WALL-ROCK ALTERATIONS OF THE GOLD METALLOGENIC SERIES IN TULASU VOLCANIC BASIN,WESTERN TIANSHAN

Yiermande gold deposit,Axi gold deposit and Tawuerbieke gold deposit in Western Tianshan area,formed in Late Proterozoic Tulasu volcanic basin,are three distinct types of ore deposits,with different wall rock alteration features.The wall rocks of Yiermande type of gold deposit produce such alterations as silicification,kaolinization,baritization and dickitization.The contents of As,Sb,Hg and Cu have a positive relation to Au.The wall rocks of Tawuerbieke type show silicification,sericitization,chloritization and carbonation.The content of As in wall rocks raise along with that of Au and Ag.The wall rock alterations of Axi type include mainly sericitization,adularization,carbonation,silicification and illitization.The Se and As contents are positively relaed to Au and Ag in the altered rock.