Ángel Sánchez bellón

Universidad de Cádiz | UCA · Department of Earth Sciences

The degradation of groundwater quality due to nitrate is a widespread issue in heavily agricultural areas and a major concern for public health. Improving knowledge of the intrinsic vulnerability of aquifers with respect to the actual contamination is crucial for adequate water management and for complying with the European directives aimed at prot...

Soil organic matter (SOM) humification and changes in molecular structures of humic acids (HAs) induced by long term practices management over soil profile have been scarcely investigated in arid climates. This study aims to assess SOM humification, HAs molecular structures changes over soil profiles induced by long- term tillage practices under ar...

Novel data-acquisition technologies have revolutionized the study of natural systems, allowing the massive collection of information in situ and remotely. Merging these technologies improves the understanding of complex hydrological interactions, such as those of wetland–aquifer systems, and facilitates their conservation and management. This paper...

The ancient Osiris Temple at Philae/Aswan, also known as Abaton, was considered one of the most sacred and mysterious temples in Egypt. In 1960, UNESCO rescued Philae temples because the rise of the water level after the construction of the Old and New Dam of Aswan caused the submergence of all temples underwater. Rescue camping was performed to pr...

This study aims to assess the effect of intensive tillage on the humification degree, variations in molecular structures of HAs and physic-chemical properties along soil profile of an arid soil in southeastern Tunisia. Methods: Soil profiles from fields tilled for 100 years were compared with profiles from zero-tillage soils. Soil samples were tak...

Soil organic carbon (SOC) plays an important role in the global C cycle, as well as in the maintenance and improvement of the soil quality. Over time, special attention has been paid to it in the study of the SOC reserves worldwide; however, reduced attention has been given to assessing the spatial patterns of SOC stock (SOCS) in semi-desert ecosys...

Enhancing soil organic carbon (SOC) amount is important for sustainable crop production. Soil organic carbon depends on practices of soil management such as tillage. Much attention has been paid to the study of SOC stocks in several climates, although studies on arid soils such as Arenosol and Calcisol are still lacking. To identify efficient soil...

We are celebrating the 10th anniversary of the Cadiz Geolodays, dedicating this edition to show various aspects of the geology of our capital. We begin with an introductory lecture about the geological setting and its evolution. After, at different stops a walk will take us to the few outcrops of the rocky substrate on which the city is located. Th...

In less than two decades, UASs (unmanned aerial systems) have revolutionized the field of hydrology, bridging the gap between traditional satellite observations and ground-based measurements and allowing the limitations of manned aircraft to be overcome. With unparalleled spatial and temporal resolutions and product-tailoring possibilities, UAS are...

This study presents a novel review of seven case histories of Andalusian reservoirs (Southern Spain) affected by different hydrological and hydrogeological problems that have led to severe malfunctions. The failures reported are related to (i) water quality degradation due to salinization and acid mine drainage, (ii) leakage in karstified terrains,...

Reversing the chemical and quantitative impacts derived from human activity on aquifers demands a multidisciplinary approach. This requires, firstly, to update the hydrogeological knowledge of the groundwater systems, which is pivotal for the sustainable use of this resource, and secondly, to integrate the social, economic and administrative realit...

Field video-guide for the "Geolodía Cadiz 2020". A geological field trip video-guide to show the geological point of interest in the dawntown of Cadiz

Today, coastal cities worldwide are facing major changes resulting from climate change and anthropogenic forcing, which requires adaptation and mitigation strategies to be established. In this context, sedimentological archives in many Mediterranean cities record a multi-millennial history of environmental dynamics and human adaptation, revealing a...

Guía Geológica del Geolodía Cádiz 2018. Excursión dedicada a conocer los aspectos geológicos de las salinas de la provincia de Cádiz, tanto costeras como de interior.

The main objective of this study is to evaluate the quality of four soils with distinct uses and managements (pasture, cereal, chestnut and oak) to check whether their use is appropriate and propose improvements. The investigation took place at Vilar de Ossos, a sector of Montesinho Natural Park in northeast Portugal. Results were obtained from fie...

Wetlands are sensitive and complex systems whose conservation is a priority. For the correct understanding of their hydrological dynamics, it is necessary to determine the different elements of the water budget and, in particular, the geometry of the wetland basin in order to estimate the variations in storage capacity. This paper presents a novel,...

