Geometría de las unidades superiores del relleno holoceno del canal estuarino del Odiel (Huelva, SO de España) (original) (raw)
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Caracterización del relleno Holoceno del estuario del río Deba (Gipuzkoa)
The Holocene at the Cantabrian coast is characterized by a fast sea-level rise. This marine invasion of fluvial valleys sets the beginning of modern estuaries, whose evolution is well recorded based on micropalaeontological and, to a lesser extent, sedimentological data. Thus, the Holocene corresponds to a transgressive period that allows the preservation and study of estuarine depositional sequences and their evolution through time. The sedimentological and micropalaeontological study carried out at the Deba estuary borehole is based on several techniques like X-ray diffraction, characterization of sediments using a binolocular microscope and laser particle analyzer. This has allowed to distinguish five sections in which the rise of the sea level can be observed and also to characterize the dynamics of the estuarine deposits.
Dinámica de formas de fondo en la desembocadura del estuario del Río Piedras (Huelva)
2005
The estuary of the Piedras River is a small and narrow estuary, with a reduced fluvial input and a wide spit in its mouth in whose apex expands a wide system of ebb-tidal deltas. The present work characterizes the dimensions, orientation and sediment grain size in the bedforms distributed on the different subenvironments of these tidal deltas. The study was done by means of direct measurements carried out during tides of different range. On the other hand, measurements of the tidal currents in the interface water-bottom have been carried out to associate the studied forms with the currents that generated them.
Boletín de la Sociedad Geológica Mexicana, 2017
Two different depositional phases can be identified in the Urumea estuarine infill. They were chronologically separated by a long period without sedimentological evidence. The first one, Pleistocene in age (> 43500 BP), is composed of a marsh facies overlaid by fluvio-estuarine facies. This could indicate that the sea level at the time was similar or slightly lower than the present parameter. The later information rules out the coldest stages of the Pleistocene as their origin. On top of the uppermost Pleistocene layer, a Holocene sequence developed which extends from 7040 ± 30 BP (7565-7390 cal. BP) to modern times. In this part of the infill, 3 transgressive pulses can be identified, separated or followed by phases of sea level stabilization or even regression. The first pulse began before 7040 ± 30 BP (7565-7390 cal. BP) and extended to 5200 ± 30 BP (5995-5910 cal. BP). The first regressive pulse took place around the last date, placing the shoreline a few meters below its present position. After 5200 ± 30 BP (5995-5910 cal. BP), a fast sea level rise can be recorded, followed by a stabilisation phase first. Also, a minor regression happened afterwards, which was used by local communities to build two ramps of unknown utility. This regressive pulse was dated 4710 ± 30 BP (4945-4650 cal. BP). A new transgressive pulse took place after 3000 BP extending through a gentle sea level rise to 1240 ± 30 BP (1190-1065 cal. BP). From this date, sea level stabilisation (and maybe a new transgression in historical times) favoured the total infilling of the estuary, which, together with the development of a tombolo on the left bank, induced the formation of a semi-enclosed estuary which can still be observed nowadays.
A detailed structural study has been made in two transects of the Pulo do Lobo Unit, southern Variscan orogen. The lithostratigraphic sequence (from bottom to top, Pulo do Lobo, Ribeira de Limas, and Santa Iría Fms.) is confirmed, and it is demonstrated the unconformity at the base of the Santa Iría Fm. Three phases of penetrative deformation and associated foliations/tectonic bandings are recorded. The deformation style is ruled by folding and flattening, with segregated and folded quartz veins. Two geological cross-sections have been constructed, displaying the geometry of the second and third deformations, of Carboniferous age. Furthermore, a relict foliation exists preserved inside the metapsammitic microlithons, which could be related to the Devonian emplacement of the unit, from a position near a Caledonian deformation area, to the present position between the Ossa-Morena/South Portuguese Zones.
Dólmenes de la cabecera del río Tinto en Huelva y Sevilla
Juan del Puerto-Cáceres y la Vía férrea que unía el ferrocaril de Río Tinto con el de Buitrón. Es un pequeño dolmen de galería trapezoidal con cabecera redonda y túmulo formado por piedras de regular tamaño. Esta muy excavado y carece de algunos ortostatos de la cabecera (figura 2,2).
Revista de Teledetección, 2014
Resumen: Se realiza un seguimiento temporal de eflorescencias salinas en las Marismas del río Odiel, que ocupan el estuario en su desembocadura, con imágenes hiperespectrales Hyperion de archivo. A partir de varias cartografías elaboradas con tratamiento de imágenes, se han realizado estimaciones de variabilidad climática basadas en series minerales conocidas, utilizando respuestas espectrales típicas en vegetación y aguas someras. En este trabajo, se esbozan indicadores espectrales y geomorfológicos susceptibles de un seguimiento repetible con tratamiento de imágenes en las marismas, que permita cuantificar cambios climáticos combinados con la influencia de las mareas, enfocados a estudiar la evolución de las costras salinas que aparecen sobre la superficie de los sedimentos, al retirarse la vegetación y la lámina de agua. En este marco, se presentan cartografías elaboradas a partir de imágenes Hyperion en varias fechas. Se describe el tratamiento preinterpretativo de las imágenes Hyperion, y la secuencia de algoritmos que permiten elaborar las cartografías de sustancias salinas en zonas intermareales. El análisis de una secuencia más amplia de imágenes con condiciones climatológicas distintas, y más amplitud de oscilación mareal, enriquecerá la estimación de parámetros espectrales para el seguimiento rutinario de costras salinas con datos hiperespectrales.
Ostrácodos y contaminación: el estuario del río Odiel(Huelva, SO España)
Se estudian los parámetros físico-químicos e hidrodinámicos que influyen en la distribución de los Ostrácodos del estuario del río Odiel (Huelva, SO España). La contam u acion del~tgua y de los sedimentos, así como la actividad antrópica. concí iciun an la escasisima biocenosis. presente exclusivamente en un subsector muy limitado de este área (zona de Punta Umbría). La tariatocenosis presenta sus rnaxímos en indivídíías y especies en la ni isma zona, si bien el dominio de las intluencias marina o fluvial cond ¡cien a las asociaciones presentes.