Abstract
Amphibole bearing parageneses from the western part of Mt. Psunj (Croatia) record evidence of prograding metamorphism. Optical and microprobe analyses, together with thermobarornetric evaluations on amphibole bearing parageneses, show a zonation with Si- and Mg- concentrations decreasing from core to rim along with increasing Al-, Na- and Ti- content. Changes in the chemical composition of amphibole grains are interpreted through coupled substiutions and reactions with co-ex isting minerals during an increase in metamorphic conditions from greenschist to amphibolite facies. The change in P-T conditions recorded in the growth of amphibole grains (general prograding pattern) together with changes in the modal compositions in related parageneses could be interpreted in a model of a subduction zone.
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