 | 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...belong to the beryl-columbite, beryl-columbite-phosphate and spodumene types. Pegmatites are concentrically...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...Kfeldspar-rich pegmatites (type I), beryl–columbite-subtype pegmatites (type II), beryl–columbite–phosphate-subtype...beryl–columbite–phosphate-subtype pegmatites (type III) and albite-type pegmatites (type IV). There is an increase in the...K-feldspar, with increasing pegmatite evolution. Type-I microcline-rich pegmatites have low contents of albite |  | | 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...are those expected for a beryl-columbite pegmatite type. In a single pegmatite, the evolution depends on |  | 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...F e - M n phosphates, beryl and more abundant N b - T a oxide minerals; and type IV, muscovite-quartz-albite |  | | Journal (article/letter/editorial) | | FLUID EVOLUTION IN THE ZONED RARE-ELEMENT PEGMATITE FIELD AT CAP DE CREUS, CATALONIA, SPAIN Pura ALFONSO§...granitic pegmatites, in Catalonia, northeastern Spain, belong to the beryl – columbite and beryl – columbite...to the albite type. Fluid inclusions have been studied in all these types of pegmatite to determine the...fluids involved in their formation. Beryl – columbite pegmatites are zoned; border, wall, intermediate...replacement bodies are distinguished. Beryl – columbite – phosphate pegmatites, in addition, feature veins of |  | | Journal (article/letter/editorial) | | veins within ultrabasic rocks. At the same time, pegmatite-free emerald deposits linked to ductile shear...ultra basic rocks and also a desilication of the pegmatites. A new classification based on the geological... Schist-beryl-type deposits, which resulted from the chemical interaction between pegmatites and basic-ultrabasic...classic type except for the Santa Terezinha de Goias and Itaberai prospects (Fig. 1), where pegmatite veins...veins are absent. The pegmatites are directly linked to intrusive granitic bodies with limited local extension |  | | Journal (article/letter/editorial) | | SOCIETY OF AMERICA JANUARY, 1935 No. I THE PEGMATITES OF FITCHBURG, MASSACHUSETTS C. SraNrrnro HrrcnnN...New England. The pegmatite bodies themselves are of an interesting and peculiar type and consistof a number...granite-so common in many of the New England pegmatites-is here entirely absent,and there is also little...of the principal tourmaline type pegmatites at Fitchburg. The pegmatites occur within the granite, sometimes...enclosing rock and never contain cavities. fn general, field observations tend to show that the larger members |  | | Journal (article/letter/editorial) | | 49, PP. 733-8 Genesis of chrysoberyl in the pegmatites of southern Kerala, India K. SOMAN AND N. G....Kerala, India, chrysoberyl occurs in granitic pegmatites in association with quartz in alkali feldspar...thought to crystallize earlier than beryl and sillimanite. The pegmatites are thought to have derived from...chrysoberyl, pegmatites, Kerala, India. CHRYSOBERYL is rather rare in granitic pegmatites, though known...and Beus (1960) have postulated that granitic pegmatites with obvious aluminium contamination may contain |  | 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) | | 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 |
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