Person:
Santisteban Navarro, Juan Ignacio

First Name

Juan Ignacio

Last Name

Santisteban Navarro

Affiliation

Universidad Complutense de Madrid

Faculty / Institute

Ciencias Geológicas

Department

Geodinámica, Estratigrafía y Paleontología

Area

Estratigrafía

Identifiers

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Now showing 1 - 10 of 69

Assessment of the transferred water infiltration in the management of a Mediterranean man-maintained wetland: las Tablas de Daimiel national park (Spain)
(Polish Geological Institute, 2005) Castaño Castaño, Silvino; Martínez Alfaro, Pedro Emilio; Martínez Santos, Pedro; Mediavilla López, Ros; Santisteban Navarro, Juan Ignacio; López Pamo, Enrique
Las Tablas de Daimiel National Park wetlands (Central Spain) have had their main origin in the West La Macha aquifer discharges. Inflows into these wetlands ceased due to the intensive aquifer exploitation. A progresive deterioration of the wetland brought about several attempts of remedial actions by means of building several small dams and pumping groundwater to the Las Tablas basin. The main attempt to preserve these wetlands has been made by means of the inter-basins tranfers. However, a part of these water transfers is lost within the wetland basin due to the infiltration into the underlying aquifer. Infilitration becomes an essential parameter in any study related to the attempts at keemping some water in the basin and, therefore, in the integrated managmeent of the water resources systems related to the wetland. The actual extent of these losses is difficult to quantify due to the poor quality of existing data as well as to the lack of determination of various important parameters. A methodology based on dailiy water balance in the wetland basin allows to assess that losses and can be used for the National Park water management.
Fluvial networks of the Iberian Peninsula: a chronological framework
(Elsevier, 2007) Santisteban Navarro, Juan Ignacio; Schulte, Lothar
Knowledge of the evolution of Spanish fluvial networks has improved during recent years as more river systems have been studied and more geochronological data has become available. However, the chronological framework is a major issue as the range of applications is limited by methodological constraints and spatial coverage is sparse. Integration of ‘absolute’ dating methods with biostratigraphy and palaeomagnetism permits the recent evolution of these river systems to be reviewed. The timing of incision from the Late Neogene to the present varies between the major Iberian fluvial systems, depending on the substrata and tectonic settings. Early Pleistocene and older fluvial sequences in the core areas of the Iberian Peninsula provide a more extensive record of fluvial evolution and are better preserved than the terrace flights in the coastal lowlands. Middle Pleistocene sequences are well developed in most of the major river systems in Iberia, particularly those of the Tajo, Guadalquivir and Aguas River, and frequently represent the principal climatic cycles of that period, although tectonic and sea-level effects can also be seen. For Late Pleistocene to Holocene times, the scheme becomes more complex. Our review suggests that each river system has responded differently to local and regional climate control, glacial and periglacial processes in headwaters in high mountain areas, glacio-eustatic sea-level changes and local and regional tectonic patterns.
Cambios en el almacenamiento de C en el Parque Nacional de Las Tablas de Daimiel (PNTD) en los últimos 1000 años
(Instituto Geológico y Minero de España, 2006) Domínguez Castro, Fernando; Santisteban Navarro, Juan Ignacio; Mediavilla López, Rosa María; Dean, Walter E.; López Pamo, Enrique; Gil García, M. José; Ruiz Zapata, María Blanca
