 | Gonçalves, , Melgarejo, , Alfonso, , Amores, , Paniagua, , Neto, , Morais, , Camprubí, (2019) The Distribution of Rare Metals in the LCT Pegmatites from the Giraúl Field, Angola. Minerals, 9 (10) 580 doi:10.3390/min9100580 | Journal (article/letter/editorial) | | Distribution of Rare Metals in the LCT Pegmatites from the Giraúl Field, Angola Antonio Olimpio Gonçalves 1 ,...de Fevreiro 71, Caixa Postal 815, Luanda 2131, Angola; tonygoncalves72@hotmail.com (A.O.G.); anbuneto@hotmail...Abstract: The Giraúl granitic pegmatite field in Angola is composed of five pegmatite types, the most evolved...beryl-columbite-phosphate and spodumene types. Pegmatites are concentrically zoned with increased grain...the most evolved pegmatites have well-developed replacement units. These pegmatites are rich in Nb-Ta |  | Alfonso, P., Melgarejo, J. C., Yusta, I., Velasco, F. (2003) GEOCHEMISTRY OF FELDSPARS AND MUSCOVITE IN GRANITIC PEGMATITE FROM THE CAP DE CREUS FIELD, CATALONIA, SPAIN. The Canadian Mineralogist, 41 (1) 103-116 doi:10.2113/gscanmin.41.1.103 | Journal (article/letter/editorial) | | FELDSPARS AND MUSCOVITE IN GRANITIC PEGMATITE FROM THE CAP DE CREUS FIELD, CATALONIA, SPAIN PURA ALFONSO§...Creus pegmatite field exhibits a well-defined regional zonation of four types of granitic pegmatite: barren...barren Kfeldspar-rich pegmatites (type I), beryl–columbite-subtype pegmatites (type II), beryl–columbite–phosphate-subtype...pe pegmatites (type III) and albite-type pegmatites (type IV). There is an increase in the albite content...increasing pegmatite evolution. Type-I microcline-rich pegmatites have low contents of albite, whereas |  | | Journal (article/letter/editorial) | | Austria Nb-Ta-Minerals from the Cap de Creus pegmatite field, eastern Pyrenees: distribution and geochemical...mineralogy facilitate distinction of four main pegmatite types at the eastern end of the Pyrenees. Three...Nb) ratio increasing towards the more evolved pegmatites, Mn/(Mn + Fe) being relatively low and increasing...trend, with similar enrichment toward the late pegmatite units; a single-crystal trend, with zoning related...expected for a beryl-columbite pegmatite type. In a single pegmatite, the evolution depends on the simultaneous |  | | Journal (article/letter/editorial) | | FLUID EVOLUTION IN THE ZONED RARE-ELEMENT PEGMATITE FIELD AT CAP DE CREUS, CATALONIA, SPAIN Pura ALFONSO§...Spain Abstract The Cap de Creus LCT granitic pegmatites, in Catalonia, northeastern Spain, belong to...and to the albite type. Fluid inclusions have been studied in all these types of pegmatite to determine...columbite pegmatites are zoned; border, wall, intermediate zones and a quartz core and albite-dominant...phosphate pegmatites, in addition, feature veins of albite and quartz–muscovite. In the albite pegmatites |  | Mall�, A., Fontan, F., Melgarejo, J. C., Mata, J. M. (1995) The Albera zoned pegmatite field, Eastern Pyrenees, France. Mineralogy and Petrology, 55 (1) 103-116 doi:10.1007/bf01162582 | Journal (article/letter/editorial) | | 1995 Printed in Austria The Albera zoned pegmatite field, Eastern Pyrenees, France A. Mall61, F. Fontan...of pegmatites comprise the zoned pegmatite feld in the eastern sector of the Albera Massif. Type I is...is represented by barren pegmatites with graphic textures; type II comprises transitional varieties with...scarce N b - T a and U oxide minerals; type III consists of pegmatites with significant zones of replacement...b - T a oxide minerals; and type IV, muscovite-quartz-albite pegmatites are highly mineralized with Be |  | Van Lichtervelde, Marieke, Grand’Homme, Alexis, de Saint-Blanquat, Michel, Olivier, Philippe, Gerdes, Axel, Paquette, Jean-Louis, Melgarejo, Joan Carles, Druguet, Elena, Alfonso, Pura (2017) U-Pb geochronology on zircon and columbite-group minerals of the Cap de Creus pegmatites, NE Spain. Mineralogy and Petrology, 111 (1) 1-21 doi:10.1007/s00710-016-0455-1 | Journal (article/letter/editorial) | | columbite-group minerals of the Cap de Creus pegmatites, NE Spain Marieke Van Lichtervelde 1 & Alexis...Wien 2016 Abstract The Cap de Creus granitic pegmatites in the eastern Catalan Pyrenees were dated using...types of pegmatites from type I (K-feldspar pegmatites, least evolved) to type IV (albite pegmatites, most...dating the different pegmatitic pulses. In a type III pegmatite where zircon and CGM are co-genetically associated...Two ages were obtained for type I and three ages for type III pegmatites. Three of these 5 ages range |  | | Journal (article/letter/editorial) | | TYPES OF PEGMATITES IN THE ARCHEAN AT GRAND CANYON, ARIZONA reN caupaou', cal'i'forniaInstitute oJ Technorogy...Technorogy, pasadena,catiforni,a. Assrnacr Granite pegmatites are abundantly developed in the Archean terrane...abundant is similar to the common quartz-microcrine pegmatites and is definitely intrusive into a series of...of meta-sediments and metabasites. A second type has deveroped by replacement, "pegmatization," processes...of what are regarded as Type I pegmatites may really be of Type II or Type III. fxrnooucuoN AND AcrNowr |  | | Journal (article/letter/editorial) | | The genesis of LCT-type granitic pegmatites, as illustrated by lithium isotopes in micas... Villaros, Arnaud, The genesis of LCT-type granitic pegmatites, as illustrated by lithium isotopes in... ACCEPTED MANUSCRIPT The genesis of LCT-type granitic pegmatites, as illustrated by lithium isotopes in...Isotopic compositions in the Monts d’Ambazac Pegmatite Field (French Massif Central) RI P T exhibit a...of each pegmatite type: from 630 ppm in Type II up to 13,500 ppm in the more evolved NU Type VI pegmatite |  | Hatert, Frédéric, Galliski, Miguel, Roda-Robles, Encarnación, Vignola, Pietro, Fransolet, André-Mathieu (2016) Crystal Chemistry of the Wyllieite Group of Phosphate Minerals. The Canadian Mineralogist, 54 (4) 1087-1101 doi:10.3749/canmin.1600033 | Journal (article/letter/editorial) | | wyllieite from the Buranga pegmatite, Rwanda (A); wyllieite from the Malpensata pegmatite, Italy (B); and qingheiite...qingheiite from the Santa Ana pegmatite, Argentina (C). Their crystal structures were refined, based on...minerals are compared to those of other wyllieite-type phosphates: ferrorosemaryite, rosemaryite, and qingheiite-(Fe2þ)...phosphates which occur in rare-element granitic pegmatites, particularly in the beryl-columbitephosphate...to P21/n. The structural formula of the wyllieite-type phosphate minerals then becomes X(2)X(1a)0.5X(1b)0 |
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