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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.date.accessioned2018-07-25T10:58:32Z
dc.date.available2018-07-25T10:58:32Z
dc.date.issued2000-01
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.identifier.issn1210-8197
dc.identifier.urihttp://hdl.handle.net/2117/119960
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.language.isoeng
dc.subjectÀrees temàtiques de la UPC::Enginyeria civil::Geologia::Mineralogia
dc.subject.lcshPegmatites--Spain--Catalonia
dc.subject.otherTourmaline
dc.subject.otherElectron microprobe
dc.subject.otherPhosphorus
dc.subject.otherBoron
dc.subject.otherGranitic pegmatite
dc.titleBoron vs. phosphorus in granitic pegmatites: the Cap de Creus case (Catalonia, Spain)
dc.typeArticle
dc.subject.lemacPegmatites--Catalunya
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttp://www.jgeosci.org/content/JCGS.806_Alfonso.pdf
dc.rights.accessOpen Access
local.identifier.drac776939
dc.description.versionPostprint (published version)
local.citation.authorAlfonso, P.; Melgarejo, J.C.
local.citation.publicationNameJournal of the Czech Geological Society
local.citation.volume45
local.citation.number1-2
local.citation.startingPage131
local.citation.endingPage141


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