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Browsing Geogaceta -- Nº 12, (1992) by Title
Now showing items 1-20 of 43
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Algunos rasgos sedimentarios relacionados con la presencia de vegetación enraizada
(Sociedad Geológica de España, 1992)The infilling of erected tree trunks is due to several flood events, as can be inferred from its textural and structural features. Previous floodings would have accumulated sediment until it reached the rim of the trunks, ... -
Ambientes sedimentarios, significado paleoecológico y fosilización de icnitas de dinosaurios. Yacimientos del Jurásico de Asturias
(Sociedad Geológica de España, 1992)Upper Jurassic dinosaur tracks of Asturias (N Spain) are confined to the La Nora, Vega, Terehes and Lastres Formations. The Jurassic record of this area indicates the occurrence of large and diverse populations including ... -
El arrecife Bía (Mioceno superior de la Cuenca de Fortuna, Murcia). Bioconstrucción de Tarbellastraea Sp. y Porites Sp. compuesta de unidades menores
(Sociedad Geológica de España, 1992)The Cómala reef complex (Upper Miocene , Fortuna Basin, Murcia ) is m ade up of four bioconstructions each separated by sandstone/shale units. One of these bioconstructions, the Bfa reef, has been m apped in detail, allow ... -
Bioturbación de invertebrados y microcodium en faciès lacustres y fluviales: Thanetiense del Valle de Ager (Lérida)
(Sociedad Geológica de España, 1992)Lower Thanetian (Paleocene) fluvial and lacustrine deposits in Ager Basin contain frequent invertebrate burrows. These burrows are cylindrical, unlined and internally meniscate or maslve. Four forms are described in detail, ... -
Características estructurales y geométricas de la falla de desgarre de Lorca-Alhama
(Sociedad Geológica de España, 1992)The Lorca-Alhama fault is one of the more tectonic and seismically active sinistraI strike-slip fault of the eastern Betics. Its complex structural pattern records simultaneous development of ex- tensional and contractional ... -
Características hidroquímicas de las aguas termominerales de los Baños de Alhama de Murcia (Murcia)
(Sociedad Geológica de España, 1992)The Baños de Alhama de Murcia waters are calcium-sodium-magnesium sulfhate types and have a high temperature (44-45 °C) and conductivity (3.800-4.000mhosfcm); with cluster and factorial analysis of variables the study is ... -
Características mineralógicas de una sóvita pirofanítica de la Pta. del Peñón Blanco, Fuerteventura, Canarias
(Sociedad Geológica de España, 1992)A carbonite vein composed by caldte and pyrophanite is described. Pyrophanite, a very unusual mineral phase in this kind of rocks is formed at low temperatures. This vein is classified as a late carbonatite -
Características y procesos postemplazamiento de la ignimbrita de la playa de San Juan (Tenerife)
(Sociedad Geológica de España, 1992)The Playa de San Juan Ignimbrite is a peralkaline pyroclastic flow that shows important facies variations depending on its emplacement position. The ignimbrite is strongly welded, where slopes exceed about 2CP dipping ... -
Contribución del análisis icnológico en la interpretación del origen de la rítmita margoso-calcárea de edad Kimmeridgiense inferior (Zona Platynota) en el Prebético Central
(Sociedad Geológica de España, 1992)In the Central Prebetic the sediments of Early Kimmeridgian age (Platynota Chron) are represented by rhyth¬mic successions which are make up by marls, marly limestones and limestones. In the context of an integrated research ... -
Determinación de fábricas mediante la anisotropía de la susceptibilidad magnética (ASM) en rocas con diferente grado de deformación. Ejemplo de materiales eocenos de la cuenca de Ainsa (Pirineo Central)
