(in its broad sens, figure on the right) are composed of alternation
of massive amphibolites (in the strict sens with often more than
with amphibole (right figure). The amphibolite (strict sens) shows
assemblage* with green hornblend (tschermakite), garnet, plagioclase
(15-45% anorthite) and biotite. The local retromorphosis*
of those rocks lead to the formation of epidote-calcite-chlorite assemblage.
gneiss* (figure below) are formed of feldspars porphyroblasts
(plagioclases [8-25% anorthite] and K-feldspars), quartz and two micas
biotite). In the
border, porphyroblasts tend to disappear, leaving place to a leucocratic*
facies, called border facies (light rose in
map). This facies
is formed by a top to the North shearing*
linked to the nappes*
emplacement (see next page).