Trabajos de Geologia最新文献

{"title":"La deformación alpina en el basamento varisco de la Zona Cantábrica","authors":"J. A. Pulgar, J. Alonso, R. Espina, J. A. Marín","doi":"10.17811/TDG.21.1999.283-295","DOIUrl":"https://doi.org/10.17811/TDG.21.1999.283-295","url":null,"abstract":"The structural relationships between the Variscan basement and the Permo-Mesozoic cover around the Cantabrian Zone show that they were jointly deformed during the Alpine deformation. The Variscan basement was uplifted and internally deformed; this internal deformation usually caused reactivation of earlier structures. Thus, Variscan folds were tightened, giving rise to steepening and reactivation of previously folded Variscan thrusts, as a result of flexural-slip mechanisms. Moreover, normal faults related to the development of Permo-Mesozoic basins were inverted. Wherein the basement is mostly shaly, the Permo-Mesozoic cover developed its own structures, mainly buckle folds, whereas the basement played a passive role. In the basement, the amount of shortening during Alpine deformation was around 20% in most areas. This value is greater in the forelimb of a large-scale fault-propagation fold developed in the mountain front, and also close to the inverted normal faults, as a result of butressing. The Alpine deformation implies a remarkable modification of the Variscan structure in some places, giving rise up to 30o of dip increase for the Variscan thrusts.","PeriodicalId":252745,"journal":{"name":"Trabajos de Geologia","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125642120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"La evolución tectónica del Sur de los Urales","authors":"A. Pérez-Estaún, Dennis Brown, Joaquina Álvarez-Marrón, V. N. Puchkov, R. Carbonell","doi":"10.17811/TDG.21.1999.265-283","DOIUrl":"https://doi.org/10.17811/TDG.21.1999.265-283","url":null,"abstract":"The Urals were formed at the end of the Paleozoic by the accretion of several lithospheric elements. A complete accretionary complex is developed at the collision zone, including: offscraping sediments, an accretionary prism, ophiolitic units and a high pressure belt. Geophysical and geological data suggest that this orogen is preserved since its formation, without evidences of post-orogenic collapse or later reactivations.","PeriodicalId":252745,"journal":{"name":"Trabajos de Geologia","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124318586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carboniferous stratigraphy of the Sierra del Brezo in northern Palencia: evidence of major uplifts","authors":"R. Wagner, C. F. W. Prins","doi":"10.17811/TDG.21.1999.385-403","DOIUrl":"https://doi.org/10.17811/TDG.21.1999.385-403","url":null,"abstract":"Carboniferous lithostratigraphic units are analysed for the Sierra del Brezo area south of the Ruesga Fault at which the northern branch of the Cantabric-Asturian orogen overrides the southern branch in northern Palencia. These belong to the Asturian-Leonese facies realm and prolong the northward facing thrust units of northern Leon eastwards in the most tightly compressed part of the Palaeozoic orogen of the Cantabrian Mountains (Figs. 1, 2). Two subareas are the ValsurbioAlmonga anticlinal structure and the Rebanal-Ventanilla subarea where the axial planes are reversed and considerable shearing took place. As in northern Leon, the uppermost Famennian - lowermost Tournaisian Ermita Formation overlies progressively older Devonian strata northwards with an erosional contact (Fig. 3). The upper Tournaisian to lowermost Namurian Genicera Formation (with three constituent members) follows all over the area after a generalised stratigraphic break. A 600 to 800 m thick development of Namurian “caliza de montana” (Barcaliente and Valdeteja formations) in the South passes northwards into much thinner (c. 40-85 m) limestones with a partial (sometimes total) elimination of the Barcaliente Formation (Figs. 4, 5). Carbonate debris flows and bioclastic limestones in shales characterise the top of the Valdeteja Formation. An erosional contact separates the Valdeteja Limestone Formation in the northern subarea from overlying shales and turbidites of the Carmen Formation. The marked stratigraphic breaks noted in the northern subarea match those found at exactly the same levels in the Revilla Nappe, some 30 km eastwards in northern Palencia. The Revilla Nappe succession, with low-angle