 | Ballèvre, M., Fourcade, S., Capdevila, R., Peucat, J.-J., Cocherie, A., Fanning, C. Mark (2012) Geochronology and geochemistry of Ordovician felsic volcanism in the Southern Armorican Massif (Variscan belt, France): Implications for the breakup of Gondwana. Gondwana Research, 21 (4) 1019-1036 doi:10.1016/j.gr.2011.07.030 | Journal (article/letter/editorial) | | Variscan belt Porphyroid Nappe Ollo de Sapo Ordovician Zircon geochronology a b s t r a c t Low-grade, porphyritic...(Para-autochthon), and because of a previous zircon age. Five new U–Pb SHRIMP zircon dates for the felsic volcanics...amounts of carbonates and rare broken apatite and zircon grains. Magmatic quartz is found as colorless or...few quarries inland (Bréthomé, Vairé). These rocks do not display a foliation, are devoid of veins, and...with Iberia. 3. U–Pb zircon geochronology 3.1. Analytical techniques U–Pb zircon analyses were performed |  | | Report (chapter) | | an unmetamorphosed alkaline granite pluton (Alter Pedroso) dated at 490 --- 10 Ma by the U-Pb method (Allegret...Precambrian rocks of the Southwestern Iberian Massif do not allow the precise definition of the ages of the...geolrgico del sector central del anticlinorio Portalegre-Badajoz-Cordoba (Macizo Ibdrico Meridional)....Ossa-Morena). ComunicacOes Servicos Geol6gicos de Portugal, 69, (2), 219-226. EGUILUZ, L. 1987. Petrogdnesis...D., NAGLER, Th. F. & QUADT, A. VON. 1988. U-Pb zircon and Sm-Nd studies of various rock-types of the |  | | Journal (article/letter/editorial) | | rhyolites from the Macedo de Cavaleiros region (NE Portugal) By M. LuIsA RIBEIRO, Lisboa*) With 13 figures...geochemistry of Variscan peralkaline gneisses from NE Portugal, discovered in 1962, is presented. Major and trace...Serviqos Geol6gicos de Portugal, R. Academia Ci~ncias, 19, 1200 Lisboa, Portugal. which they are overlain...des gneiss varisques peralcalins du nord-est du Portugal, d~couverts en 1962. Les analyses des 616ments...and HLAWASTSCH(1906) in the Cevadais area (SE Portugal). Meanwhile, many other articles have been published |  | | Journal (article/letter/editorial) | | from bottom to top: basal orthogneiss of Miranda do Douro is overlain by a complex of schist and greywacke...during Variscan times. The emplacement of the Miranda do Douro and Viana del Bollo orthogneisses have been...were redeposited as pyroturbidites [9,21]. --Miranda do Douro orthogneiss [22], is equivalent to certain...have also been interpreted, in the area of "Miranda do Douro", to be the plutonic equivalent of the volcanics...de Sapo anticlinorium [4,10,25] and in the Miranda do Douro antiform [21,22]. A B iii!i I T - - " PCE |  | | Journal (article/letter/editorial) | | the type osannite from pegmatites from Alter Pedroso, Portugal, named by HLAWATSCH (1906) for its distinctive...of composition. The clearly merit more study, as do the members of the magnesioriebeckite-crossite-ferroglaucophane...g . 1 w h i c h do n o t fall e x a c t l y o n t h e d i a g o n a l s w o u l d do so if t h e a n...respectively. I t is likely that fl and y indices do in fact intersect within the diagram (Fig. 4) and...HLAWATSCg, C.: ~ b e r den Amphibol yon Cervadaes, Portugal. Festschrift ffir H. ROSEN~ s c ~ , Stuttgart |  | | Journal (article/letter/editorial) | | feldspathfreies Endglied der Alkalireihe von Alter Pedroso," Sitzb. Heidelberger Akad. Wiss., Math.-naturw...occurring in a light-colored alkali-syenite in Portugal. The rock consists entirely of amphibole (osannite)...silica; unsaturated, or unsated, are those which do not appear in association with free silica. Among...topaz, titanite, magnetite, ilmenite, apatite, zircon; among the latter, leucite, nephelite, sodalite |  | | Journal (volume) | | position an a log u e ace 11 e deR co nglomerats do Suursaari-Hogland 2 ,3 , 4. car Ra (;omposition a...Süll~kHJlel i Finland. 