Saturnino Lorenzo Álvarez

Saturnino Lorenzo Álvarez
University of Castilla-La Mancha · Geological and Mining Engineering

PhD

About

79
Publications
17,258
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838
Citations
Additional affiliations
September 2003 - present
University of Castilla-La Mancha
Position
  • T.U.
Education
September 2003 - March 2015
September 1974 - June 1979
University of Oviedo
Field of study
  • Geology

Publications

Publications (79)
Article
Full-text available
INTRODUCCIÓN El yacimiento de El Quinto del Hierro, localizado entre Almadén y Almadenejos, corresponde a una mineralización filoniana de Pb con altos contenidos en Ag, que fue explotado en época romana y, a finales del siglo XVIII, por la Sociedad Vasco Montaña, permaneciendo abandonado desde el cese de estas explotaciones en el siglo XIX. Desde e...
Article
Full-text available
INTRODUCCIÓN El sector suroccidental de la provincia de Ciudad Real incluye, desde el punto de vista geológico, los sinclinales de Almadén y Guadalmez y el anticlinal del Valle de Alcudia. Es, además, un área caracterizada por la presencia de numerosas explotaciones mineras de elementos metálicos, todas ellas abandonadas en la actualidad. En concre...
Conference Paper
Full-text available
(Talk) Ecological diversification of early planktonic ostracods in the upper Silurian Vincent Perrier*, Gwendal Perrichon, Félix Nesme, Saturnino Lorenzo & Juan Carlos Gutiérrez-Marco The Silurian myodocope ostracod fauna has been recognized for several decades as including the pioneer planktonic component of the group. Although the mid Silurian...
Article
Full-text available
Continental lithosphere is modified over eons in response to large-scale tectonic processes, such as rifting and collisions. The lithospheric mantle beneath central Iberia was affected by multiple Neoproterozoic to Cenozoic events including two orogenic cycles. However, the details of this evolution, and the relationship of the Iberian lithosphere...
Article
In the Central Iberian Zone, the Cadomian orogenic collapse is represented by chaotic megabreccias, olistostromes and mélange deposits reflecting a drastic change from slope-related deposits, fed by denudation of the Cadomian arc, to offshore-dominant settings episodically punctuated by phosphogenetic processes. In the Ibor and Alcudia anticlines,...
Conference Paper
Full-text available
This work presents the preliminary results of geochemistry of mafic intrusions (diabase dykes) and their relationship with antimony mineralization in the Central-Iberian Zone (Variscan Belt). Two different areas were studied, the Almadén (Al) and the San Antonio (SA) areas. Both macroscopic and microscopic observations show that mafic dykes are mai...
Conference Paper
Full-text available
Origin and significance of the antimony mineralization associated to mafic intrusions in the Iberian Zone and the Central Armorican Domain. In the Central Iberian Zone (CIZ) and its French counterpart, the Central Armorican Domain (CAD), widespread swarms of mafic dykes with various ages and compositions are known. Indeed, numerous mafic events are...
Conference Paper
Full-text available
The geochemical similarities between Hg and Sb (along with W and As), have produced ore deposits in which both elements are present. In the present work we investigate the relationships between the Sb deposits of the Guadalmez synclinal and the Hg deposits of the Almadén synclinal, separated only 8 kilometres. To accomplish this porpoise a regular...
Conference Paper
Full-text available
Traditionally, prospectivity models were designed using approaches mainly based on expert judgement. These models have been widely applied and they are also known as knowledge-driven prospectivity models (see Harris et al. (2015)). Currently, artificial intelligence approaches, especially machine learning models, are being applied to build prospect...
Conference Paper
Full-text available
Antimony (Sb) is a valuable element, exploited for diverse applications including flame retardants, munitions, batteries, glasses, and industry for diodes. However Sb is also a toxic metalloid, often associated with other harmful elements (arsenic, lead, mercury…) in mining sites. The biogeochemical behavior of Sb remains poorly documented, and dat...
Conference Paper
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Castilla-La Mancha (CLM), located in South-Central Spain, is a region of some 80,000 Km 2 centered in agricultural and livestock activity, being the first major producer of wine and second of olive oil in Spain (after Andalucía), and an important producer of sheep cheese and lamb meal. Besides, the region has supported an important metallic mining...
Article
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El objetivo principal del proyecto será la caracterización geoquímica de los suelos de Castilla-La Mancha. La consecución de este objetivo principal permitirá determinar la variabilidad de los elementos mayores y traza y de sus contenidos, según la litología de la Región, permitiendo definir niveles genéricos de referencia, así como identificar zon...
Article
Full-text available
La elaboración de mapas prospectivos, también conocidos como cartografía de la prospección mineral (en inglés Mineral Prospectivity Mapping, MPM), para ofrecer una herramienta de apoyo al trabajo de geólogos, ingenieros de minas y otros especialistas de áreas afines, se ha realizado tradicionalmente confiando en un equipo de expertos. Así, los mapa...
