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Browsing Geogaceta -- Nº 08, (1990) by Issue Date
Now showing items 1-20 of 47
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Las unidades tectosedimentarias del margen septentrional de la Depresión del Ebro en el sector Luesia-Riglos (provincias de Zaragoza y Huesca)
(Sociedad Geológica de España, 1990)At the septentrional margin of the Ebro Basin, the conglomeratic facies of Uncastillo Formation correspond to two complex cyclic Tectosedimentary Units (TSU U1 and U2). Towards the West, these TSU lie on Campodarbe Formation ... -
Turbiditas oolíticas cretácicas al norte de Vélez Blanco (Subbético interno, provincia de Almería)
(Sociedad Geológica de España, 1990)In the Internal Subbetic Middle and Upper Cretaceous oolite turbidites occur. Two main type of facies are present: 1) Conglomeratic beds (A2 facies) composed of clasicts of very different lithologies and ages, and 2) Oolit ... -
Trilobites y goniatites de la cuenca carbonífera de los Santos de Maimona: deducciones bioestratigráficas
(Sociedad Geológica de España, 1990)In the Santos de Maimona Carboniferous Basin (Badajoz, SW of Spain), trilobites and the goniatites have been distinguished for first time, given a new significant biostratigraphy precision. The recognised trilobites species ... -
Observaciones sobre algunos Diques de Pórfido NS del sector de Alpedrete (Sistema Central)
(Sociedad Geológica de España, 1990)Some NS-oriented porphyry dikes are studied in the area of Alpedrete in the Spanish Central System. These dikes display several structures indicative of the following: direction and sense of the magmatic flow (sheared ... -
Las diaclasas y diques en el Plutón de Caldas de Reyes (Provincias de La Coruña y Pontevedra. España)
(Sociedad Geológica de España, 1990)This paper deals with the role of the arrangement of joint systems and dykes of the latehercynian Caldas de Reyes granitic pluton. Despite of the role of late and posthercynian deformation phases on the genesis of the joint ... -
Tectónica y sedimentación en el margen oeste del «rift» terciario del valle de Ayora-Cofrentes (Valencia)
(Sociedad Geológica de España, 1990)The Ayora-Cofrentes valley (Valencia) presents a rift-like structure of probable Lower Tertiary age. Its western margin is formed by a system of lystric faults with a vertical displacement of 300 m. This main fault is ... -
Preservación de estructuras internas y externas primarias en pillow-lavas del Paleozoico medio-superior del Sarrabus (SE de la isla de Cerdeña, Italia)
(Sociedad Geológica de España, 1990)This note describes the presence of pillow-lava within the palaeozoic marine materials (Silurian-Devonian) of Sarrabus region, SE Sardinia, Italy. Pillow structures are developed on basalts, and some primary structures ... -
La transgresión del Cenomaniense superior en el Prebético
(Sociedad Geológica de España, 1990)An assymetrical megasequence of uppermost Cenomanian-Turonian (?) age is delimited and studied in Prebetic area: After a rapid transgression (which produces platform drowning), a more pausible and progressive progradation ... -
Rasgos estructurales de la Sierra de Salinas y zona de los Mallos (Sierras Exteriores, Prepirineo, provincias de Huesca y Zaragoza)
(Sociedad Geológica de España, 1990)The structure of Sierra de Salinas and the area of «los Mallos» (External Sierras, Southern Pyrenees) is owed to the thrusting (overtsep sequence) and simultaneous folding (flexure) of the whole structure. The setting and ... -
Nuevas aportaciones al conocimiento geológico de la Ría del Eo (NW España)
(Sociedad Geológica de España, 1990)This paper deals with the geology of the Ría del Eo, preferently its eastern side. We have mapped in a more detailed way the different units of the Serie de los Cabos, not distinguished yet in this area. We propose a ... -
La Formación Marín: redepósito de material jurásico durante el Mioceno (zona Subbética)
(Sociedad Geológica de España, 1990)An important volume about resedimented materials during the Burdigalian has been confused with the oolite Dogger even today. This article determines the Marin Formation, litostratigraphic unit that includes these rocks. ... -
Estudio de algunos indicios cupríferos en la Depresión Geológica del Ebro (Bages, Cataluña)
(Sociedad Geológica de España, 1990)This short communication is based on the research developed on three cupriferous traces in the Catalonian area of Bages. These three traces are found among the tertiary materials of the Artés formation belonging to the ... -
Estructuras de desvitrificación en lavas ácidas del Paleozoico medio-superior del Sarrabus (SE de la isla de Cerdeña. Italia)
(Sociedad Geológica de España, 1990)This note describes the presence of fine devitrification structures within the acid calcalkaline lavas of Sarrabus region, SE Sardinia, Italy (Silurian-Devonian). Devitrification ranges from micropoikilitic to spherulitic ... -
Estudio de la variación del grado de desorientación de subgranos en cuarcitas de la zona Este del Sistema Central y Macizos Paleozoicos de la Cordillera Ibérica
(Sociedad Geológica de España, 1990)The spatial variation of the geometric mean of intracrystalline extinction angle (GMA) demonstrates the reliability of the structural subdivisions previously established for the Central-East Iberian Massif and constitutes ... -
El Terciario de la cubeta de Muniesa (Provincia de Teruel)
(Sociedad Geológica de España, 1990)Two tectosedimentary units have been recognized in the Tertiary Muniesa Basin which are separated by an angular unconformity. They are constituted by detritical facies only. Such facies correspond to alluvial fan systems ... -
El límite Pleistoceno-HoIoceno en el yacimiento de la Cueva de Nerja (Málaga)
(Sociedad Geológica de España, 1990)The chronostratigraphical sequence of the Nerja Cave, obtained from sedimentological and archaeological data and from radiocarbonic analysis, contains the Pleistocene-Holocene boundary -
Empleo de diagrafías para la identificación del Cretácico entre la Cordillera Ibérica y la Sierra de Altomira
(Sociedad Geológica de España, 1990)Cretaceous of the covered area between the Iberian Cordillera and the Altomira Range has been analyzed using well logs. Belmontejo 1A-Ledaña 1 correlation allowed the stablishment of the different Lithostratigraphic Units ... -
El drenaje subterráneo de la Cordillera Ibérica en la depresión del Ebro: aspectos geológicos
(Sociedad Geológica de España, 1990)Six hydrogeologic cross-sections, all of them placed along the contact between the Iberian Chain and the Tertiary Ebro Basin, are presented in this work. These cross-sections avoid us to establish a «geometric model» which ... -
Implicaciones de los enclaves máficos microgranulares en la petrogénesis de los granitoides calcoalcalinos hercínicos
Castro Dorado, Antonio
; Moreno-Ventas Bravo, Ignacio; Rosa Díaz, Jesús de la (Sociedad Geológica de España, 1990)
Hercynian calc-alkaline granitoids are characterized by the presence of microgranular magmatic enclaves of tonalitic to diorite composition. Recent studies of these enclaves and host granitoids reveal that they were generated ... -
Formación de una cubeta sinclinal en un contexto extensivo: la cuenca miocena de Rubielos de Mora (Teruel)
(Sociedad Geológica de España, 1990)The Rubielos de Mora basin developped during early and middle Miocene in an extensional context Mesozoic layers beneath the basin are synclinally folded and Miocene beds are located in the core of the fold and show an ...
