3 research outputs found
Geochemical and metallogenetical study of the pegmatites and associated granites from southern Comechingones pegmatitic field, C贸rdoba
El distrito pegmat铆tico Comechingones, ubicado en el faldeo oriental de la sierra hom贸nima, en la provincia de C贸rdoba, involucra pegmatitas gran铆ticas correspondientes a la clase de Elementos Raros, tipo berilo, subtipo berilo-columbita-fosfatos, algunas en transici贸n a la clase muscov铆tica, con mineralizaciones de Be-Nb- Ta-U y minerales industriales. Dos tipos de pegmatitas gran铆ticas han sido descriptas en el sector sur del distrito:
pegmatitas tipo I, con tama帽os que en total pueden alcanzan los 1000 metros de longitud y superar los 50 de ancho, internamente zonadas y portadoras de Be, Nb-Ta y U; y pegmatitas tipo II, de menores dimensiones, no zonadas, ricas en cuarzo de alta pureza, carentes de mineralizaciones metal铆feras, y asociadas espacial y gen茅ticamente con leucogranitos apl铆ticos. En este trabajo se presentan y discuten los datos geoqu铆micos preliminares de ambos tipos de pegmatitas y granitos asociados. Los datos geoqu铆micos obtenidos, apoyados con descripciones de campo y petrogr谩ficas, permiten establecer que las dos tipolog铆as de pegmatitas corresponden a dos eventos magm谩ticos diferentes (muy probablemente diacr贸nicos). El primero gener贸 las pegmatitas tipo I, las cuales de sur a norte presentan un aumento en el grado de fraccionamiento desde pegmatitas poco evolucionadas y sin mineralizaciones de elementos raros, hasta pegmatitas evolucionadas con dep贸sitos metal铆feros de inter茅s econ贸mico. El segundo evento dio origen a las pegmatitas tipo II y a los granitos apl铆ticos, y carece de especializaci贸n metalogen茅tica, evidenciado por los indicadores de diferenciaci贸n magm谩tica sistem谩ticamente inferiores a los de las pegmatitas tipo I y a la carencia de mineralizaciones metal铆feras.The Comechingones pegmatitic field (CPF) is located in the eastern flank of the Sierra de Comechingones, C贸rdoba province. It is composed of granite pegmatites belonging to the Rare-Element class, beryl type, beryl-columbite-phosphate subtype; some of them are transitional into the Muscovite class. Beryllium, Nb, Ta and U deposits, as well as high-quality industrial mineral deposits, are frequently associated with these pegmatites. In the southern part of the CPF two different pegmatite types have been described.
Type I pegmatites constitute large zoned bodies with up to 1000 m long and 50 m thick, and may constitute rare element deposits, whereas type II pegmatites occur as small, unzoned quartz-rich dykes, without metalliferous mineralizations, spatial and genetically associated with aplitic leucogranites. Preliminary geochemical data from both pegmatites types and granites are presented and discussed in this contribution. Geochemical evidences, supported by field and petrographic observations, suggest that the two types of pegmatites identified in the study area represent two different, probably diachronic, magmatic stages. Type I pegmatites display a geochemical gradation in a S-N direction, from barren pegmatites in the south to fractionated pegmatites in the northern part of the study area, and are the lithological product of the first magmatic stage. The second stage lead to the crystallization of aplitic granites and barren type II pegmatites, geochemically less fractionated than type II pegmatites.Centro de Investigaciones Geol贸gica
Geochemical and metallogenetical study of the pegmatites and associated granites from southern Comechingones pegmatitic field, C贸rdoba
El distrito pegmat铆tico Comechingones, ubicado en el faldeo oriental de la sierra hom贸nima, en la provincia de C贸rdoba, involucra pegmatitas gran铆ticas correspondientes a la clase de Elementos Raros, tipo berilo, subtipo berilo-columbita-fosfatos, algunas en transici贸n a la clase muscov铆tica, con mineralizaciones de Be-Nb- Ta-U y minerales industriales. Dos tipos de pegmatitas gran铆ticas han sido descriptas en el sector sur del distrito:
