La cuenca de Tirinesse de edad Plioceno inferior (SO de Oued Laou, Rif, Marruecos): propuesta de un modelo de formación

The Tirinesse basin, filled mainly by lower Pliocene marine sediments, is a small tectonic graben bounded by two NE-SW normal faults, with the eastern one surpassing 500 m in throw. These faults proved to belong to a much longer system of faults that transversally cut the entire Rifian Internal Zone. The subsidence of this basin was controlled by a jointed scissor movement of the two faults, which rotation axis coincided with the basin itself. This explains the important thickness of its sedimentary infilling, mainly occurred during the ZancleanLa cuenca de Tirinesse, rellena por sedimentos marinos del Plioceno inferior, es una pequeña fosa tectónica limitada por dos fallas normales de dirección NE-SO, de las que la oriental tiene un salto vertical que supera los 500 m. Estas fallas forman parte de un sistema de fallas mucho más largo que corta transversalmente la Zona Interna Rifeña. La subsidencia de la cuenca fue controlada por el movimiento conjugado en tijera de ambas fallas, cuyo eje de giro coincide con la posición de la cuenca. Esto explica la importancia de su relleno sedimentario ocurrido fundamentalmente durante el Zancliens

Subsidencia y levantamiento durante el Plio-Cuaternario en los sectores de Oued Laou y Tirinesse (Zona Interna Rifeña, Marruecos)

The Oued Laou area and the Tirinesse basin are filled with early Pliocene (Zanclean) marine sediments very slightly deformed but currently outcropping at different altitudes. In Tirinesse area Zanclean sediments reach high altitudes (+600 m), whereas coeval sediments appear near the coastal level in Oued Laou area and even more than 100 m under the sea level in a borehole near the coast. The difference of altitudes is explained by two successive processes. First there was an important regional subsidence permitting sedimentation. Moreover, in the Tirinesse basin, due to the combined movement of the two SW-NE conjugated normal faults, an additional tectonic subsidence took place. Later, a regional and not homogenous uplift, progressively more important to the west, occurred in the Rifian Internal Zone, then surpassing the effects of the subsidence. Differential vertical displacements also existed in a N-S directionEl valle de Oued Laou y la cuenca de Tirinesse están rellenos de sedimentos marinos del Plioceno (Zancliense) débilmente deformados aunque afloran a diferentes altitudes. En Tirinesse, el Zancliense alcanza gran altura (+600 m), mientras que sedimentos equivalentes se encuentran al nivel del mar en Oued Laou e incluso a más de 100 m bajo este nivel en un sondeo cerca de la costa. Las diferentes alturas se explican por dos procesos sucesivos. Primero se produjo una importante subsidencia regional que facilitó la sedimentación. En la cuenca de Tirinesse, la subsidencia fue más acentuada por el efecto de fallas normales SW-NE. Después, en la Zona Interna Rifeña hubo un levantamiento regional, tanto más importante cuanto más al oeste, que en conjunto sobrepasó el efecto de la subsidencia.También hubo movimientos verticales diferenciales en la dirección N-

The Paleogene successions in the upper Ghomaride unit in Talembote (Internal Rif, Morocco)

43ª Sesión Científica. Móstoles, Noviembre de 2007The lower Paleogene stratigraphic successions of the Talembote upper Ghomaride Unit represent an interval of age going from the (middle?) Ilerdian to the early Bartonian, showing a transgressive sequence interrupted by intermittent sedimentary gaps, which are indicated by surfaces of discontinuity. These sediments correspond essentially to carbonatic facies with benthic foraminifers deposited in a shallow platform that was maintained probably until the late Lutetian. The abrupt rupture of this platform allowed, during the early Bartonian, sedimentation of pelagic to hemipelagic facies in a bathyal sedimentary environment. Later, the sudden interruption of the sedimentation in the early Bartonian, indicated by a paleosoil, may be better explained by tectonic reason than eustatism taking into account many actual geodynamic reconstructions.Esta nota se ha hecho en el marco de la beca concedida a uno de los autores (R.H) por la Agencia Española de Cooperación Internacional (AECI) y del proyecto CGL 2005-00404/BTE.Peer reviewe

Revista de la Sociedad Geológica de España 23 (1-2) THE MALALYINE PLIOCENE SUCCESSION (NE RIF, MOROCCO): SEQUENCE STRATIGRAPHY AND REGIONAL CORRELATION

