Abstract

In the Western Sudetes, Bi- and Ag-tellurides have been described from arsenic-polymetallic gold deposits. Crystallization of tellurides occurred in at least in two separate events of ore crystallization at a temperature range from 300 to 200°C. The first event, dominated by Bi-tellurides, was connected with metasomatic processes in the contact zones of post-tectonic calc-alkaline granites. The second event, with Ag-tellurides, was connected with epithermal low sulphidation processes associated with post-orogenic regional extension and uplift. Bi and Te played a significant role as scavengers of non-refractory gold.

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