Article
Full-text available
The first record of a Devonian graptolite from the Paleozoic of the Cantabrian Mountains is here reported, also being the first occurrence of benthic graptolites for this period in southwestern Europe. The studied horizon is located near the top of the Moniello-Santa Lu-cía Formation and has been assigned to the lower Eifelian by means of conodonts...
Article
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Lower Paleozoic fossils are scarce in the Obejo-Valsequillo Domain of the southwestern Iberian Massif. In this note we add new records for Middle Ordovician trilobites, brachiopods and molluscs of three rarely cited localities, which expand the paleontological record of the region and clarify the stratigraphy and age of some of the assemblages. The...
Article
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Fossiliferous upper Silurian strata have been identified in two abandoned open-pit mines within the municipality of Hinojosa del Duque (province of Cordoba). The fossils from Las Angosturas mine are preserved in argillaceous limestones and include orthocone nautiloids, bivalves, scyphocrinoids, phyllocarids, ostracods and rare graptolites, the latt...
Article
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An updated stratigraphic subdivision of the Ediacaran and Terreneuvian in the Alcudia valley and the Toledo Mountains, Central Iberian Zone, is documented here. The Lower Alcudian-Domo Extremeño Supergroup is subdivided, from bottom to top, into the conformable Guadiana (La Coronada and Sta. Mª de Zújar formations) and Campanario (Botija, Monroy an...
Chapter
Full-text available
Progressive opening of the Rheic Ocean led to the drifting away of one or several ribbon terranes, generally ascribed to Avalonia, and inaugurated a passive margin stage on the newly formed margin of NW Gondwana. In Iberia, which remained on the Gondwanan side of the ocean, the rift to drift transition is recorded in the Ossa Morena Zone in latest...
Poster
For several decadas now, the Silurian myodocope ostracod fauna has been recognized as the first planktonic component of the group. Although the colonization event during the middle Silurian (Wenlock-Ludlow) is becoming well documented all around the world, the evolution of this fauna during the late Silurian (Pridoli) still remains unstudied. Here...
Article
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Se presenta el hallazgo de un gran afloramiento cuarcítico situado al este de Fontanarejo (Ciudad Real), afectado por una intensa bioturbación a cargo del productor de Daedalus desglandi (Rouault). La localidad se sitúa en los niveles inferiores de las “Capas Intermedias” (Arenigiense inferior) y el icnofósil corresponde a una excavación vertical c...
Presentation
Full-text available
Se presenta la historia poco conocida de los fósiles encontrados en el interior de las minas de Almadén desde mediados del siglo XIX, y cómo éstos influyeron en el conocimiento y datación de los materiales geológicos que conforman el yacimiento de mercurio. El registro paleontológico se desglosa en un icnofósil ordovícico procedente de un bloque en...
Presentation
Full-text available
Se actualiza el registro paleontológico del Ordovícico (trilobites, graptolitos, braquiópodos, equinodermos, moluscos, conodontos) en el Dominio de Obejo-Valsequillo) representado en cinco localidades fosilíferas. Dos de ellas (sur de Alcaracejos y noreste de Belmez) corresponden a la llamada “Unidad Parautóctona” y las tres restantes (Campillo de...
Poster
Full-text available
The pandemic brachiopod Hirnantia fauna characterizes the lower part of the Hirnantian (Hi1 Stage Slice of the uppermost Ordovician Global Stage). In the Moroccan Anti-Atlas, its occurrence in glacially-related successions allowed contrasting the onset of several Late Ordovician glacial events. In the Central Anti-Atlas, the Hirnantian is lithostra...
Article
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Resumen: La nuevas divisiones de la escala global del Sistema Ordovícico, con excepción de los pisos Tremadociense e Hirnantiense, son difíciles de aplicar en la Península Ibérica, pues sus estratotipos de límite radican en facies y faunas de aguas profundas, desconocidas en las plataformas someras y de paleolatitud elevada del ámbito peri-gondwáni...
Article
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The regional chronostratigraphy of the British Ordovician, established mainly for shelly facies, is hard to correlate in the Iberian Peninsula, especially after the separation and drift of Avalonia from Gondwana by the early Middle Ordovician. The same applies to the Ordovician global scale, whose stratotypes involve deeper-water facies and faunas...
Article
Full-text available
ABSTRACT: The regional chronostratigraphy of the British Ordovician, established mainly for shelly facies, is hard to correlate in the Iberian Peninsula, especially after the separation and drift of Avalonia from Gondwana by the early Middle Ordovician. The same applies to the Ordovician global scale, whose stratotypes involve deeper-water facies a...
Article
Full-text available
Usagre (Badajoz, SW Spain) mercury mine was active for an undetermined time until its closure in 1971. The ore exploited in this mine was cinnabar (red HgS), and metallurgy was also performed locally by means of primitive furnaces of the Bustamante type. Since the closure of the mine, reclamation measures have not been carried out at the site, and...
