Cinemática rotacional del cabalgamiento basal surpirenaico en las Sierras Exteriores Aragonesas: Datos magnetotectónicos

The magnetotectonic analysis of 32 sites located along the External Sierras (mainly in Middle Eocene marls) shows the primary character of the magnetisation and pennits the differences between the paleovectors obtained to be interpreted as a result of the rotational kinematics of the southpyrenean floor thrust in the study area. The constancy of the directions of the defined unblocking intervals (300"-425°C for the thermal treatment) and the homogeneity of the magnetic carriers (these were always low coercitivity phases, probably sulphides andlor magnetite) prove the stability of the magnetisation. On the other hand, the primary character of the magnetisation (Middle Eocene) can be demonstrated by: a) the constancy of the magnetic inclination (47.3 +/- 1.7) and its similarity with the reference direction; b) the occurrence of reversals, and the positive result of the fold-test made in the Pico del Águila anticline; c) the consistency between the reference direction (DEC = 005", INC = 51°, a95=6 ") and the direction obtained for the authocthonous footwall (DEC = 005", INC = 38", a95= 8") which crops out in the western sector of the Sierras Exteriores thrust front. The interpretation of the paleomagnetic data within the External Sierras structural framework clearly shows that the kinematics of individual thrust sheets involves a clockwise component, at least during a period of their evolution. The maximum rotation values were found in the western and central sectors (42" and 30" respectively). The age of the rotation decreases towards the west along with the age of deformation of the cover rocks. Starting in late Priabonian the kinematics of the thrust front resulted in a lack of rotation in the central sector of the Sierras, while the western sector undenvent a clockwise rotation. The differential movement between both sectors gave rise to the development or reactivation of structures (i. e. Rasal-Anzáñigo anticlines) that articulated the deformation of adjacent zones with different rotational components

Rotational kinematics of the southpyrenean basal thrust at the Sierras Exteriores Aragonesas: Magnetotectonic data

[ES] El estudio magnetotectónico de 32 estaciones localizadas, principalmente, en las margas de la formación Arguis a lo largo de las Sierras Exteriores Aragonesas (Pirineo Suroccidental) nos ha permitido caracterizar la estabilidad y el carácter primario de la magnetización registrada por estas rocas e interpretar las diferencias con el campo de referencia (Iberia estable) en términos de cinemática rotacional asociada al cabalgamiento basal surpirenaico en este sector. La estabilidad de la magnetización se fundamenta en la constancia de los intervalos de definición de las direcciones (300" - 425°C en el tratamiento térmico) y en la homogeneidad de los portadores magnéticos en las estaciones estudiadas (que siempre fueron fases de baja coercitividad, probablemente sulfuros y10 magnetita). Por otra parte, se puede demostrar que dicha magnetización se adquirió en el momento del depósito de las rocas (Eoceno medio) por varios motivos; la constancia de la inclinación magnética (47,3" +/- 1,7") y su similitud con la dirección de referencia; la existencia de inversiones y el test del pliegue positivo realizado con las estaciones del anticlinal del Pico del Águila; así como la congruencia entre la dirección de referencia (DEC=005", INC=51°, q5=6') y la calculada en la zona autóctona del sector occidental de las Sierras (DEC=005', INC=38', ag5=8 "). La interpretación de los datos paleomagnéticos en el contexto de la estructura deja patente la componente rotacional horaria de los cabalgamientos asociada a la formación de las Sierras Exteriores, observándose valores máximos de 42' en el sector occidental y de 30" en el central. Asimismo, la edad de dicha rotación parece migrar hacia el W (simultánea y anterior al depósito de la Fm. margas de Arguis, Priaboniense, en el sector central y simultánea al depósito de la Fm. Campodarbe, Sannoisiense-Stampiense, en el sector occidental) y se puede afirmar que ha habido rotación diferencial entre sectores adyacentes. Para explicar la no acumulación de las rotaciones es necesaria la existencia de estructuras de articulación que separarían zonas con diferente componente rotacional, como parece ocurrir en los anticlinales de Rasa1 y Anzañigo.[EN] The magnetotectonic analysis of 32 sites located along the External Sierras (mainly in Middle Eocene marls) shows the primary character of the magnetisation and pennits the differences between the paleovectors obtained to be interpreted as a result of the rotational kinematics of the southpyrenean floor thrust in the study area. The constancy of the directions of the defined unblocking intervals (300"-425°C for the thermal treatment) and the homogeneity of the magnetic carriers (these were always low coercitivity phases, probably sulphides andlor magnetite) prove the stability of the magnetisation. On the other hand, the primary character of the magnetisation (Middle Eocene) can be demonstrated by: a) the constancy of the magnetic inclination (47.3 +/- 1.7) and its similarity with the reference direction; b) the occurrence of reversals, and the positive result of the fold-test made in the Pico del Águila anticline; c) the consistency between the reference direction (DEC = 005", INC = 51°, a95=6 ") and the direction obtained for the authocthonous footwall (DEC = 005", INC = 38", a95= 8") which crops out in the western sector of the Sierras Exteriores thrust front. The interpretation of the paleomagnetic data within the External Sierras structural framework clearly shows that the kinematics of individual thrust sheets involves a clockwise component, at least during a period of their evolution. The maximum rotation values were found in the western and central sectors (42" and 30" respectively). The age of the rotation decreases towards the west along with the age of deformation of the cover rocks. Starting in late Priabonian the kinematics of the thrust front resulted in a lack of rotation in the central sector of the Sierras, while the western sector undenvent a clockwise rotation. The differential movement between both sectors gave rise to the development or reactivation of structures (i. e. Rasal-Anzáñigo anticlines) that articulated the deformation of adjacent zones with different rotational components.lEste trabajo ha sido financiado por una beca de la Institución Fernando el Católico (Dip. Prov. de Zaragoza) durante 1993 y una beca de Formación de Profesorado Universitario (M.E.C.) 1996- concedidas al primero de los firmantes, una beca CONA1 (DGA') concedida al segundo firmante, así como por los proyectos PB93-1218 DGICYT y una acción integrada Hispano-Austríaca (HU1995-0023). Ana Gómez del laboratorio de Paleomagnetismo de ICT "Jaume Almera" CSIC se encargó de buena parte de los análisis preliminares durante 1992. Carlos Sabariego (Saba) y Tomás Arauzo colaboraron en los muestreos. Todas las proyecciones estereográficas se realizaron utilizando el programa Stereonet (v. 4.9.5) de R. Allmendinger, a quien estamos muy agradecidos por su generosidad. La revisión de Jaume Dinarés fue especialmente provechosa.Peer reviewe

