the Cap de Creus case (Catalonia, Spain)
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
local.citation.authorAlfonso, P.; Melgarejo, J.C.
local.citation.publicationNameJournal of the Czech Geological Society

Files in this item


This item appears in the following Collection(s)

Show simple item record

All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder