Abstract

RAYO, Lorena  and  ZULUAGA, Carlos A.. 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. Earth Sci. Res. J. [online]. 2008, vol.12, n.1, pp.31-43. ISSN 1794-6190.

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 caused shear stress that produced crystal breaking, folding and foliation rotation.

Keywords : Cajamarca Complex; Cordillera Central; CSD; Igneous and metamorphic petrology; Andesite- Dacite porphyry; La Línea Tunnel..

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