. The Amsaga Zone is of a major importance, due to its position in the
extreme south west of the Archean part of the Rgueibat shield, particularly to
its location close to the Akjoujt Copper mine. Some dating migmatites indicate
that granulite metamorphism affecting most Amsaga units took place between 3
and 2.7 Ga. The field observations and microscopic study of samples analyzed of
metabasite have helped to understand the relationships between lithological
units and mineralization control structures such as faults and shear zones.
This context reflects a tectonic control of implementation of the
mineralization by movements in faults and in ductile shear zones. The
implementation of the copper mineralization could be either syngenetic, related
metamorphism or hydrothermal fluid circulation, or it is late in relation
hydrothermalism associated with panafrican and hercynian orogenies of Mogrein
Guelb deposit, Akjoujt south of Amsaga. - See more at.
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