Results 111 to 120 of about 3,000 (151)

Petrogénesis de los diques alcalinos de Errigoiti (magmatismo de edad Cretácico Superior en la Cuenca Vasco-Cantábrica)

open access: yes, 2017
En la localidad vizcaína de Errigoiti afloran una serie de diques emplazados en las secuencias volcanosedimentarias del Cretácico Superior. Estos diques, constituidos por rocas alcalinas, abarcan un amplio rango composicional (SiO=48.78-61.92%) que incluye basaltos alcalinos, traquiandesitas y tefrifonolitas.
Sarrionandia Eguidazu, Fernando   +3 more
openaire   +1 more source

O granito de Coentral revisitado: idade U-Pb de zircão [PDF]

open access: yes, 2011
O granito de Coentral forma um pequeno plutonito, aflorante no bordo oeste da Zona Centro Ibérica, próximo do limite com a Zona de Ossa Morena, que intruiu metassedimentos do Grupo das Beiras.
Antunes, I.M.H.R., Gomes, E.M.C.
core  

El magmatismo (Ortoneises y volcanismo del Ordovícico Superior) del Paleozoico de los Catalánides. [PDF]

open access: yes, 1991
En el presente trabajo se caracterizan petrológica y geoquímicamente las rocas metavolcánicas del Ordovícico Superior de los Catalánides (Gavarres y Guilleries) y los ortoneises de las Guilleries.
Barnolas Cortina, A.   +1 more
core   +1 more source

a Costa pluton, an expresion of S- type magmatism in the northeastern sector of the Sierra de Velasco, Sierras Pampeanas [PDF]

open access: yes, 2006
Estudios combinados de petrología, química mineral y geoquímcia de roca total revelan la presencia de dos unidades graníticas peraluminosas con minerales aluminosos magmáticos tales como granate y mica blanca y la presencia distintiva de turmalina.
Alasino, Pablo Horacio   +3 more
core  

Internal Ossa-Morena Zone Ophiolitic Sequences: geodynamic implications for the evolution of the SW branch of the Iberian Variscan Chain [PDF]

open access: yes, 2005
The Internal Ophiolitic Sequences correspond to allochthonous oceanic crust fragments that outcrop near the SW boundary of the Ossa-Morena Zone (Evora-Beja Domain), in an internal position relative to the Beja-Acebuches Ophiolitic Complex.
Araújo, Alexandre   +3 more
core  

Química-Mineral das lavas da ilha de Santa Maria (Açores):implicações petrogenéticas [PDF]

open access: yes, 2012
Relatório de projeto no âmbito do Programa de Bolsas Universidade de Lisboa/Fundação Amadeu Dias (2011/2012). Universidade de Lisboa.
Santos, Susana
core  

The Precambrian/Lower Cambrian pluton from Vila Nova [PDF]

open access: yes, 2010
The Vila Nova pluton is a small, Pre-Variscan granitic body that intruded rocks of the Central Iberian Zone near the contact with the Ossa Morena Zone and is affected by several shear zones and faults.
Antunes, I.M.H.R.   +2 more
core  

Upper Paleozoic Dikes of the Marão Mountain (Northern Portugal); results of intra orogenic Extension? [PDF]

open access: yes, 2001
[Abstract] In the Marão mountain occur hercynian mafic veins cutting the Schistose Formation of the Landeilian age. The geochemistry of these rocks present high concentrations on Ti ,P, Zr, Nb, Ba, and REE (Ti O2= 1.23-1,39 %, P2O5= 1.32-1,60 %, Zr = 565-
Coke, C.   +3 more
core   +1 more source

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