unconformities separating an even thinner Valdeteja Formation (30 m) from Genicera Fm underneath and Carmen Fm above, apparently corresponds to the same palaeogeographic area characterised by repeated uplift as the northern subarea of the Sierra del Brezo (Fig. 6). It probably represents a strip of terrain suppressed by the Ruesga Fault which represents very considerable tectonic shortening attributable to the pre-Curavacas Palentian phase of deformation (dated as late Langsettian).","PeriodicalId":252745,"journal":{"name":"Trabajos de Geologia","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131209823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Arrecifes del Tortoniense inferior en la Cuenca de Granada, Cordillera Bética, España","authors":"P. Rivas, J. C. Braga, I. M. Sánchez-Almazo","doi":"10.17811/TDG.21.1999.309-321","DOIUrl":"https://doi.org/10.17811/TDG.21.1999.309-321","url":null,"abstract":"A small coral reef, together with oyster biostromes, of lower Tortonian age occurs north of Albunuelas in the Granada Basin (Betic Cordillera, Spain). These reefs were deposited south of a Betic island in a coastal area. The lensoid coral reef is made up of Tarbellastraea and Porites heads, intensely bored by Lithophaga. The corals grew on a bank of large oysters that colonised conglomerates. Banks of smaller oysters (O. edulis) grew on silts in more distal areas.\u0000\u0000Fossil assemblages indicate high ambient nutrient content. The hermatypic corals record a warm climatic phase in the early Tortonian in the western Mediterranean.","PeriodicalId":252745,"journal":{"name":"Trabajos de Geologia","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132190358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Petrofísica de la roca matriz","authors":"M. Montoto, R. Esbert","doi":"10.17811/TDG.21.1999.239-253","DOIUrl":"https://doi.org/10.17811/TDG.21.1999.239-253","url":null,"abstract":"La Petrofisica estudia en la roca matriz o “intact rock” sus propiedades fisicas interpretandolas en funcion de sus componentes y caracteristicas petrograficas: vacios –poros y fisuras–, uniones intergranulares, anisotropias, minerales, composicion quimica, etc. Esta interpretacion ha requerido el uso de nuevas microscopias para la observacion de tales componentes, nuevos parametros petrograficos para su descripcion y procedimientos especificos para su evaluacion. Se resumen todos estos aspectos basicos en la Petrofisica de la roca matriz de gran interes en Geologia aplicada, Ingenieria geologica, “Rock Engineering”, etc.","PeriodicalId":252745,"journal":{"name":"Trabajos de Geologia","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134088509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"La estructura de las láminas inferiores del Complejo de Cabo Ortegal y su autóctono relativo (Galicia, NW de España)","authors":"A. Marcos, P. Farias","doi":"10.17811/TDG.21.1999.201-221","DOIUrl":"https://doi.org/10.17811/TDG.21.1999.201-221","url":null,"abstract":"The High Basin of the Nalon River show fluvial valleys with a graded longitudinal profile under 750-650 m and deposits resulting from three terrace levels (T1, 30 m; T2, 10 m; T3, 3-4 m) and the present aluvial plain. The fluvial network, with a 6th order, fits to the theoretical Horton principles; there is not a correspondance between the relief parameters and the hypsometric integral value (39%), due to methodological restrictions; the geometrical parameters suggest a quick rainfall response; the low value of the drainage density (2.62 km/km2) is according to the physical basin features. The fluvial morphology is conditioned by the lithological variety of the Palaeozoic bedrock; by the Hercynian and Alpine Tectonics influence and by the Quaternary evolution of the area, which still shows a lackness of regional data.","PeriodicalId":252745,"journal":{"name":"Trabajos de Geologia","volume":"154 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115911203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Datos sobre el mecanismo de emplazamiento del manto del Esla (Cordillera Cantábrica, NW de España) aportados por las rocas de falla","authors":"M. L. Arboleya, M. Julivert, I. Zamarreño","doi":"10.17811/TDG.21.1999.47-61","DOIUrl":"https://doi.org/10.17811/TDG.21.1999.47-61","url":null,"abstract":"Los fluidos jugaron un papel importante en el emplazamiento del manto del Esla y causaron una dolomitizacion epigenetica local de