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Ore-controlling structures and geostatistical determination of ore-shoots in shear zone hosted lode gold type deposits, El Bagre-Antioquia, Colombia
Controles estructurales de mena y determinaciones geoestadísticas de zonas de alta ley en depósitos vetiformes hospedados en zonas de cizalla, El Bagre-Antioquia, Colombia
DOI:
https://doi.org/10.15446/esrj.v26n1.92419Keywords:
El Bagre, Ore-Shoots, Geostatistics, Lode Gold Deposits (en)El Bagre, Altas Leyes, Geoestadística, Depósitos Vetiformes (es)
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Shear zone hosted lode gold type deposits at the El Bagre in the northeastern zone of Antioquia department of Colombia, are the only evidence of Permian gold mineralization to date in Colombia Andes. Orebodies at the El Bagre are structurally controlled and are considered as the product of ore-forming fluids derived from at least two episodes of fluid flow between the shear zones, thus different fluid flow could lead to orebodies and ore shoots plunge in different directions. The La Ye orebodies tend to strike to the NNW-NS and plunge to the SW, Mangos orebodies tend to strike (as a whole) to the NS-NNE and plunge to the NE and Cordero orebodies tend to strike (as a whole) to the NNW-NS and plunge to the NE. The ellipses determined by variogram modelling for these orebodies, reveal the anisotropy of gold mineralization and therefore the orientation of ore-shoots. The long axes of the anisotropy ellipses trend SSE. These high grades distributions are related to sinistral shearing and NNW-SSE faulting during D3 deformation event. This study exemplifies a simple and effective tool for exploration strategies regarding of orebodies, ore-shoots and ore-controlling structures relationships
Los depósitos vetiformes de oro hospedados en zonas de cizalla en El Bagre, al noreste del departamento de Antioquia, son la única evidencia de mineralización de oro Pérmica hasta la fecha en los Andes Colombianos. Los cuerpos minerales en El Bagre son controlados estructuralmente y son considerados como el producto de fluidos de mena derivados de al menos dos episodios de flujo al interior de las zonas de cizalla, por tanto, diferente flujo de fluidos podría llevar a que los cuerpos de mena y las zonas de alta ley tengan direcciones de buzamientos diferentes. Los cuerpos de mena de La Ye tienen un rumbo de NNW-NS y buzan el SW, en Mangos los cuerpos de tienen una dirección de rumbo NS-NNE y buzan hacia el NE y los cuerpos de mena en Cordero tienen un rumbo de NNW-NS y buzan hacia el NE. Las elipses determinadas por el modelamiento variográfico para estos cuerpos de mena, revela la anisotropía de la mineralización de oro y por tanto la orientación de las zonas de alta ley. Los ejes mayores de los elipsoides de anisotropía tienden hacia el SSE. Estas distribuciones de las altas leyes de oro son relacionadas a un cizallamiento sinestral y fallamiento NNW-SSE durante el evento de deformación D3. Este estudio ejemplifica una herramienta simple y efectiva para las estrategias de exploración referentes a las relaciones entre los cuerpos de mena, las altas leyes y las estructuras controladoras de mena.
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