Material assimilation in a shallow diapiric forceful intrusion: evidence from microstructures and csd analysis in a porphyritic intrusive body, “la línea” tunnel, central cordillera, colombia
Archivos
Autores
Rayo, Lorena
Zuluaga, Carlos A.
Director
Tipo de contenido
Artículo de revista
Idioma del documento
EspañolFecha de publicación
2008
Título de la revista
ISSN de la revista
Título del volumen
Documentos PDF
Resumen
The contact between the unit Porphyry Andesite and the Cajamarca Group is observed in the "Túnel de la Linea" section. The integration of petrographic, geochemical and textural (crystal size distribution, CSD) analysis allows description of physical and chemical processes that took place in the contact zone in order to propose a model for the intrusion. Material assimilation produced quartz enrichment towards pluton's boundaries associated to a simple process of melt injection. The difference between host rock and hot melt rheologies causedshear stress that produced crystal breaking, folding and foliation rotation.