Article
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Silurian graptolites form the Central-Iberian Zone are often preserved as flattened moulds in black shales, but in some cases rhabdosomes can maintain a part of its original relief, and even can appear three-dimensionally preserved. The majority of these casescan be related to an early pyritisation of the periderm favoured by bacterial activity und...
Article
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RESUMEN La región de Almadén se integra en la Paleontología mundial del Paleozoico a mediados del siglo XIX, tras el descubrimiento de importantes yacimientos fosilíferos de los sistemas Ordovícico, Silúrico y Devónico, que permi-tieron establecer correlaciones con el Macizo Armoricano francés y la región de Bohemia (República Checa). Se trata de u...
Article
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Los yacimientos de mercurio del Distrito minero de Almadén representan una singularidad mundial, al ser el único caso de un metal, el mercurio (Hg), que ha sido obtenido en una tercera parte de su producción mundial a partir de un solo yacimiento. El Distrito está formado por una serie de yacimientos de cinabrio (HgS), entre los que la mina de Alma...
Article
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. The Almadén mining district includes the World's largest mercury mine, exploited in a practically continuous way since Romans times until the closure of all the mines and metallurgic dependencies at the 1990's and the 2000's. In this work we summarize the most relevant informa-tion about the mining geology of the district, as well as the history...
Chapter
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The mercury deposits hosted in the Almadén syncline constitute the Almadén mining district, and they represent a worldwide singularity, being the only case of a metal supplied in one third of total historic production by a single deposit, the Almadén mine. The District comprises a number of cinnabar (HgS) deposits, among which the Almadén mine is t...
Conference Paper
Since its discovery by Dolf Seilacher in 1970, “Cruziana” almadenensis constitutes the nominal icnotaxon of a problematic group attributed to Cruziana, but whose trace markers were possibly chelicerates rather than trilobites. The original material of this ichnospecies comes from beds of early Sandbian age located in the upper part of the “Canteras...
Chapter
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Descripción de las mineralizaciones de mercurio de Almadén (Ciudad Real, España)
Conference Paper
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The Almadén mining district (Central-Iberian Zone of the Iberian Massif) constitutes the largest geochemical mercury anomaly in the Earth's crust. Mercury ore bodies are hosted by uppermost Ordovician, Silurian and Upper Devonian sedimentary and volcanic rocks. In the Almadén-type mineralization, cinnabar and native Hg stratabound orebodies are dis...
Chapter
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La Península Ibérica reúne los afloramientos más extensos de rocas ordovícicas y silúricas de Europa (Fig. 1), localizados en su mayor parte en el Macizo Hespérico (= Macizo Ibérico + afloramientos orientales de la Cordillera Ibérica). Dentro del mismo y desde finales de 2006, un equipo hispano-portugués trabaja en la caracterización de puntos de r...
Article
We present data from an early reconnaissance survey (stream sediments, soil, and water Hg chemistry; plants and water crustaceans Hg intake) of the Almadén district (central Spain), that was carried out to establish the potential environmental hazards derived from the anomalous mercury concentrations measured in this realm. The Almadén mercury dist...
Article
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Almost no environmental data on mercury distribution and speciation in soils have been published so far for the Almadén mining district (central Spain), despite its huge size and historic importance. The mercury distribution in soils of the district reveals the existence of high and extremely high mercury values (up to ∼9000 ppm Hg). The Hg-thermod...
Article
Full-text available
Almost no environmental data on mercury distribution and speciation in soils have been published so far for the Almadén mining district (central Spain), despite its huge size and historic importance. The mercury distribution in soils of the district reveals the existence of high and extremely high mercury values (up to f9000 ppm Hg). The Hg-thermod...
Article
Full-text available
In this study, a fracture index (FI) distribution method of geostatistical modelling and simulation in 2-D is used to characterize quantitatively the fracture system developed in the Fontanosas granodioritic pluton (Southern Central-Iberian zone of the Iberian Hercynian Massif). The fracture index (Fl, m4 units) is a measure of the fracture density...
Article
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The Nuevo Entredicho deposit contains the richest concentration of mercury in the Almadn district, locally grading as much as 45% Hg. This ore deposit is hosted within an alkaline, conically shaped diatreme, about 150 m in diameter, which was subsequently filled with phreatomagmatic breccias. The diatreme cuts an Ordovician to Silurian clastic sedi...