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Browsing by Author "Casquet Martín, César"
Now showing items 1-20 of 33
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Actividad paleo-hidrotermal episódica en la Sierra de Guadarrama (Sistema Central Español): nuevas edades K-Ar y correlación tectónica con la Cordillera Ibérica
(Sociedad Geológica de España, 2010)Episodic hydrothermal alterations in the Sierra de Guadarrama took place between ca. 300 Ma and 10 Ma. New K-Ar ages for hydrothermal minerals have been obtained that along with previous data allow to better constrain ... -
The Aguablanca Cu-Ni(PGE) intraplutonic ore deposit (Extremadura, Spain). Isotope (Sr, Nd, S) constraints on the source and evolution of magmas and sulfides
(Sociedad Geológica de España, 1997)The Aguablanca Cu-Ni(PGE) ore is a case of an intraplutonic ore deposit. It is hosted by mafic and ultramafic cumulates of the Aguablanca Stock, which is part of the larger calc-alkaline Santa Olalla Plutonic Complex of ... -
Albititas metasomáticas y venas de cuarzo en los leucogranitos de Burguillos del Cerro (España). Modelo de evolución hidrotermal basado en el estudio de inclusiones fluidas
(Sociedad Geológica de España, 1996)Slightly peraluminous to metaluminous leucogranites are common as dyke swarms in the Burguillos del Cerro Plutonic Complex. They show superimposed hydrothermal alterations consisting of quartzrich albitites and Au-bearing ... -
Análisis de la fracturación asociada a las alteraciones hidrotermales de tipo Greisen y Episienita en la Sierra del Guadarrama
(Sociedad Geológica de España, 1992)Several episodes of hydrothermal activity have recently been dated in the Sierra del Guadarrama (Caballero et ai, 1992a). Stress analysis based upon the fault sets associated with 300-290 M.a. (Wlodes and greisens) and ... -
Análisis de la fracturación asociada a las alteraciones hidrotermales de tipo Greisen y Episienita en la Sierra del Guadarrama
(Sociedad Geológica de España, 1992)Several episodes of hydrothermal activity have recently been dated in the Sierra del Guadarrama (Caballero et ai, 1992a). Stress analysis based upon the fault sets associated with 300-290 M.a. (Wlodes and greisens) and ... -
Comparación entre el metamorfismo de la Cuenca de Cameros y el de la Cuenca Aurífera de Witwatersrand (Suráfrica). Implicaciones Metalogenéticas
(Sociedad Geológica de España, 1998)The Witwatersrand Coldfield (WCF) and the Cameros Basin (CB) were subjected to widespread fluid flow during metamorphism. Physical conditions reached at the thermal peaks have been estimated at 1 kb and 340°C in the case ... -
Cronología Rb-Sr y K-Ar de diques de la Sierra de Guadarrama (Sistema Central Español)
(Sociedad Geológica de España, 1994)Two calcalkaline granite porphyries, an E-W and a N-S trending one, and three monzonitic dykes striking NE-SW, have been dated. For the first dyke a whole rock Rb-Sr isochrone age of296±3 Ma, i.e. Upper Carboniferous, is ... -
Datación por el método Sm-Nd del filón con F-Ba (Pb-Zn) de la mina San Eusebio (Sierra de Guadarrama, España)
(Sociedad Geológica de España, 1992)S m -N d d a tin g o f F-Ba (Pb-Zn) veins enclosed in a d a m e llite s o f the Spanish C e n tra l System suggests an age of 152± 25 M.a. (Late Jurassic) for this hydrothermal stage. This age supports an unconformity-related ... -
Datación Sm-Nd del metamorfismo en ía Sierra de las Imanas (Sierras Pampeanas Occidentales, Argentina)
(Sociedad Geológica de España, 2003)Sm-Nd garnet geochronology of a migmatite gneiss from the Sierra de las Imanas (Western Sierras Pampeanas) has provided a peak metamorphic age of 464.6 ± 4.5 Ma, i.e., Middle Ordovician, corresponding to the Famatinian ... -
Datación U-Pb SHRIMP de circones detríticos en paranfibolitas neoproterozoicas de las secuencia Difunta Correa (Sierras Pampeanas Occidentales, Argentina)
