Estudio de los fluídos hidrotermales asociados a las mineralizaciones de fluorita. Sector Cepitá-Pescadero, Macizo de Santander
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Universidad Industrial de Santander
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Los filones de fluorita localizados en las zonas marginales del Plutón de Pescadero (Macizo de Santander) se formaron en un ambiente epitermal, durante un evento hidrotermal que tuvo lugar en una etapa muy tardía con relación a la formación del plutón. Los análisis microtermométricos en inclusiones fluidas han permitido identificar un fluido compuesto principalmente por H2O+NaCl+CaCl2 con temperaturas de homogenización (Th) entre 110 y 130ºC, responsable de la formación de estas mineralizaciones. La presencia de componentes orgánicos, identificados principalmente en las microfracturas de las fluoritas, solo puede ser explicable en un contexto de deformación frágil, en donde la red de microfracturas favoreció el descenso de hidrocarburos, generados en las rocas cretácicas suprayacentes, en una etapa tardía con relación a la formación de las fluoritas.
The fluorite veins located in the marginal zones of the Pescadero Pluton (Santander Massif) have been formed in an epithermal environment, during a hydrothermal event occurred in a very late stage with respect to the formation of the pluton. The microthermometric anlyses in fluid inclusions have let to identify a fluid mainly compossed by H2O+NaCl+CaCl2, with homogenization temperatures (Th) between 110 and 130ºC, which is responsible of the formation of these mineralizations. The presence of organic compounds, identified principally along microfractures in the fluorites, only can be explained in a fragile deformation context, where the microfractures net favored the descense of hydrocarbons generated in the overlaying Cretacic rocks, at a late stage with respect to the formation of the fluorites.
The fluorite veins located in the marginal zones of the Pescadero Pluton (Santander Massif) have been formed in an epithermal environment, during a hydrothermal event occurred in a very late stage with respect to the formation of the pluton. The microthermometric anlyses in fluid inclusions have let to identify a fluid mainly compossed by H2O+NaCl+CaCl2, with homogenization temperatures (Th) between 110 and 130ºC, which is responsible of the formation of these mineralizations. The presence of organic compounds, identified principally along microfractures in the fluorites, only can be explained in a fragile deformation context, where the microfractures net favored the descense of hydrocarbons generated in the overlaying Cretacic rocks, at a late stage with respect to the formation of the fluorites.
Keywords
Fluorite, fluid inclusions, hydrocarbons, Santander Massif, Fluorita, inclusiones fluidas, hidrocarburos, Macizo de Santander