... during the Lower–Middle Pennsylvanian melting events. Detrital zircon ages of the Pinhão Formation (Douro Group) have contrasting sources to units from the Beiras Group, which may indicate the presence of a barrier that prevented older detrital components from reaching the Douro basin. However, at odds...

...Joel D. Grice; Pete J. Dunn; Robert A. Ramik Abstract Jahnsite-(CaMnMn), a new mineral species from Mangualde, Beira, Portugal, occurs as equant, brownish yellow crystals to 0.5 mm, associated with phosphosiderite, zodacite, varulite, and microcline. The mineral is transparent and has a vitreous...

...Clifford Frondel Abstract Sabugalite is a new member of the autunite group with the composition HAl(UO 2 ) 4− (PO 4 ) 4 ·16H 2 O. Analyses are cited of material from the Mina da Quarta Seira, Sabugal, Beira province, and from Kariz, Minho province, in Portugal; a third occurrence is noted from...

... (correlative of the Beiras Group; Medina et al. 1998 ) from the Ediacaran–Fortunian Ibor Group (Linnemann et al . 2018; Talavera et al. 2015 ). The Ediacaran Lower Alcudian–Domo Extremeño Supergroup consists of a monotonous succession of greywacke and shale with a few beds of sandstone and conglomerate...

...-Cambrian metasedimentary rocks (the Schist-Greywacke Complex, or Beira Group) overlain unconformably by the Early Ordovician Armorican quartzite ( Diez-Fernandez et al., 2013 ). Fig. 1. Geologic map of the Iberian massif, with Panasqueira location. The map is adapted and simplified from Diez...

... in the Schistose-Greywacke Domain – the Beira Baixa–Central Extremadura tonalite–granodiorite belt – which resembles a continental magmatic arc. This belt is contemporaneous with the Ollo de Sapo magmatic event further north in the Central Iberian Zone. Early Ordovician tonalite–granodiorite U–Pb...

... investigations in the Aguiar da Beira, Granite Area, Northern Portugal. PhD Thesis. University of Amsterdam. Brun J. P. Cobbold P. R. Strain heating and thermal softening in continental shear zones: a review Journal of Structural Geology 1980 2 149 158 Burg J. P. Iglesias M...

...-chlorite schists of the Beira group that contain as much as 7 wt% iron oxide and as much as 0.1 wt% manganese oxide ( Polya, 1989 ). Trace metal enrichment of the schist occurs up to several kilometers away from the altered granite cupola ( Polya, 1988 ). At the deposit scale, the highest tungsten grades...

... of a compositional gap between the K- and NH 4 -micas was proposed by Juster et al. (1987) . In the Douro-Beira samples, the simultaneous presence of two groups of mica compositions, one K rich and the other K poor, is demonstrated by XRD diagrams (Fig. 2 ), lattice fringe images (Fig. 7 ), SAED (inset Fig. 8...

.... To the north, however, the basement is characterized by a more varied lithology of pelites intercalated with abundant conglomerates and limestones or dolomites ( Oen 1970 ; Teixeira 1972 ; Schermerhorn 1977 ). Based on this contrast, these basement formations have been assigned to the Beiras and Douro groups...

... lines: Etosha-Griqualand-Transvaal (EGT) Axis and Okavango—Kalahari—Zimbabwe (OKZ) Axis (from Moore, 1999 ). Cities: B: Beira; CT: Cape Town; D: Durban; H: Harare; L: Luanda; M: Maputo; P: Pretoria; W: Windhoek. The Zambezi system, illustrated in detail in Figure 2 , is by far the largest...

... but many people slept through the event, which suggests that the intensity there did not exceed IV. In Beira, Mozambique's second city, located on the coast about 220 km northeast of the earthquake, shaking was stronger and caused great alarm among the population, indicating that intensity may have reached...

... in the Angoche Basin and east of the Beira High ( Fig. 3 ). Fig. 3. Possible SDRs, volcanic flows and dykes associated with the Bouvet hotspot. Most dyke locations are from Geological Survey of Botswana (1978 ), Chavez Gomez (2000) , Mekonnen (2004) and Reeves (2000) . The section location...

...) ERV-1 Sediment Ervedal da Beira 8 ERV-2 Sediment Ervedal da Beira 8 ERV-3 Sediment Ervedal da Beira 8 ERV-BO Sediment Ervedal da Beira The normalization of chemical concentrations using Sc ([X]/[Sc]) gives more indicators and/or enhances the differences between...

... of the Iberian Massif: 1—Porto-Tomar; 2—Malpica-Lamego; 3—Juzbado-Penalva do Castelo; 4—Douro-Beira; 5—Huebra; 6—Tamames; 7—Palas de Rei; 8—Coimbra-Córdoba; 9—South Iberian. In the Iberian Massif of the Variscan orogenic system, strike-slip shear zones and upright folds are considered the result...

... flyshoid Douro-Beiras Supergroup of Ediacarian to Cambrian age ( Martins et al. 2012 ; Talavera et al. 2012 ; Romão et al. 2013 ; Jensen & Palacios 2016 ). Different granites have been identified and mapped in the region, with distinct textures, mineralogy and deformation patterns: pre-D 1...

... of the whiteite group from Mangualde, Beira, Portugal . Am. Mineral. , 75 , 401 – 404 . Henry D.J. Novák M. Hawthorne F.C. Ertl A. Dutrow B.L. Uher P. Pezzota F. ( 2011 ): Nomenclature of the tourmaline-supergroup minerals . Am. Mineral. , 96 , 895 – 913 . Kampf...