21 vom paläozoischem Alter cler Schiefer- und Grünsteinformationen der Petsamontunturit...werden. Die tektonisch wichtige Frage nach elen Alter;.;vcrhältnissen ...an altitude of ab out 230 m, but real eRker ridges do not oeeur. At the bottom of the valley whieh Reparatc...ice. Another notable fact is that erosion valleys do not occur in the esker gravel field :,urrounding |  | | Journal (article/letter/editorial) | | uralite, and chlorite. Apatite, sphene, rutile, zircon, and various metallic minerals are accessories...ultramafics nor amphibolites cover so large an area as they do in the Krivaja-Konjuh massif. Finally, ultramafics...may be transformed into leucoxene. Apatite and zircon are most frequent transparent accessories. P2O6...in extremely rare cases it may reach 1 per cent. Zircon is usually more common in garnet-containing amphibolites...Amphibolen. I. Mitteilung: Die Osannite von Alter Pedroso. Schweiz. Miner. Petrogr. Mitt. 11, 140-62. |  | | Report (chapter) | | arbitrary, because similar rocks of the same ages do occur farther N in New Mexico (Foord et al. 1983)...these rocks represent primitive magmas although a few do carry ultramafic xenoliths. Schieffer & Nelson (1981)...amphiboles and biotite (Table 2). Fluorite and zircon are common accessory phases. Examples are described...rocks (Figs 3(c) and 3(d)). Peralkaline varieties do occur in the metaluminous belt (Cepeda & Henry 1983;...increasing Zr/Ti and Nb, and by decreasing K/Rb. Zircon is a microphenocryst phase in many samples of quartz |  | Galli, A., Le Bayon, B., Schmidt, M. W., Burg, J.-P., Reusser, E., Sergeev, S. A., Larionov, A. (2012) U–Pb zircon dating of the Gruf Complex: disclosing the late Variscan granulitic lower crust of Europe stranded in the Central Alps. Contributions to Mineralogy and Petrology, 163 (2) 353-378 doi:10.1007/s00410-011-0676-6 | Journal (article/letter/editorial) | | 10.1007/s00410-011-0676-6 ORIGINAL PAPER U–Pb zircon dating of the Gruf Complex: disclosing the late...orthogneiss sheet yield Cambrian and Ordovician zircon cores. Two deformed leucogranites and six ortho-...which compose two-thirds of the Gruf Complex, give zircon ages of 290–260 Ma. Most zircons have milky rims...peak conditions are extreme at crustal levels and do not fit any known metamorphic event in the Central...a questionable Alpine event. Oscillatory zoned zircon cores in a strongly residual granulite bolder yielded |  | | Book | | magma has taken place so that crystallites (which do not react to polarised light), in the form of tiny...basic lavas, cooling at approximately the same rate, do not normally show it because of their lower viscosity...are very fine grained to glassy. Some petrologists do not attach much importance to this three-fold division...in little prisms and needles, small crystals of zircon, and grains of opaque ore are almost ubiquitous...are the essential constituents. A few grains of zircon are visible in the centre; X 18. B. Kila Hills |  | | Book | | mineraux circulant dans les galeries de mines. On se do it de considerer ces produits comme douteux en tant...decroissement se repe te sur toutes les parties d u noyau do nt telle est la ressemblance q ue l'on pe ut s ubstituer...cettc classe sont : anatase, rutile, cassiterite, zircon, idocrase, apophyllite, groupe des wernerites....sulfures (PbS, MnS), oxydes (MgO, NiO), etc... Le zircon Zr[SiO 4] et le xenotime Y[PO 4], l'andalousite...Riebeckite, en cristaux de plus d'une tonne, d' Alter Pedroso, Portugal. - Corindon, cristal en tonnelet de 250 |  | | Report (issue) | | the Petite SoleCordoba fault (western Spain and Portugal). This comparison suggests that this fault acted... 3. This belt separates two different structural do¬ mains: the southwesternmost domain is characterized...peralkalic igneous rocks (A, Arronches; AP, Alter Pedroso; E, Elvas; V, Vigo); 2, blastomylonitic belt...Hercynian sensu stricto folds be¬ cause the former do not have axial plane cleavage. The fold axes usually...places; for example, the Valongo anticline of east Portugal. The general distribution of the “en echelon” |  | | Journal (article/letter/editorial) | | contain compIex Zr- and Ti-silicates instead of zircon and sphene and they are rich in F, Cl and H 2 0...of the pegmatite are several centimetres long and do not show preferred orientation. The rock contains...NW-SE contain a good deal of steenstrupine. The veins do not cut the lujavrite, but in a few of the diagonal...steenstrupine (fig. 30). The grains of steenstrupine do not disturb the