The Albera zoned pegmatite field, Eastern Pyrenees, France

Malló, A.; Fontan, François; Melgarejo, Joan-Carles; Mata, Jorge García

doi:10.1007/bf01162582

Cited by 17 publications

(10 citation statements)

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“…Moreover, in the Albera pegmatite field, 50 km to the northwest of Cap de Creus, similar types of pegmatite are zonally arranged around a leucogranite intrusion (Malló et al 1995).…”

Section: Four Types Of Pegmatitementioning

confidence: 99%

Geochemistry of Feldspars and Muscovite in Granitic Pegmatite From the Cap De Creus Field, Catalonia, Spain

Alfonso

Melgarejo

Yusta

et al. 2003

The Canadian Mineralogist

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The Cap de 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 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 Kfeldspar 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 Kfeldspar 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 2 O 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. SOMMAIRE La suite de pegmatites granitiques du Cap de Creus démontre bien une zonation régionale dans la disbtribution de quatre types de pegmatite: pegmatites stériles enrichies en feldspath potassique (type I), pegmatites du sous-type à béryl-columbite (type II), pegmatites du sous-type à béryl -columbite -phosphate (type III), et pegmatites à albite (type IV). Il y a une augmentation progressive de la teneur en albite par rapport à celle du feldspath potassique, avec le degré de fractionnement. Les pegmatites du type I, riches en microcline, ont une faible teneur en albite, tandis que dans les pegmatites de type IV, l'albite est le seul feldspath. La valeur de K/Rb du feldspath potassique diminue progressivement des pegmatites du type I à celles du type III. De plus, il y a un enrichissement progressif en P, Rb, Cs, Y, Sr, Ga, Ce, W et Sn du type I au type IV. Les concentrations de Pb et Zr diminuent dans le feldspath potassique des pegmatites du type I à celles du type III. Le feldspath potassique des pegmatites du Cap de Creus fait preuve de teneurs plus élevées en Ba, Rb, Cs, Nb, Y, Sn, V et Cr que l'albite. En revanche, l'albite est plus riche en Sr, Zr, Cu, As, Ce et Ga. Le Pb, Zn, W, Co et Ni ont un degré d'enrichissement semblable dans le feldspath potassique et l'albite. La muscovite fait preuve d'enrichissements ...

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“…Moreover, in the Albera pegmatite field, 50 km to the northwest of Cap de Creus, similar types of pegmatite are zonally arranged around a leucogranite intrusion (Malló et al 1995).…”

Section: Four Types Of Pegmatitementioning

confidence: 99%

Geochemistry of Feldspars and Muscovite in Granitic Pegmatite From the Cap De Creus Field, Catalonia, Spain

Alfonso

Melgarejo

Yusta

et al. 2003

The Canadian Mineralogist

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“…In this instance, the parental pluton is not exposed, but the pattern of fractionation, as seen in the accessory minerals, and the progressive buildup of primary phosphates, most prominent in the third generation (Alfonso & Melgarejo 2000), favors the existence of an unseen fractionating system "below". Furthermore, the Cap de Creus suite is considered coeval with the Albera suite located on the French side of the border, where the parental pluton has been recognized (Malló et al 1995). Thus caution definitely is needed before jumping to the conclusion that there is no parental pluton in one's study area, and that fractionation of crystals from a parental magma is not the main petrogenetic process at work.…”

Section: Pegmatites Formed By Fractionation Of a Precursor Magmamentioning

confidence: 99%

The Patterns of Enrichment in Felsic Pegmatites Ultimately Depend on Tectonic Setting

Martin¹,

Vito²

2005

The Canadian Mineralogist

168

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The classification scheme of granitic pegmatites currently in vogue is largely an offshoot of the depth-zone classification of granitic rocks. We propose instead a focus on petrogenetic processes at work, and extend it to pegmatites in silica-saturated and-undersaturated systems. Small-scale bodies of pegmatites are encountered in metamorphic systems undergoing anatexis, as temperature is rising regionally. We include a newly recognized category of corundum-bearing anatectic felsic pegmatite formed in mantle peridotite earlier subjected to a metasomatic overprint by a mixed H 2 O + CO 2 fluid. The bulk of the pegmatite bodies encountered are not obviously of anatectic origin, but are derived by fractionation of pluton-size batches of felsic magma. We consider LCT (Li-Cs-Ta-enriched) pegmatites to be members of orogenic (calc-alkaline suites) formed in a subduction setting; in contrast, NYF (Nb-Y-F-enriched) pegmatites, are affiliated with anorogenic suites, formed in an extensional setting, and really not fundamentally different in petrogenetic lineage from suites in silica-undersaturated systems, including carbonatites. Both LCT and NYF types involve magmas containing crust and mantle components, but in the case of anorogenic magmatism, a metasomatic ground-preparation by a mantle-derived H 2 O + CO 2 fluid phase precedes large-scale melting, to assure a product having alkaline tendencies. A primary NYF-LCT signature may occur in shoshonitic suites. Finally, we discuss hybrid pegmatites in which an NYF pegmatitic system takes on a LCT-like overprint owing to contamination from local sources. The possibility of an LCT pegmatite also being affected by an LCT-type overprint, to form a "super-LCT pegmatite" is explored briefly. Proper documentation of the petrogenetic processes at work is essential in assessing the economic potential of pegmatite occurrences.

