5 research outputs found
GeoquĂmica de isĂłtopos estĂĄveis (C, S e O) das rochas encaisantes e do minĂ©rio de Cu(Au) do depĂłsito cristalino, provĂncia mineral de CarajĂĄs, ParĂĄ
We describe stable isotopic data from country rocks and sulfide ores of the Cristalino Cu(Au) deposit (CD), CarajĂĄs Province, Brazil. Calcite from whole rock and sulfides grains from mafic to felsic volcanics and âhydrothermal brecciasâ were analyzed. The CD, an Archean (ca. 2.7Ga) IOCG deposit, occurs in hydrothermalized (e.g., alkalinization; carbonatization; sulfidation; etc.) ItacaiĂșnas Supergroup supracrustals. Diorites crosscut these rocks and can relate to Cu-ore. Isotopic signatures of
À34S and À13C and À18O plot in the mantle sulfides and in the carbonatite primary field respectively. Ore fluids may be derived from a granitic or dioritic intrusion or leached
from MORB-type mafic volcanic rocks