Geogaceta -- Nº 33, (2002)
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Sistemas fluviales efímeros del Jurásico Superior en la cuenca Neuquina, República Argentina
(Sociedad Geológica de España, 2002)A sedimentary model for the Kimmerídgian Tordillo Formation of the Neuquén basin is proposed. Through the measurement of three strati graphic logs, an ephemeral fluvial system associated with continental mud flats is ... -
Secuencia cronoestratigráfica del Pleistoceno Superior en Sierra Morena: la cueva de La Sima (Constantina, Sevilla)
(Sociedad Geológica de España, 2002)La Sima of Constantina, located at the northermost part of Seville province, is a karstic cave with a thick terrigenous and chemical (flowstone) record. These sedimentary formations are representative of the Late Quaternary ... -
Relleno sedimentario y destrucción de una pequeña cuenca fluvio-lacustre en la Sierra Sur de Jaén (Cordilleras Béticas)
(Sociedad Geológica de España, 2002)The sedimentary infill of a small continental basin and the processes involved in its transformation into an erosionaI basin have been studied. The Otíñar basin is a fluvio-lacustrine basin developed during the Quaternary ... -
Registros de conductividad y temperatura y flujos preferenciales en el campo de Dalias (Almería)
(Sociedad Geológica de España, 2002)Groundwater temperature and electrical conductivity logs were applied to gain an understanding of the hydrogeological behaviour of a complex system. This system, compartmentalized by a large number of fractures, is that ... -
Paleoecología de los niveles lumaquélicos con Heterostegina en el Tortoniense del sector central de la Cuenca del Guadalquivir (SO España)
(Sociedad Geológica de España, 2002)The Iumaquellic levels with Heterostegina in a detritic-bioclastic succession (Km 98 section) located in the central sector of the Guadalquivir Basin has been studied. The sedimentological and micropaleontological analysis ... -
Nuevos datos sobre la actividad post-Neógena en la Isla de Mallorca
(Sociedad Geológica de España, 2002)During Neogene times Mallorca Island was subjected to an extensive regime characterized by NE-SW normal faults. On the other hand, geologic evidences indicate that this stress regime changed in Pliocene times. Thus ... -
New data on evolutive trends of Third Magmatic Cycle (Post-Roque Nublo Group) volcanism in Gran Canaria (Canary Islands, Spain)
(Sociedad Geológica de España, 2002)This note exposes preliminary data (petrography, TAS classification) obtained from a 44-samples study of lavas corresponding to the Third Magmatic Cycle of Gran Canaria island. These samples has been chosen from a 120 ... -
Water solubility in monzogranite melts: experimental and calculated water contents at 6 kbar
(Sociedad Geológica de España, 2002)Several piston-cylinder crystallisation experiments have been performed with a synthetic monzogranitic glass with different initial water contents at 6 kbar. Comparison with calculated water contents shows: 1) some differences ... -
Variaciones de salinidad en Las Albuferas de Adra (Almería)
(Sociedad Geológica de España, 2002)Water level and water salinity (expressed as electrical conductivity, EC) of the two Adra lagoons -"Honda" and "Nueva"- have been periodically recorded during the years 7999 and 2000. EC was also measured in a number of ... -
Tasas de sedimentación reciente en la Ría de Huelva
(Sociedad Geológica de España, 2002)The Ria of Huelva is located at the central sector of the Huelva Coast. It Is a mesotidal estuary supplied by two rivers (Tinto and Odiel). Tinto and Odiel rivers have small mean discharges (100.48 Hm3 and 429.40 Hm3) but ... -
Morfología de la pirita diagenética en sedimentos recientes del estuario del Río Odiel (SO de España)
(Sociedad Geológica de España, 2002)Diagenetic sulphurs have been observed in subsurficial sediments from Odiel River Estuary. These sulfurs display three distinct morphologies: microcrystal aggregates, framboidal aggregates and euhedral pyrite macrocrystals. ... -
Modelizacion del transporte sedimentario longitudinal en playas de poca energía. Playa de Vistahermosa (Bahía de Cádiz)
(Sociedad Geológica de España, 2002)Theoretical and empirical estimations of the longshore sediment transport were applied to a beach in the northern Cádiz Bay. In the first case, several predictive models were applied by combining energetic, morphological ... -
La transgresión Aptiense en la Sierra de Segura (Zona Prebética, provincia de Jaén)
(Sociedad Geológica de España, 2002)The cretaceous successions of the Prebetic; deposited on the Southern Iberian Continental Margin, record the later part of a rifting stage (Oxfordian to early Albian). The northern part of the sierra de Segura (jaén province, ... -
La cuenca terciaria continental del Diapiro de Murgia: la Formación Izarra (Oligoceno superior-Mioceno inferior, Cuenca Vasco-Cantábrica)
(Sociedad Geológica de España, 2002)The tertiary continental Izarra Formation (Alava, Basque-Cantabrían Basin) is formally described for the first time. Its materials were deposited on a small basin originated in the central part of the Murgia diapir. Those ... -
Internal Structure of the Évora Massif: The Évora High-grade Terrains and the Montemor-o-Novo Shear Zone (Ossa-Morena Zone, Portugal)
(Sociedad Geológica de España, 2002)The Évora Massif is divided into two major tectonic units, in order to improve the general understanding of their internal complex structure: (1) the Évora High-grade Metamorphic Terrains and (2) the Montemor- o-Novo ... -
Inicio del vulcanismo en el sector de Calañas (Faja Pirítica Ibérica). Caracterización y datación
(Sociedad Geológica de España, 2002)First volcanic rocks of the Calañas area, Central Sector of the Iberian Pyrite Belt, are felsic lavas that are included in a black shaly sequence at the bottom of the Volcano-Sedimentary Complex. This sequence is ... -
Influencia de las burbujas en la viscosidad de magmas haplograníticos vesiculados
(Sociedad Geológica de España, 2002)The changes in the viscosity of bubble-bearing haplogranitic magmas with crystallinity are a prime function of the applied deformation rate. Under high deformation rates melt and magma viscosities are found to strongly ... -
Estructuras de escape de anémonas marinas (Conichnus indet. isp.) y sedimentación en depósitos litorales del Complejo Basal Transgresivo del sector central de la Cuenca del Guadalquivir (SO España)
(Sociedad Geológica de España, 2002)The study of faunistic associations, ichnology and sedimentology of coastal deposits, that crops out in the central sector of pasive margin of the Guadalquivir Basin, allows us to make an approached reconstruction of ambient ... -
Estructuras bioerosivas de anélidos poliquetos (Serpulidae) en el Neógeno superior del Sur de la Península Ibérica
(Sociedad Geológica de España, 2002)New superficial etching traces corresponding to annelids of the family Serpulidae are described. These traces present an elongated, sinuous and/or spiralated pathway in a plan view. They consist in a very shallow central ... -
Edad minima del gossan de Las Cruces: implicaciones sobre la edad del inicio de los ecosistemas extremos en la Faja Pirítica Ibérica
(Sociedad Geológica de España, 2002)The micropalaeontogical study of glauconite sands overlying Las Cruces massive sulfide deposit (Iberian Pyrite Belt) indicates an Upper Tortonian minimum age for oxidation and the gossan genesis. Sulfide oxidation, both ...