El Parque Nacional de Las Tablas de Daimiel ha sufrido muchas modificaciones a lo largo de su historia, tanto naturales como antrópicas y éstas han afectado de manera diversa al almacenamiento de carbono en el mismo. Para estudiar estas variaciones se ha realizado un análisis del registro sedimentario y de datos históricos de la zona. El registro sedimentario se estudió a partir del sondeo Cigüela 4 al que se le ha realizado un muestreo sistemático de alta resolución (0.7 cm de grosor medio) para analizar su geoquímica y su contenido polínico. Al analizar todos los datos hemos visto que los cambios naturales (asociados al clima) poseen mayores rangos de variación que los antrópicos, no muestran relación con la concentración de CO2 atmosférico y presentan una ciclicidad natural con una amortiguación rápida (décadas) de las variaciones. Sin embargo los impactos antrópicos dependen de la proximidad del impacto y la intensidad del mismo; así el cambio de usos producido a mediados del siglo XIX debido a la desamortización fue un impacto indirecto, de intensidad media y el medio fue capaz de recuperar los valores de almacenamiento normales en menos de 50 años. Sin embargo los episodios de desecación y sobreexplotación del acuífero que alimentaba el Parque Nacional (segunda mitad del siglo XX) fueron impactos directos de alta intensidad, durante los cuales la rápida pérdida de superficie inundada y la salinización del medio, causó una drástica pérdida en la capacidad del ecosistema para almacenar C, de la cual no parece que el ecosistema sea capaz de recuperarse de manera natural. [ABSTRACT] Las Tablas de Daimiel National Park has suffered too many modifications throughout its history, natural as well as anthropic, which have affected the carbon storage in different ways. The study of those variations has been carried out by the analysis of sedimentary record and historical data. The sedimentary record has been studied from the core Cigüela 4. It was sampled with a systematic high resolution method (0.7 cm thickness average) to analyze geochemistry and pollen. The analysis of all data shows that the natural changes (engaged with the climate) have more variation ranges than the anthropic ones, are directly related with the climate and not with the concentration of the atmospheric CO2, showing a natural cyclicity with a fast mitigation (decades) of the variations. In the other hand the anthropogenic impacts depend on the proximity and intensity of the impact. The usage changes produced during the second half of the 19th century were an indirect impact with medium intensity. The environment had the capacity to recover the values of a normal storage in less than 50 years. Nevertheless the dissication and overexploitation of the groundwater (second half of 20th century) were direct and high intensity impacts. These impacts caused a fast lost of the water table and the salinization of the environment. Due to that the ecosystem lost capacity to storage C. The recovering of the normal values by a natural way is difficult now.
Sedimentación mixta (siliclásticoscarbonatada) en lagos someros de baja pendiente con dominio del oleaje. Un ejemplo del Mioceno de la Cuenca del Duero
(Consejo Superior de Investigaciones Científicas, 2003) Mediavilla, Rosa; Santisteban Navarro, Juan Ignacio; Dabrio González, Cristino José; Valero-Garcés, Blas L.
Laeustrine deposits of Tecto-Sedimentary Unit N3 (Mediavilla et al., 1996) outcropping at the centcr of the Duero River Basin contain both, siliciclastic and carbonate formations. The siliciclastic formations were deposited in floodplain (oehre sands and muds), swamp (black and green muds) and lacustrine (green sands and muds) environments, and the carbonates (marls and massive, laminated, and cross-stratified limestones) are of Iacustrine origino Sequential analysis of these deposits reveals that both were coeval and formed in a single lakc. Their occurrence was a function of the distance of the sedimentation area to the siliciclastic sources. This model is ao altemative to their interpretation as an alternation of lithologieally different lakes. Therefore, the sedimentary sequenee can be interpreted as paleogeographically more than climatically controlled. This alternative interpretation urges for the use of correlations based on sequential analysis more than on Iithology for the study of sllch deposits.
Aridity events during the last 4000 years in Western Mediterranean marshes (Almenara and Benicasim marshes, E Spain)
(Elsevier, 2020-04) Mediato Arribas, José Francisco; Santisteban Navarro, Juan Ignacio; del Moral González, Begoña; Dabrio, Cristino J.
