The Upper Devonian - Lower Carboniferous Sourian
complex, is composed of clastic - carbonates, volcanic, metamorphic
rocks and quartz lenses hosts copper mineralization in Gian area of
Fars province.
This complex is metamorphosed to green schist facies. This
metamorphism resulted In massIve to disseminated sulfide
mineralization in the direction of schistosity and within quartz lenses.
Low-grade green schist facies metamorphism is recognized with
cataclastic flow and fracturing of pyrite crystals, infilling of fractures
of pyrite with chalcopyrite, pressure shadow of chalcopyrite around
pyrite, recrystalization and presence of triple junctions in pyrite.
Distribution pattern of REE in schists of Gian copper shows a
decreasing trend from La to Lu. The ratio of 2:LREE/LHREE is more
than one and the ratio of LaN I YbN is less than 15. This indicates that
schists are formed by the metamorphism of shales and the ratio of
(LalLu),,> 1 indicates that the transfer of REE has been affected by
surface adsorption. It may be concluded that this copper occurrence is
the result of ore-bearing shale metamorphism.