Cinemática rotacional del cabalgamiento basal surpirenaico en las Sierras Exteriores Aragonesas: Datos magnetotectónicos

The magnetotectonic analysis of 32 sites located along the External Sierras (mainly in Middle Eocene marls) shows the primary character of the magnetisation and pennits the differences between the paleovectors obtained to be interpreted as a result of the rotational kinematics of the southpyrenean floor thrust in the study area. The constancy of the directions of the defined unblocking intervals (300"-425°C for the thermal treatment) and the homogeneity of the magnetic carriers (these were always low coercitivity phases, probably sulphides andlor magnetite) prove the stability of the magnetisation. On the other hand, the primary character of the magnetisation (Middle Eocene) can be demonstrated by: a) the constancy of the magnetic inclination (47.3 +/- 1.7) and its similarity with the reference direction; b) the occurrence of reversals, and the positive result of the fold-test made in the Pico del Águila anticline; c) the consistency between the reference direction (DEC = 005", INC = 51°, a95=6 ") and the direction obtained for the authocthonous footwall (DEC = 005", INC = 38", a95= 8") which crops out in the western sector of the Sierras Exteriores thrust front. The interpretation of the paleomagnetic data within the External Sierras structural framework clearly shows that the kinematics of individual thrust sheets involves a clockwise component, at least during a period of their evolution. The maximum rotation values were found in the western and central sectors (42" and 30" respectively). The age of the rotation decreases towards the west along with the age of deformation of the cover rocks. Starting in late Priabonian the kinematics of the thrust front resulted in a lack of rotation in the central sector of the Sierras, while the western sector undenvent a clockwise rotation. The differential movement between both sectors gave rise to the development or reactivation of structures (i. e. Rasal-Anzáñigo anticlines) that articulated the deformation of adjacent zones with different rotational components

Transfer zone in the western part of the Central Pyrenees, example of the Oroz-Betelu- Unzue fault. Southern Pyrenees, Navarra