Se han seleccionado dos sucesiones (Valentín, X.V1: 75.50 m de espesor, y Barranco de Cavila, X.Kv2: 67.70 m de espesor) constituidas por materiales depositados en medios pelágicos, y pertenecientes al Subbético de la Cordillera Bética. Ambas están bien datadas mediante ammonites (Aguado et al., 1997, 2014; Company et al., 2003) y en su conjunto co...

ABSTRACT TITLE, 13 PT. BOLD, TIMES NEW ROMAN NAME SURNAME (1), NAME SURNAME (1), NAME SURNAME (2)*, (11 POINT) (1) Author’s affiliation, City, Country (9-point), (2) Author’s affiliation, City, Country (9-point) Following is a description of abstract submission format and guideline for 16ICC, Granada, Spain, July 2017. You can directly use this te...

Guía geológica de campo

Mineralogical and Scanning Electron Microscope (SEM) analysis was used to study heavy mineral grains present in recent marine sediments from Cadiz Bay (SW Spain) and the adjacent continental shelf, in order to establish the provenance of sediments and to determine physical and chemical processes which took place during their depositional history. S...

En el presente trabajo se describen las actuaciones dirigidas a la implementación y utilización con fines docentes de un laboratorio natural de Hidrogeología junto al Campus de Puerto Real de la Universidad de Cádiz, en el Parque Metropolitano Marisma de Los Toruños y Pinar de La Algaida. Esta zona protegida se encuentra a su vez ubicada dentro del...

La región de Chiquimula, situada al sureste de la República de Guatemala, está caracterizada por emplazarse en un corredor de clima seco que la hace inviable para los cultivos tradicionales. Geológicamente, la zona presenta amplias áreas en las que afloran rocas ígneas intrusivas que se conocen como el Plutón de Chiquimula. Este estudio pretende ca...

El objetivo principal de este trabajo es evaluar la calidad de cuatro suelos con usos y manejos diferentes (pasto, cereal, castañar y robledal) para comprobar si su uso es el adecuado y proponer mejoras. Se ha realizado en Vilar de Ossos, un sector del Parque Natural de Montesinho, noreste de Portugal. Los resultados se consiguieron en campañas de...

Chiquimula region, located in the southeast of the Republic of Guatemala, is characterized by be emplaced in a corridor of dry weather that makes it unfeasible for traditional crops. Geologically, the area has large areas outcropping intrusive igneous rocks known as Chiquimula pluton. This study aims to characterize geochemically and taxonomically...

The main objective of this study is to evaluate de quality of four soils with distinct uses and managements (pasture, cereal, chestnut and oak) to check whether their use is appropriate and propose improvements. The investigation took place at Vilar de Ossos, a sector of Montesinho Natural Park, Northeast of Portugal. Results were obtained from fie...

In this study, we reconstruct the recent environmental evolution of the inner Cadiz Bay using sedimentary records reaching back as far as AD 1700. We report lithological descriptions of the sediments and extensive mineralogical and geochemical analyses. An extraction technique that identifies different Fe phases provides an assessment of diagenetic...

Geologic field trip guide for Geolodía 16 Cádiz

Glycymeris insubrica is a marine bivalve mollusk from subtropical waters (Sivan et al., 2006), that respond rapidly to the environmental changes. Its distribution covers both the Mediterranean Sea and Atlantic Ocean (Martins et al., 2014). They live in sandy-mud subtidal bottoms, between 10 and 30 m depth. They usually live until around 20 years wi...

Quantitative phase analysis (QPA) of clayey materials using X-Ray diffraction data has always been a challenge. While quantitative methods based on Rietveld analysis offer excellent results for non-clay minerals, they become problematic when high crystallochemical and order degree variations are present in the phases, as is the case of most clay mi...

Geologuía para el Geolodía 2015 Cádiz

El 10 de mayo de 2014 se celebró la cuarta edición de Geolodía en la provincia de Cádiz. La excursión se presenta bajo el título “Agua y Karst entre Ubrique y Villaluenga del Rosario”. En ella se pretende mostrar a un público lo más amplio posible, las facetas de la geología que muestran las relaciones del entorno con el agua y el karst. El karst e...

