Abstract
Saidu gold deposit, located in back arc basin at south margin of the west Altay Mountain, is orogenic gold deposit. It is strictively controlled by ductile-shear zone, occurring in altered mylonite zone of Mar-kakol giant belt. The δ34S values of pyrite in the gold deposit range from 3.53‰ to 5.88‰; the lead isotopic compositions are fairly constant, with 206Pb/204Pb ranging from 18.010 to 18.359, 207Pb/204Pb ranging from 15.488 to 15.579, and 208Pb/204Pb ranging from 38.1116 to 38.3551. Sulfur and lead isotope studies indicated that ore-forming materials originated from the deep portion, and had close relationship with magmatic activity. The ore materials were obtained from rocks of the lower crust during the orogenic period; the main gold mineralization should have relations with tectonic extention settings of post-collision orogenic.
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