Abstract
The Twin Peaks epithermal gold deposit, located in East Junggar, China, is hosted by the late Paleozoic Kulankazigan island-arc complex. The deposit is structurally controlled by the extensional radial fractures associated with development of the Early Carboniferous Twin Peaks volcanic dome. It is stratigraphically restricted to the upper Batamayineishan Formation, which is subdivided into two units: the lower andesite unit that contains the ore bodies, and the upper rhyolite unit. Four hydrothermal alteration zones have been identified in both East and West Zones of the deposit. Each zone is characterized by a highly silicified core, and then there is an outward progression through adularia–sericite, argillic, and propylitic zones. The presence of adularia and sericite, in addition to the sulfide mineral association, suggests that the gold deposit is of the "adularia-sericite" or "low sulfidation" type. The East Zone ore body is offset by post-mineralization, high-angle reverse faults that strike parallel to the zone and small-scale, strike-slip faults that strike perpendicular to the zone.
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