Examinando por Materia "Sistemas estructurales"

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    Preliminary geothermal conceptual model at Dabeiba - Antioquia, Colombia
    (Universidad EAFIT, 2019) Montoya Londoño, Nicolás; Parra Londoño, Maria Camila; Marín Cerón, María Isabel
    The Dabeiba geothermal system (DGS) corresponds to an extensional character “play”. It is located on the westernmost side of the western mountain range, in the subregion of Urabá, Antioquia-Colombia; where heat flow occurs along the Dabeiba-Pueblo Rico fault system. This structural system puts the Cañasgordas Complex lithology, the Guineal Formation and rocks from the Santa Cecilia-La Equis Complex in contact from East to North. The Chimurro fault, of normal character, raised the geothermal gradient of the area, evidenced in the presence of three hydrothermal sources: the Mohán spring, Chobar spring and Guineales spring. The DGS can be understood from the construction of a conceptual geothermal model based on structural, hydrogeological, hydrogeochemical and thermochronological characterization from the collection of secondary information. Using a semi-distributed water balance model, the potential recharge zones and the relationship with the structural trends of the area were estimated. This was done by identifying the infiltration potential to the West of the area as responsible for the entry of meteoric water into the system, favoring the formation of sodium-chlorinated waters with a tendency of mixing evidenced in the isotopic data. The conceptual geothermal model interprets the heat flow from a deep source associated with isothermal advection processes generated by the normal Chimurro fault, along the Guineal Formation. Through the analysis of geothermometers together with the low temperature thermochronological data ((U/Th) He in apatites) in the sediments of the Guineal Formation, it was possible to classify the DGS as a low enthalpy play with an approximate temperature of 150 ± 30 ° C. Additionally, it is suggested that hydrothermal fluids along the Chimurro fault networks may have been operating from 1.7 to 2 Ma until now.