pegmatitas tipo I, con tama帽os que en total pueden alcanzan los 1000 metros de longitud y superar los 50 de ancho, internamente zonadas y portadoras de Be, Nb-Ta y U; y pegmatitas tipo II, de menores dimensiones, no zonadas, ricas en cuarzo de alta pureza, carentes de mineralizaciones metal铆feras, y asociadas espacial y gen茅ticamente con leucogranitos apl铆ticos. En este trabajo se presentan y discuten los datos geoqu铆micos preliminares de ambos tipos de pegmatitas y granitos asociados. Los datos geoqu铆micos obtenidos, apoyados con descripciones de campo y petrogr谩ficas, permiten establecer que las dos tipolog铆as de pegmatitas corresponden a dos eventos magm谩ticos diferentes (muy probablemente diacr贸nicos). El primero gener贸 las pegmatitas tipo I, las cuales de sur a norte presentan un aumento en el grado de fraccionamiento desde pegmatitas poco evolucionadas y sin mineralizaciones de elementos raros, hasta pegmatitas evolucionadas con dep贸sitos metal铆feros de inter茅s econ贸mico. El segundo evento dio origen a las pegmatitas tipo II y a los granitos apl铆ticos, y carece de especializaci贸n metalogen茅tica, evidenciado por los indicadores de diferenciaci贸n magm谩tica sistem谩ticamente inferiores a los de las pegmatitas tipo I y a la carencia de mineralizaciones metal铆feras.The Comechingones pegmatitic field (CPF) is located in the eastern flank of the Sierra de Comechingones, C贸rdoba province. It is composed of granite pegmatites belonging to the Rare-Element class, beryl type, beryl-columbite-phosphate subtype; some of them are transitional into the Muscovite class. Beryllium, Nb, Ta and U deposits, as well as high-quality industrial mineral deposits, are frequently associated with these pegmatites. In the southern part of the CPF two different pegmatite types have been described.
Type I pegmatites constitute large zoned bodies with up to 1000 m long and 50 m thick, and may constitute rare element deposits, whereas type II pegmatites occur as small, unzoned quartz-rich dykes, without metalliferous mineralizations, spatial and genetically associated with aplitic leucogranites. Preliminary geochemical data from both pegmatites types and granites are presented and discussed in this contribution. Geochemical evidences, supported by field and petrographic observations, suggest that the two types of pegmatites identified in the study area represent two different, probably diachronic, magmatic stages. Type I pegmatites display a geochemical gradation in a S-N direction, from barren pegmatites in the south to fractionated pegmatites in the northern part of the study area, and are the lithological product of the first magmatic stage. The second stage lead to the crystallization of aplitic granites and barren type II pegmatites, geochemically less fractionated than type II pegmatites.Centro de Investigaciones Geol贸gica
Geoqu铆mica y metalog茅nesis de las pegmatitas y granitos asociados del sector sur del distrito Comechingones, C贸rdoba
Geochemical and metallogenetical study of the pegmatites and associated granites from southern Comechingones pegmatitic field, C贸rdoba. The Comechingones pegmatitic field (CPF) is located in theeastern flank of the Sierra de Comechingones, C贸rdoba province. It is composed of granite pegmatites belonging to the Rare-Element class, beryl type, beryl-columbite-phosphate subtype; some of them are transitional into the Muscovite class. Beryllium, Nb, Ta and U deposits, as well as high-quality industrial mineral deposits, are frequently associated with these pegmatites. In the southern part of the CPF two different pegmatite types have been described.Type I pegmatites constitute large zoned bodies with up to 1000 m long and 50 m thick, and may constitute rare element deposits, whereas type II pegmatites occur as small, unzoned quartz-rich dykes, without metalliferous mineralizations, spatial and genetically associated with aplitic leucogranites. Preliminary geochemical data from bothpegmatites types and granites are presented and discussed in this contribution. Geochemical evidences, supported by field and petrographic observations, suggest that the two types of pegmatites identified in the study area represent two different, probably diachronic, magmatic stages. Type I pegmatites display a geochemical gradation in a S-N direction, from barren pegmatites in the south to fractionated pegmatites in the northern part of the study area, andare the lithological product of the first magmatic stage. The second stage lead to the crystallization of aplitic granites and barren type II pegmatites, geochemically less fractionated than type II pegmatites