Plio-Pleistocene outcrops from Cadiz coast (SW Spain) have been studied with the goal to establish the conditions that characterized the sedimentary infilling in southern sector of the Guadalquivir Basin. Pliocene deposits show bioclastic lithofacies with warm-water fossils, whereas Pleistocene sediments have a lower fossil content. Between Pliocen...

Geologic field trip guide for the Geolodía 2013 Cádiz

Geologuía del Geolodía 2012 Cádiz

Geologuía del Geolodía 2011 Cádiz

The study zone is geologically very complex and corresponds to the western limits of the Betic Cordilleras (SW Spain); materials from the Triassic to Holocene are found here. This study demonstrates that most of the surface textures seen on quartz are present on the seven selected heavy minerals. SEM analysis of heavy-mineral grains reveals that ce...

The study of recent sedimentation in the Gulf of Cadiz continental shelf (SW Europe) is of interest due to its proximity to the Strait of Gibraltar, where the Atlantic and Mediterranean waters are interchanged and the Western Mediterranean Alpidic Orogen closes through the Gibraltar Arch. The existence of relict materials hinders the distinction of...

Studies accomplished with the objective of establishing the sedimemary bypassing model between continent and continental shelf in south and north sectors of the Gulf of Oadiz, has been based on rhe recognition of the recent sedimentary facies of sea floor and geological formations located in river basin. The main object is the determination of the...

A mineralogical study and multivariant geochemical analysis have been carried out to determine the sedimentation processes and the influence of surrounding rocks on sediments. Analyses were made on the clay fraction of sediments and on bulk samples of rocks from nearby reliefs in the Sorbas Basin (SE Spain). Source rocks were identified by statisti...

A mineralogical study and multivariant geochemical analysis have been carried out to determine the sedimentation processes and the influence of surrounding rocks on sediments. Analyses were made on the clay fraction of sediments and on bulk samples of rocks from nearby reliefs in the Sorbas Basin (SE Spain). Source rocks were identified by statisti...

A typical deposit of multicycle quartz arenites of considerable economic significance located in Arcos (SW Spain) has been studied to establish the provenance of the grains and their stages of sedimentary evolution. The quartz grains were studied by SEM and the composition of the sand determined by modal analysis of the heavy and light minerals. Th...

Se han analizado los principales minerales y rocas industriales del Neogeno de la zona occidental de la provincia de Cadiz (arenas silíceas, arcillas industriales y especiales, areniscas, arenas y gravas). En dicho analisis se ha tratado la geologia de los yacimientos, metodos de extraccion, tipos de tratamiento y problematica ambiental. Tambien se...

RESUMEN Se estudian diversos niveles de terrazas del actual curso del río Guadale-te, con objeto de establecer criterios de diferenciación entre los depósitos, ha-biéndose encontrado variaciones mineralógicas y morfoscópicas entre los ni-veles bajos y altos. Aunque las asociaciones mineralógicas de las fracciones arcilla y pcsada son similares en a...

The analysis of quartz grain surface features from several sandy deposits of the Guadalete River basin-Guadalete terraces, Miocene calcarenites and Aljibe sandstones-have yielded data of considerable value in the study of the provenance of these materials. The majority of the quartz grains of the Miocene calcarenites present the same primitive surf...

The geochemistry of the < 2 µm fractions of the Mio-Pliocene sediments and the bulk sample of the surrounding metamorphic rocks was studied in arder to characterize the geochemical environment during the sedimentation and to trace the influence of the surrounding rocks on the sediments. After making the relationships among the chemical elements an...

The origin and history of sedimentary rocks can be deciphered from the trace elements in their clay minerals. The inheritance from weathering profiles is detected by the analogy in trace-element amounts of the < 2-μm fractions of the sediments and the presumed parent rocks. The paleoenvironmental conditions are printed in the clay fraction by speci...

El acuífero de Turón-Peñarrodada se localiza al W de Berja (Almería) y está constituido por materiales carbonatados pertenecientes al Manto de Lújar. En la actualidad, la principal recarga procede del embalse de Benínar; su drenaje se efectúa a través de las Fuentes de Marbella. El SGOP ha realizado varias perforaciones en dicho acuífero al objeto...