DOI: http://dx.doi.org/10.18257/raccefyn.385

Artículo original

Petrogénesis de venas de cuarzo y cianita en rocas metapelíticas de la formación Silgará, región central del macizo de Santander en los Andes colombianos

Carlos A. Ríos R., Luis Carlos Mantilla F., Oscar M. Castellanos A.

Resumen


Las rocas metamórficas de la formación Silgará (sensu lato), de edad pre-Devónico, aflorantes en la región central del macizo de Santander (Cordillera Oriental de Colombia), presentan venas hidrotermales de cuarzo y cianita ligeramente boudinadas, paralelas a la foliación metamórfica regional. Estas venas se consideran manifestaciones excepcionales, tanto por su restringida distribución en el contexto del Macizo de Santander, como por su composición y génesis. Los cristales de cianita se observan, 1) en la proximidad del contacto con las rocas metapelíticas encajantes (afectadas por metamorfismo en facies anfibolita, zona de la estaurolita-cianita), con una orientación paralela a la foliación metamórfica, lo cual indica un crecimiento progresivo durante la apertura de la vena, y 2) hacia el centro de la vena, exhibiendo una orientación al azar, lo cual sugiere un crecimiento sin un control de esfuerzos significativo. Con base en las relaciones litológicas y los estudios paragenéticos, es posible sugerir que el origen de estas venas hidrotermales se relaciona con la circulación o el escape de fluidos propios de eventos magmático-hidrotermales de edad Ordovícico?. © 2017. Acad. Colomb. Cienc. Ex. Fis. Nat.


Palabras clave


Colombia; Macizo de Santander; Formación Silgará; Venas hidrotermales; Cianita.

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Referencias


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