Facies and geochemical analysis applied to marsh deposits are useful proxies for the reconstruction of aridity for the last millennia. The comparison of facies and geochemical records among cores from the Almenara and Benicasim marshes allows to identify changes in water level (Si/Al, Al, Ca) and salinity of the feeding waters (Mg/Al, Na/Al, S/Al). These changes, in turn, represent fluctuations in the position of the saline-fresh groundwater boundary, which can be related to variations in sea level and rainfall. For the last 4000 years, three events recording higher salinity conditions (ca. 3.4 ka BP, ca. 3 ka BP and ca. 1.8 ka BP) are noticeable in the record. Comparison to other studies around the Western Mediterranean basin allows us to correlate these events to arid episodes and to identify their forcing mechanisms. These aridity events are correlative to small falls in solar activity and Surface Sea Temperature (SST) during positive North Atlantic Oscillation (NAO) periods. Despite the small magnitude of these changes, the sensitivity of the system amplified the result providing a conspicuous signal.
Depósitos de ápice de abanico (Terciario de la Cuenca del Tajo, Madrid): sedimentología y controles sedimentarios
(Sociedad Geológica de España, 1999) Santisteban Navarro, Juan Ignacio; Dabrio, Cristino J.; Mas Mayoral, José Ramón
The topmost alluvial deposits that outcrop adjacent to Central System igneous rocks are arranged in two units with particular internal architecture. The lower unit consists of ten bodies laterally disposed and bounded by concave erosional surfaces. These bodies record both viscous and f1uidized flows corresponding to channelized debris-flows, torrential flows and single channel fluvial deposits. This unit is interpreted as entrenched deposits at the head of the fan at the outlet of the catchment area. The c1ast-supported gravel and boulder upper unit is arranged in near tabular bodies with erosional bases and internal smaller, single channels and records the final stages of fan development when apex trench was buried and sheet-flows developed. Lateral migration of bodies in both units record a stable tectonic setting and a slowly-rising or near-equilibrium base-level, interpreted as the final stages of fan development in a almost-filled basin.
The Duero Basin: a general overview
(Cambridge University Press, 1996) Santisteban Navarro, Juan Ignacio; Mediavilla López, Rosa María; Martín Serrano, Ángel; Dabrio, Cristino J.; Freend, Peter F.; Dabrio, Cristino J.
The Duero basin occupies a large area in the north-west of the Iberian Península. It has ao approximately quadrangular shape, and three of its four corners are the sites of distinctive sub-basins that extend outwards from the main basic. The different margins of lhe sub-basins and the main basic tend to have distinctive histories of tectonic and sedimentary evolution.
Loss on ignition: a qualitative or quantitative method for organic matter and carbonate mineral content in sediments?
(Springer Netherlands, 2004-10) Santisteban Navarro, Juan Ignacio; Mediavilla López, Rosa María; López Pamo, Enrique; Dabrio, Cristino J.; Ruiz Zapata, María Blanca; Gil García, M. José; Castaño Castaño, Silvino; Martínez Alfaro, Pedro E.
Since the publication of the paper of Dean (1974), loss on ignition (LOI) has been widely used as a method to estimate the amount of organic matter and carbonate mineral content (and indirectly of organic and inorganic carbon) in sediments. The relationships between LOI at 550 ºC (LOI550) and organic carbon (OC) content and between LOI at 950 ºC (LOI950) and inorganic carbon (IC) content are currently accepted as a standard. However, the comparison of 150 analyses of samples of diverse lithologies, collected from a single core, reveals that these relationships are affected by sediment composition (presence of clays, salts, and the variable content of organic carbon). This results in an incremental error on the estimation of carbon content from LOI values that invalidates the use of LOI values as a quantitative method for estimating carbon content. Conversely, the general trends of LOI550 and LOI950 show a good correlation with carbon content (both organic and inorganic) allowing use of LOI as a qualitative test for carbon content. Similarly, in our case, LOI at 105 ºC (LOI105) is a good qualitative proxy for the trends in gypsum content.
La estratigrafía en la modelación matemática de los acuíferos. El caso del embalse subterráneo de Torrevieja (Alicante)