Abstract: Malalyine area (Northern Morocco, about 10 km NNE of Tetouan), located in the Rifian Internal Zone, hosts a sedimentary basin filled since the early Pliocene. The sedimentary filling of this basin comprises three members. Member 1: inner platform basal marls dated as early Zanclean. They are rich in thinshelled pectinids (Amussium, mainly) and characterized by Ophiomorpha burrows; Member 2: a lagoonal silty sand and conglomerate alternation containing conspicuous Thalassinoides burrows and shows welldelineated Fe-encrusted surfaces on the conglomerate beds; Member 3: fan-delta red conglomerates experiencing a pronounced thickening and upward-coarsening trend. Member 1 corresponds to the regressive stage of a late highstand regime, while the erosional surface at its top delineates the subsequent sequence boundary. Member 2 marks the onset of a new sequence, with the lime-free basal interval and the overlying Fe-surfaces representing the transgressive interval and the condensed section respectively. Member 3 marks the subsequent highstand with the well-expressed downlap surfaces pointing to a regressive regime accompanied by a prograding fan-delta. The whole Malalyine succession proved to be correlatable with a Spanish early Pliocene counterpart known in the Malaga area where it is similarly made up of marine marls (Pl-2) and above discordantly fan-delta conglomerates (Pl-3). Based on its early Pliocene age, these deposits would correlate with the Pliocene I of the eastern Betic basins. Key words: Early Pliocene, Sequence stratigraphy, Trace fossils, N Morocco. Resumen: El área de Malalyine (Norte de Marruecos, a unos 10 km al NNE de Tetuán), localizada en la Zona Interna rifeña, corresponde a una cuenca sedimentaria que se rellenó a partir del Plioceno inferior. Su relleno sedimentario comprende tres miembros. Miembro 1: margas basales de plataforma interna datadas del Zancliense inferior. Estas margas son ricas en pectínidos de concha fina (principalmente Amussium) y muestran túneles de Ophiomorpha; Miembro 2: alternancia de arenas limosas y conglomerados depositados en un lagoon, conteniendo bioturbaciones de Thalassinoides y superficies de incrustaciones de Fe bien delineadas sobre las capas de conglomerado; Miembro 3: conglomerados rojos de abanico deltaico ordenados según una pronunciada tendencia estrato y granocreciente. El Miembro 1 corresponde a la etapa regresiva de un régimen de nivel alto tardío, mientras que la superficie de erosión en su techo caracteriza el subsecuente límite de secuencia. El Miembro 2 marca el comienzo de una nueva secuencia, con un intervalo basal sin carbonatos que representa el intervalo transgresivo y, por encima, una secuencia condensada con superficies ferruginosas. El Miembro 3 representa el subsiguiente estadio de nivel alto con claras superficies de biselamiento basal (downlap) apuntando a un régimen regresivo acompañado de una progradación de abanicos deltaicos. La sucesión completa de Malalyine podría correlacionarse con el Plioceno inferior español que aflora en la cuenca de Málaga, el cual también está compuesto por margas marinas (Pl-2) sobre las que se disponen discordantemente conglomerados de abanicos deltaicos (Pl-3). Por su edad (Plioceno inferior), estos depósitos se correlacionarían con el Plioceno I de las cuencas béticas orientales

Characterization of the Lago Mare sedimentation (latest Messinian) and the transgression of the beginning of the Pliocene in the Malaga basin (Betic Cordillera)

A stratigraphic unit deposited close to the Messinian-Pliocene boundary is newly discovered in the Malaga basin. This unit mainly consist of alluvial and lagoonal deposits. Paleontological and paleomagnetic data from these deposits and from the overlying sediments indicate that the former were formed in the latest Miocene, thus can be correlated with the so-called Lago Mare deposits. The latest Messinian and lower Pliocene deposits are separated by an erosive surface (latest-Messinian discontinuity) that is related to a relative sea-level fall previous to the earliest Pliocene general floodin

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

The Alpine tectonosedimentary evolution around the Gibraltar arc, and the kinematic of rise of an astenospherical dome since the Jurassique until the Neogene

The peridotites of the betico-rifain internal zone can be explained by the rise again of the subcrustal domein the old Alboran slab. The tectono sedimentary evolution of rifa in internal and external zone, respectively at Mesozoic and Cenozoïc time, may specify the kinematic and age o f this rise again a n d to reconstruct it stage by stageLes modèles géodinamiques qui rapportent les pêridotites des noyaux Sebtides-Alpujarride â un dôme infracrustal, sont confirmés par les données stratigraphiques. Ces dernières permettent plus précisément, de retracer la cinématique de remontée du dôme en question dans le schème d'une faille basale affectant la Croûte et de reconstruire son histoire étape par étape depuis le Jurassique jusqu'au Néogèn

Evidencia de dos generaciones de Mica blanca en el Permo-Trías del Rif septentrional

2 páginas, 3 figuras.-- Trabajo presentado en la XXVIII Reunión de la Sociedad Española de Mineralogía, Zaragoza 16-19 de Septiembre de 2008.El efecto de la presión (P) en el contenido celadonítico de la mica blanca se conoce desde las publicaciones de Ernst (1963) y Velde (1965, 1972), de tal manera que el aumento de P favorece el incremento del contenido celadonítico. Además, dado que la variación de la dimensión del parámetro b de la mica blanca depende de su contenido celadonítico (Guidotti, 1984), son numerosos los trabajos en los que se utiliza el parámetro b de la mica blanca para estimar, de forma semicuantitativa, el rango de P en el cual se formó la mica.Este trabajo ha sido financiado por el Proyecto CGL 2006-02481 (Ministerio de Educación y Ciencia) y por el Grupo de Investigación RNM-199 (Junta de Andalucía).Peer reviewe