Thesis Collection
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Browsing by Author "Tornos, Fernando"
Now showing items 1-15 of 15
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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 ... -
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 ... -
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 ... -
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 ... -
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. ... -
Etapas de formación de dolomías masivas del entorno de La Florida-El Soplao, Cantabria
(2009)Dolomitization played a very important role in producing porosity within the Late Aptian shallow marine carbonates hosting the El Soplao Cave and La Forida mine deposit. A detailed petrographic study of samples from a ... -
Geocronología por el método Rb-Sr de las episienitas de la Sierra del Guadarrama, S.C.E., España
(Sociedad Geológica de España, 1992)Rb-Sr dating by internal isochrones of the episyenitea (hydrothermally dequartzified and alkalimetasomaticed granites) from the Sierra de Guadarrama gives an age of 274+-6 M.y., i.e.. Early Permian. The epysienites were ... -
Geología y estructura de la Mina de Río Tinto (Faja Pirítica Ibérica, España)
(2006)The Rio Tinto mining district is regarded as the largest volcanogenic massive sulphide district worldwide, but its geologic and structural setting remains poorly disclosed. The mineralized sequence includes a lower unit ... -
La evolución isotópica de los fluidos ligados a los Sistemas Hidrotermales tardi y postvariscos del Sistema Central Español
(Sociedad Geológica de España, 1996)The late to postvariscan hydrothermal activity of the Spanish Central System extends almost from ca. 300 Ma to the present. It consists of several Independent stages that can be grouped in two different hydrothermal regimes. ... -
La influencia biogénica en la formación de los yacimientos de sulfuros masivos de la Faja Pirítica Ibérica
(Sociedad Geológica de España, 2002)The Tharsis supergiant massive sulphide deposits shows evidence of being formed by exhalative processes on the seafloor. The carbonate-siderite ore is interpreted as a bacterial mound while the bulk of the orebody seems ... -
Las mineralizaciones ferríferas del coto minero San Guillermo (Jerez de los Caballeros, Badajoz, España)
(Sociedad Geológica de España, 2005)Stratoid magnetite and skarn magnetite were mined at the San Guillermo mine district. Structural and textural evidence suggest that they formed by replacement of older rocks in Variscan orogeny times during a protracted process ... -
Mineralizaciones de magnetita asociadas a skarns y bandas de cizalla: La mina de Cala (Huelva)
(2006)The Cala iron deposit has been traditionally regarded as a classic iron skarn developed on Cambrian limestone adjacent to a Variscan monzogranitic stock. Ongoing studies show that the geologic setting is more complex and ... -
Las mineralizaciones estratoides de Zn-Pb de la serie de Vegadeo en la zona de Ponferrada (zona Astur Occidental Leonesa, NO de España)
(Sociedad Geológica de España, 1991)In relationship with the Cambrian limestones of the Ponferrada area three kinds of stratabound Zn-Pb ore deposits are formed in different epochs and conditions. They include diagenetic mineralizations in undisturbed ...