su base. El emplazamiento del manto, que estuvo ayudado por la presencia de un fluido a alta presion en las areniscas del Devonico Superior, tuvo lugar inicialmente mediante episodios sismicos que causaron la reduccion del tamano de grano e inyectaron cuarzo detritico en la zona de falla. Posteriormente, el deslizamiento estable por flujo cataclastico causo la concentracion del deslizamiento sobre fracturas de tipo P que definen una foliacion cataclastica. El progreso del emplazamiento del manto causo la acomodacion del deslizamiento a lo largo de fracturas Y, responsables de la orientacion de la foliacion paralelamente a la superficie de cabalgamiento.","PeriodicalId":252745,"journal":{"name":"Trabajos de Geologia","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123158437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nuevos datos aportados por la macroflora a la datación y conocimiento de la cuenca carbonífera de Peñarroya-Belmez-Espiel (Córdoba, SO de España)","authors":"Carmen Álvarez-Vázquez","doi":"10.17811/TDG.21.1999.37-47","DOIUrl":"https://doi.org/10.17811/TDG.21.1999.37-47","url":null,"abstract":"El estudio sistematico y de la distribucion estratigrafica y temporal de las especies de macroflora presentes en casi 12.000 piezas procedentes de la cuenca carbonifera de PenarroyaBelmez-Espiel, Cordoba, SO Espana, y su analisis independiente segun zonas estructurales, ha permitido establecer por primera vez la existencia de dos areas de sedimentacion de edades diferentes: una de edad Langsettiense superior/Duckmantiense basal, coincidente con la zona de antracitas y carbones de coque, y otra, coincidente con la zona de hullas, correspondiente a la parte mas alta del Duckmantiense superior (sin que pueda descartarse totalmente la presencia de un Bolsoviense inferior).","PeriodicalId":252745,"journal":{"name":"Trabajos de Geologia","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116914609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"La evolución tectónica de la ofiolita del Careón (Orógeno varisco, NW España)","authors":"F. D. García, R. Arenas, J. R. M. Catalán, J. G. D. Tánago, G. Dunning","doi":"10.17811/TDG.21.1999.67-79","DOIUrl":"https://doi.org/10.17811/TDG.21.1999.67-79","url":null,"abstract":"El estudio de la ofiolita del Careon aporta datos sobre la naturaleza de un oceano Paleozoico y sobre los primeros estadios de la formacion de la cordillera Varisca. La ofiolita, de edad Devonico Inferior, se compone de una parte mantelica de composicion harzburgitica y dunitica serpentinizadas, y de una parte cortical constituida por gabros de grano grueso y pegmatoides. Ambas fueron intruidas por numerosos diques de diabasa. Los procesos de convergencia se iniciaron poco tiempo despues de la formacion de la corteza oceanica y aparecen registrados en un abanico de cabalgamientos imbricados y enraizados en el manto. La exhumacion de la ofiolita se produjo mediante el desarrollo de despegues extensionales en la parte superior del complejo de acrecion, que son simultaneos con cabalgamientos desarrollados en la parte inferior, y que afectaron al margen continental de Gondwana.","PeriodicalId":252745,"journal":{"name":"Trabajos de Geologia","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122017356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Superposición de ciclos orogénicos: el ejemplo de la Zona de Ossa-Morena (Macizo Ibérico)","authors":"L. Eguíluz, B. Ordóñez-Casado, J. I. G. Ibarguchi, Á. Apraiz, B. Ábalos","doi":"10.17811/TDG.21.1999.79-97","DOIUrl":"https://doi.org/10.17811/TDG.21.1999.79-97","url":null,"abstract":"The Ossa-Morena zone bears evidence of intense Cadomian deformation and metamorphism affecting the whole continental lithosphere. Subsequent reactivation during the Hercynian orogeny was related notably to transcurrect tectonics responsible for the final structure of the zone. In this study, we describe the main features resulting from superposition of the two orogenic periods, Cadomian and Hercynian, and a correlation with similar areas of other pre-Mesozoic European massifs is attempted. Finally, we propose a geodynamic model from the latest Proterozoic to the Carboniferous that accounts for the geological evolucion of the area.","PeriodicalId":252745,"journal":{"name":"Trabajos de Geologia","volume":"1219 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114995517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}