Metallogenic series and metallogenic model of Cu-Au polymetallic deposits in Dayaoshan area of eastern Guangxi

The deposits(ore spots) that compose Cu-Au polymetallic deposits in Dayaoshan area principally have three types: porphyry type,skarn type and faulted-altered rock type.In the deposits,the principal mineral is gold and mineralization of copper,silver,lead and zinc can be found.A relatively completed combination of metallogenic series is formed and it can be classified into two deposit metallogenic series and four deposit metallogenic sub-series.In the paper it is concluded that: 1) Mineralization is closely tied to hypabyssal-ultrahypabyssal magmatite,and magmatic activities provide heat source and hydrothermal solution for forming of deposits;2) faulted structure provides migration pathway and controls the distribution of ore bodies;and 3) Sinian-Cambrian System is the major ore source bed.A three-in-one regional metallogenic model which includes source bed,structure and magmatic activity is established.