(Sociedad Geológica de España, 2005)The Neoproterozoic Difunta Correa meta-sedimentary sequence (DCSS) of Western Sierras Pampeanas is a cover to a rejuvenated Grenvillian basement. The Western Sierras Pampeanas are allegedly part of the exotic Precordillera ... -
Dataciones Rb/Sr en el complejo plutónico Táliga Barcarrota (CPTB) (Badajoz)
(Sociedad Geológica de España, 1990)The Plutonic Complex of Táliga-Barcarrota crops out in the core of the Olivenza Monesterio anticline, where it intrudes the Upper Precambrian and Lower Cambrian metasediments; As this Complex is made of a) the Circular ... -
Dating of hydrothermal events in the Sierra del Guadarrama, Iberian Hercynian Belt. Spain
(Sociedad Geológica de España, 1991)Preliminary results are presented on the age of the hydrothermal activity recorded in the Sierra del Guadarrama. They are among the first data generated by the 1<-Ar Spectrometry Lab. of the CSIS-UCM at Madrid. Hydrothermalites ... -
Datos preliminares sobre el metamorfismo de la Sierra de Pie de Palo, Sierras Pampeanas Occidentales (Argentina)
(Sociedad Geológica de España, 1997)The Sierra de Pie de Palo belongs to the Western Sierras Pampeanas. Although still poorly known in detail, the sierra consists of a relatively autochthonous sequence of shelf sediments metamorphosed to low grade (the Caucete ... -
Determinación de las condiciones P-T del metamorfismo Famatiniano (470 - 430 Ma) mediante pseudosección en metabasitas de la Sierra del Espinal (Sierras Pampeanas Occidentales, Argentina)
(Universidad de Huelva, 2012)En las sierras de Maz y El Espinal (La Rioja, Argentina) el basamento polimetamórfico (terreno Maz) registra tres eventos metamórficos: M1 y M2, grenvillianos (entre 1,05 - 1,2 Ga); M3, famatiniano (470 a 430 Ma). En ... -
Edad y origen de la fluorita del yacimiento de La Nueva (Cabalango, Córdoba, Argentina) en base a geoquímica de isótopos radiogénicos (Nd y Sr)
(Sociedad Geológica de España, 1995)The fluorite mineralization from the La Nueva Mine, has a S m-Nd age of 130±19 Ma, and thus must be related to the Lower Cretaceous late -Gondwanic extensional and magmatic event that affected the Sierras Pampeanas Basement ... -
El metamorfismo de la Sierra Chica de Córdoba (Sierras Pampeanas). Argentina
(Sociedad Geológica de España, 1995)Preliminary results on the regional metamorphism of the Sierra Chica (Sierras Pampeanas) are reported. The work is based on a detailed textural and mineral study of high-grade cordierite-garnet metapelitic migmatites of ... -
El origen de los fluidos hidrotermales en el Skarn férrico de Colmenar-Santa Bárbara (Zona de Ossa Morena)
(Sociedad Geológica de España, 1996)Oxygen and carbon isotopes o f the hydrothermal minerals in the Colmenar-Santa Bárbara skarn suggest that fluids of the main hydrothermal stage (grandite/clinopyroxene and actinolite+magnetite) are of likely magmatic origin. ... -
El enjambre filoniano básico intrusivo en el Complejo plutónico Táliga-Barcarrota (Ossa-Morena, Badajoz)
(Sociedad Geológica de España, 1991)Two families ofdykes are distinguished in the Ta/iga-Barcarrota area with directions NW-SE and E-W (the younger one). Chemical affinity is tholeiitic shifting from 01+Hy normative in the first to Q+Hy normative in the ... -
Estructuras distensivas y procesos metamórficos asociados en la Zona de Cizalla de Berzosa
(Sociedad Geológica de España, 1988)Evidence of a late-metamorphic extensional shear activity has been found along the central part of the Berzosa Shear Zone, as evidenced by «S-C» structures. This event could be correlated with a period of regional extension, ... -
Exhumación alpina del bloque morfotectónico Pedriza - La Cabrera (Sierra del Guadarrama, Sistema Central Español): potencialidad de la termocronometría por trazas de fisión en apatitos
(Sociedad Geológica de España, 1995)The principles of Apatite Fission Track Analysis (AFTA), which allows to decipher the time-temperature paths of apatites since their last cooling below about 110°C are given and one example, from a Pedriza - La Cabrera ...