lamination of the lujavrite. This...also a few large platy crystals of microcline which do not showevidence of deformation but are subject to |  | | Journal (issue) | | contain complex Zr- and Ti-silicates instead of zircon and sphene and they are rich in F, Cl and H 2 0...of the pegmatite are several centimetres long and do not show preferred orientation. The rock contains...SE contain a good deal of steenstrupine. The veins do not cut the lujavrite, but in a few of the diagonal...steenstrupine (fig. 30). The grains of steenstrupine do not disturb the lamination of the lujavrite. This...also a few large platy crystals of microcline which do not show evidence of deformation but are subject |  | | Book | | kimberlites continue to defy precise classification, but we do now have improved characterizations rather than the...publishers. To produce this edition all I have had to do is to generate PDF (Portable Document Format) files...printer – a much simpler task! The software used to do this included Adobe PageMaker®, for editing the entire...olivine, opaque minerals, accessory minerals (e.g. zircon, apatite, titanite), epidote, allanite, garnet...classifications is appropriate for the rock in question. To do this in a consistent manner, so that different petrologists |  | | Book | | Surface weathering is not the only process that may alter both magmatic and sedimentary rocks. They may also...fractions, show the same ratios to one another as do the oxide molecules or elementary atoms present in...in the tetrahedron fm-—c—2al—alk’, and when they do so are close to the plane fm-—c—2alk. Distinctions...lithosphere, in which O predominates. There, however, they do not participate to any great extent in the typical...according to the type of structure. Certain kz values do, however, tend to predominate. Si, for in- stance |  | | Report (volume) | | Obviously, samples showing recognizable metasomatism can do so only on a local scale, and because volcanically...isotopes e x c e p t t h a t t h e i n c l u s i o n s do r e c o r d s o m e h i g h e r 87Sr/S6Sr ratios...composition of alkaline rocks: new data from southern Portugal and East Africa. Contrib. Mineral. Petrol. 56...Di-Ne join in this system diopside and nepheline do not coexist as liquidus phases but are separated...(as NaA!SiO4 and NaA1Si3Os) would not appreciably alter their conclusions. The expansion of the primary |  | | Book (volume) | | Modern History; But in an encythe various volumes do not cover the same field or touch the same materials...renderings, obscured by complicated accents, which do service in purely learned circles and have a scientific...parts must be remembered by any reader who desires to do justice to the treatment of any large subject. Cross-references...Encyclopedia is not called upon any direct part. It has to do with knowledge, rather than opinion, and to It cannot...whether in Europe or America, it is impossible to do adequate justice here. The interest shown in the |  | | Book (volume) | | . Hatchettolite . . . . . . . . . . . . . . .. Zircon ...................... Paragenesis .............. . . . Varieties and Decomposition Products of Zircon ....... Hyacinth ................. Wisaksonite... 79). Über die Möglichkeit, die Genese und das Alter von Eruptivgesteinsmassiven aus dem Habitus der...des Vork. Lage der Aufbereitung Cudgen Rutil{' Zircon Cudgen Headland, Strand und Vordüne Cudgen Headland...Mooball Station, 39 km südlich der Grenze .-375 94 Zircon Rutil Limited Seven Mile Beach und Tallow Beach |  | | Book (edition) | | (268). Calyptolite. mineral. It is a variety of zircon, ZrSi0 4 C.A.M. proprietary preparation of A ...Caoutchouc, Mineral. See Elaterite. Gapa Homen. See Cipo do Cabod6. Caparsolate. Thiacetarsamide sodium. (525)...protein. Ciplyte. A mineral, 4Ca0.2P 2 5 .Si0 2 Cipo do Cabodo (Capa Homen). A preparation of Davilla rugosa...v.). Dead Cotton. Cotton fibre from plants. They do not spin well unripe and are difficult to dye...Norval. Diocroma. A mineral. It is a variety of zircon. A proprietary preparation of hydrocortisone in |
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Alter Pedroso, Alter do Chão, Alter do Chão, Portalegre, Portugal