Cinética de la nucleación y el crecimiento del granate en las rocas metapelíticas de la Formación Silgará, región suroccidental del Macizo de Santander

Abstract

Garnet in the Silgará Formation metapelitic rocks that crop out in the southwestern region of the Santander Massif shows different textural varieties and provides valuable information about the deformation history.
The Crystal Size Distribution (CSD) analysis of this mineral reveals that it grew between 1.342 and 81.511 years, with nucleation rates decreasing with increasing metamorphic grade. Garnet possibly grew through multivariant reactions combined with high values of critical “overstepping”. The nucleation and growth conditions were relatively constant through time and the small deviation of the exponential behavior of CSD reflects that dissolution and “annealing” process were low in magnitude after garnet growth ceased.