Based on structural, stratigraphic and gravimetric data, a regional scale N 020-040 E blind-fault, named the Oroz-Betelu- Unzue fault, extending from the western part of the Oroz-Betelu massif to the Sierra de Alaiz thrust front, is inferred. This fault would have acted as a transfer extensional structure during Early Cretaceous times and later, during the Alpine compression, the different stratigraphic and structural characteristics of the fault-blocks would have favoured the formation of major differences between the contractional structures occurring in the blocks of the Oroz-Betelu-Unzúe fault-zone. The Alaiz thrust sheet and adjacent areas represents a good example of the structural changes related to the Tertiary evolution of Oroz-Betelu-Unzué transfer zon

Releyendo el fenómeno de la neolitización en el Bajo Aragón a la luz de la excavación del Cingle de Valmayor XI (Mequinenza, Zaragoza)

Este trabajo presenta los resultados preliminares obtenidos en la excavación del Cingle de Valmayor XI, desarrollada dentro del proyecto de investigación ‘Los caminos del Neolítico’. A través del análisis de las dataciones radiocarbónicas y de una detallada lectura estratigráfica se han podido establecer tres horizontes de ocupación diferentes con cronologías que corresponden a distintos momentos del vi milenio cal bc. Se ofrece una descripción general de los eventos arqueológicos documentados en cada una de estas fases, así como de gran parte del material recuperado –cerámica, lítica, industria ósea, elementos de adorno, fauna y restos carpológicos–. Por otra parte, a la luz de las nuevas dataciones presentadas, se propone una revisión del fenómeno de la neolitización en la región del Bajo Aragón y, por extensión, en todo el valle del Ebro; también se cuestiona la identificación de contextos como propios de economías productoras simplemente a través de la presencia de ciertos elementos materiales considerados tradicionalmente como ‘marcadores neolíticos’, sin que existan variaciones con respecto a las estrategias subsistenciales o de explotación del territorio

LeishVet update and recommendations on feline leishmaniosis

Limited data is available on feline leishmaniosis (FeL) caused by Leishmania infantum worldwide. The LeishVet group presents in this report a review of the current knowledge on FeL, the epidemiological role of the cat in L. infantum infection, clinical manifestations, and recommendations on diagnosis, treatment and monitoring, prognosis and prevention of infection, in order to standardize the management of this disease in cats. The consensus of opinions and recommendations was formulated by combining a comprehensive review of evidence-based studies and case reports, clinical experience and critical consensus discussions. While subclinical feline infections are common in areas endemic for canine leishmaniosis, clinical illness due to L. infantum in cats is rare. The prevalence rates of feline infection with L. infantum in serological or molecular-based surveys range from 0 % to more than 60 %. Cats are able to infect sand flies and, therefore, they may act as a secondary reservoir, with dogs being the primary natural reservoir. The most common clinical signs and clinicopathological abnormalities compatible with FeL include lymph node enlargement and skin lesions such as ulcerative, exfoliative, crusting or nodular dermatitis (mainly on the head or distal limbs), ocular lesions (mainly uveitis), feline chronic gingivostomatitis syndrome, mucocutaneous ulcerative or nodular lesions, hypergammaglobulinaemia and mild normocytic normochromic anaemia. Clinical illness is frequently associated with impaired immunocompetence, as in case of retroviral coinfections or immunosuppressive therapy. Diagnosis is based on serology, polymerase chain reaction (PCR), cytology, histology, immunohistochemistry (IHC) or culture. If serological testing is negative or low positive in a cat with clinical signs compatible with FeL, the diagnosis of leishmaniosis should not be excluded and additional diagnostic methods (cytology, histology with IHC, PCR, culture) should be employed. The most common treatment used is allopurinol. Meglumine antimoniate has been administered in very few reported cases. Both drugs are administered alone and most cats recover clinically after therapy. Follow-up of treated cats with routine laboratory tests, serology and PCR is essential for prevention of clinical relapses. Specific preventative measures for this infection in cats are currently not available

Nurses' perceptions of aids and obstacles to the provision of optimal end of life care in ICU

Contains fulltext : 172380.pdf (publisher's version ) (Open Access

Preliminary study of brittle microstructures in the «sierras marginales aragonesas»

Brittle microstructure in the «Sierras marginales aragonesas» have been ana/ysed by means of the Right Dihedra, y-R diagrams and Etchecopar's methods. The existence of several compression directions can be interpreted as the results ofa NINE regional compression and others (maint/y ENE and E-W) linked to compressive macrostructures striking N-S. Some of the extensive stress tensors obtained can be associated to extension in the footwal/ ofthe main thrust of the sierra