DOI: http://dx.doi.org/10.18257/raccefyn.303

Artículo original

Nuevas evidencias que soportan la escisión de la formación Silgará y propuesta de un nuevo marco estratigráfico para el basamento metamórfico del Macizo de Santander (Cordillera Oriental de Colombia)

Luis Carlos Mantilla-Figueroa, Carlos Alberto García-Ramírez, Víctor A. Valencia

Resumen


Estudios geocronológicos recientes realizados en la Formación Silgará (nombre original asignado a un grupo de esquistos y filitas aflorantes al SW del Macizo de Santander), han servido de base para proponer la escisión de ésta formación en las siguientes unidades: Esquistos del Silgará s.s., Esquistos del Chicamocha y, Filitas de San Pedro. Estas unidades, se caracterizan por presentar diferentes litologías metamorficas y diferentes edades de depositación de su protolito.
En el contexto de ideas antes referido, el trabajo que aquí se presenta tiene como propósito aportar nuevas evidencias que apoyan la propuesta de escisión antes referida, a partir de análisis isotópicos del Hf en zircones detríticos presentes en cada una de las tres unidades ya referidas, y puntualmente a partir de análisis de geoquímica de roca total. Adicionalmente, con base en la información geológica acumulada, se plantea un nuevo marco estratigráfico para el basamento metamórfico del Macizo de Santander. © 2016. Acad. Colomb. Cienc. Ex. Fis. Nat. Todos los derechos reservados.


Palabras clave


Colombia; Macizo de Santander; Zircones Detríticos; Valores Épsilon Hf.

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Referencias


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