(Sociedad Geológica de España, 1992)The anisotropy of magnetic susceptibility (AMS) has been used to establish the petrofabric of some Eocene grey marls from the southern Pyrenees. The rocks are affected by increasing deformation conditions fron wakly to ... -
La erupción del volcán Taco (Tenerife, Canarias)
(Sociedad Geológica de España, 1992)We consider Taco volcano as a simple strombolian eruption without hydromagmatic characteristics by its volcano-stratigraphic, petrological and geocheminal features. Trachytic pyroclastic deposits from «Canadas volcano » ... -
Estratigrafía del abanico deltaico de Santa Orosia (Eoceno medio y superior de la cuenca de Jaca, Prov. de Huesca)
(Sociedad Geológica de España, 1992)The study of the Santa Orosia fan delta north of the Basa anticline (Jaca Basin, Southern Pyrenees) has described the type 2 Jaca-6 sequence. The upper Sabihinigo sandstone, storm and tidal influenced, enhaces the shelf ... -
Estructuras bioturbadas de las facies Muschelkalk de la Zona Subbética
(Sociedad Geológica de España, 1992)In Majanillos Formation (middle -upper Ladinian age) of the Subbetic Zone, the bioturbate textures are related with deep ramp facies. F/ieTlialassinoides trace fossil is placed in the middle levels of the formation ... -
Estructuras extensionales en los materiales Aipujárrides al E de Málaga (Sierra Tejeda, Cordilleras Béticas)
(Sociedad Geológica de España, 1992)The main deformation in the Tejeda and Canillas de Albaida Units is produced during a heterogeneous simple shearing regime that generates a planar-linear fabric. This simple shear has a topto-the-westsouhwest sense of ... -
Estudio cuantitativo de los foraminíferos planctónicos en el estratotipo de! límite Eoceno/Oligoceno en Massignano (Apeninos, Italia)
(Sociedad Geológica de España, 1992)The quantitative study of the planktic Foraminifera from the Eocene/Oligocene boundary stratotype at Massignano (Apennines, Italy) has been accomplished for the first time, This study allow us to establish the fauna/ changes ... -
Geología y fauna de los yacimientos kársticos de Atalaya y Artesa (Cuenca de Granada, Cordillera Bética)
(Sociedad Geológica de España, 1992)Geology and fauna of two paieokarsts sites are analyzed. The sites are placed in the Granada basin. They indicate two stage karstic active during the Quaternary -
Las Icnitas de mamíferos del sur de Alicante (España)
(Sociedad Geológica de España, 1992)South of Alicante, in the eastern end o f Sierra del Colmenar, an outcrop of bird and mammal fossil footprints (icnites) is well exposed, the latter show in gan excellent state of preservation. In this paper the mammal ... -
Icnofacies de Skolitos en el Mioceno Superior del borde meridional de la Cuenca del Guadalquivir (Arcos de la Frontera, Cádiz)
Clauss Klamp, Federico Luis; Mayoral Alfaro, Eduardo
(Sociedad Geológica de España, 1992)
An ichnological assemblage from the Upper Miocene bioclastic calcarenites in the Southern edge of the Guadalquivir Basin is studied. The Skolitos ichnofacies is recognized from two basic ichnocoenoses. The first one is ... -
Icnofósiles, sedimentación episódica/ tempestitas fangosas y «black shales» de ambientes seudoanóxicos, en sucesiones marinas de plataforma y rampa
(Sociedad Geológica de España, 1992)Déposition of blade shale fades on marine shelves and ramps has been habitually attributed to several causes related to oxygen-depleted bottom waters: sea level fluctuations, very slow water circulation, high organic ... -
Inoceramids in the Plentzia Fm. (Upper Cretaceous, Basque-Cantabrian Region): Preliminary Isotopic and Geochemical Data
(Sociedad Geológica de España, 1992)Se han realizado análisis isotópicos de ¿"O y SnC de diversas muestras de calcarenitas y bivalvos inocerámidos (Inoceramus), así como el contenido en ppm (Sr, Co, Cd, Cu, Fe, Mn, Mg, Zn, Ca, Na y Ba) mediante microsonda ...