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“…Several hundred pegmatite dykes occur concentrically and zonally around muscovite-biotite granite stocks, close to their boundaries with the Precambrian orthogneisses and the Paleozoic series, therefore Autran et al (1970) suggested an anatectic origin for the pegmatites as well. However, Malló et al (1995) argue for an origin by magmatic fractionation of the Albera pegmatites based on the geochemical trends of the accessory minerals (phosphates and Nb-Ta-oxides). Malló et al (1995) specify that the pegmatite source would be the anatectic muscovite-biotite leucogranites.…”

Section: The Anatectic Vs Granitic Origin Of Pegmatitesmentioning

confidence: 99%

“…However, Malló et al (1995) argue for an origin by magmatic fractionation of the Albera pegmatites based on the geochemical trends of the accessory minerals (phosphates and Nb-Ta-oxides). Malló et al (1995) specify that the pegmatite source would be the anatectic muscovite-biotite leucogranites. The pegmatites in the Albera massif and in the Cap de Creus peninsula are comparable in their structure, mineralogy, geochemistry and regional distribution, which suggests a common origin.…”

Section: The Anatectic Vs Granitic Origin Of Pegmatitesmentioning

confidence: 99%

“…Malló et al (1995) specify that the pegmatite source would be the anatectic muscovite-biotite leucogranites. The pegmatites in the Albera massif and in the Cap de Creus peninsula are comparable in their structure, mineralogy, geochemistry and regional distribution, which suggests a common origin.…”

Section: Implications For the Geochronology Of Late Variscan Tectonicsmentioning

confidence: 99%

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U-Pb geochronology on zircon and columbite-group minerals of the Cap de Creus pegmatites, NE Spain

et al. 2016

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Aquesta és una còpia de la versió author's accepted manuscrit d'un article publicat a la revista Mineralogy and petrology Abstract The Cap de Creus granitic pegmatites in the eastern Catalan Pyrenees were dated using in situ U-Pb geochronology by laser ablation ICP-MS on zircon and columbite-group minerals (CGM), which are present in the different types of pegmatites from type I (K-feldspar pegmatites, least evolved) to type IV (albite pegmatites, most evolved) and therefore allow dating the different ManuscriptClick here to download Manuscript publication_text_v9. doc 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2 pegmatitic pulses. In a type III pegmatite where zircon and CGM are co-genetically associated in the same sample, both minerals were dated using zircon and tantalite reference materials, respectively, to avoid laser-induced matrix-dependent fractionation. In one sample, xenotime genetically associated with zircon was also dated. Two ages were obtained for type I and three ages for type III pegmatites. Three of these 5 ages range from 296.2 ± 2.5 to 301.9 ± 3.8 Ma and are allocated to the primary magmatic stage of crystallization and therefore to the emplacement event.Two younger ages (290.5 ± 2.5 and 292.9 ± 2.9 Ma) obtained on secondary zircon and xenotime, respectively, are interpreted as late post-solidus hydrothermal remobilization. There is no age difference between type I and type III pegmatites. The mean 299 Ma primary magmatic age allows the main late Carboniferous deformation event to be dated and is also synchronous with other peraluminous and calc-alkaline granites in the Pyrenees. However, the youngest ages around 292Ma imply that tectonics was still active in Early Permian times in the Cap de Creus area. IntroductionThe Cap de Creus peninsula (NE Spain) in the easternmost end of the Pyrenean Axial Zone is a remarkable center of interest for geologists because of its well-exposed outcrops that reveal a complex tectonic, metamorphic and magmatic history. Several episodes of deformation and regional metamorphism are accompanied by calc-alkaline and peraluminous magmatism and affected a late Proterozoic series of metasediments and metavolcanics during the Variscan orogeny. An important group of mineralized granitic pegmatites is associated with these tectonic events.The study of granitic pegmatites in Europe is gaining interest because these highly fractionated rocks are important sources of industrial minerals and strategic metals such as Li and the high field strength elements Nb-Ta and Sn (Linnen et al. 2012). In Europe rare-element granitic 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 ...

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The Albera zoned pegmatite field, Eastern Pyrenees, France

Cited by 17 publications

References 4 publications

Geochemistry of Feldspars and Muscovite in Granitic Pegmatite From the Cap De Creus Field, Catalonia, Spain

Geochemistry of Feldspars and Muscovite in Granitic Pegmatite From the Cap De Creus Field, Catalonia, Spain

The Patterns of Enrichment in Felsic Pegmatites Ultimately Depend on Tectonic Setting

U-Pb geochronology on zircon and columbite-group minerals of the Cap de Creus pegmatites, NE Spain

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