(Instituto Geológico y Minero de España, 2007) Mediavilla López, Rosa María; Murillo Díaz, José Manuel; Santisteban Navarro, Juan Ignacio
En el presente artículo se muestra el análisis estratigráfico realizado en el embalse subterráneo de Torrevieja, a partir de una serie de sondeos realizados en el mismo, para desvelar las incertidumbres surgidas en el modelo conceptual del acuífero. Éstas hacían referencia a la posible conexión con el mar de este acuífero, pues los datos hidroquímicos, que se tenían, no explicaban claramente ésta. Inicialmente se realizaron dos sondeos, que dieron lugar a tres posibles hipótesis, en función de donde se situó en el pasado la línea de costa, que barajaban la posibilidad de que dicho acuífero no estaba conectado con el mar, que existía conexión con el mar o que esta conexión era parcial, por lo que no concretaban la incertidumbre inicial que se planteaba sobre el modelo conceptual relativa a las altas concentraciones de cloruros que se presentaban en zonas relativamente alejadas de la costa, por lo que la contaminación por este ión podía ser debida a otras causas antrópicas o naturales distintas de la intrusión de agua de mar. Al objeto de poder definir un único modelo conceptual se perforaron otros cinco sondeos de investigación hidrogeológica, cuya interpretación paleogeográfica, que se presenta en este artículo, concreta un único modelo conceptual de funcionamiento del acuífero compatible con la existencia de intrusión marina. [ABSTRACT] The current article shows the stratigraphic analysis carried out in Torrevieja underground reservoir from its multiple wells, in order to reveal the uncertainties arisen from the conceptual model as a consequence of hydroquemical data, whose study was not able to determine the connection between the aquifer and the sea. Taking into account the coastal line which was defined in the past, two first wells were made in the aquifer, giving rise to three possible hypothesis: its complete connection with the sea, the total absence of connection with it or a partial connection between both of them. Under these circumstances, the initial uncertainty posed, further to the cause of high chloride concentrations detected in some zones located far away from the sea, could not be specified, and this was the reason why it was necessary to consider other causes for this kind of pollution instead of the connection with the sea, either the anthropic or another natural one. Lastly, the paleogeographic interpretation of five other investigation wells were made in the aquifer with the purpose of defining an only conceptual model, compatible with the existence of seawater intrusion.
Cartografía de formaciones geológicas litológicamente similares en zonas llanas cultivadas
(Universidad de las Palmas de Gran Canaria, 1998) Riaza García, Asunción; Mediavilla López, Rosa María; Santisteban Navarro, Juan Ignacio; Cantón Garbín, Manuel
Los estudios espectrales de laboratorio en el visible y el infrarrojo cercano (400- 2500 nro) sobre muestras de rocas de distintas formaciones geológicas detríticas siliciclásticas en una cuenca sedimentaria terciaria, sugieren que la proporción de carbonatos y su composición, así como la de la fracción arcillosa y la presencia de óxidos e hidróxidos de hierro, es responsable de las sutiles diferencias en las respuestas espectrales de las mismas. La presencia de cemento carbonatado en areniscas y conglomerados con cantos metamórficos y de costras carbonatadas intrasedimentarias facilita la expresión de distintas unidades en imágenes. Dos alteraciones ferruginosas cronológicamente sucesivas pueden distinguirse en las imágenes superpuestas a los demás acontecimientos geológicos. [ABSTRACT] The presence of carbonate of different composition, clays and iron oxides and hydroxides are responsible for the subtle differences on the spectral response of various geological units of tertiary age lithologically homogeneous, shown by laboratory spectra in the visible and the nearinfrared. Carbonate cernent in sandstones and conglomerate with metamorphic boulders, and intrasedimentary carbonate crusts favour the express ion of different units on the imagery. Two chronological stages of late fron alteration can be distinguished overlying prior geological events.