SYNCHRONOUS STRUCTURE CONTROL OF SUPERLARGE ORE-DEPOSITS

The control of synchronous structures on formation of superlarge strat abound ore deposits is immense. Based on studies of ore deposits in So uth Qinling, northern Guangdong, Langshan and other areas, three new i deas in comparison with examples of ore control of synchronous structu res both in China and abroad are proposed: (i) multiorder ore control of synchronous structures, which means that synchronous structures of different orders display different controls on ore deposits; (ii) sync hronous structures in different stages of basin evolution display diff erent controls on basin fluid system and ore-forming system; (iii) syn chronous structure accompanying hydrothermal mineralization as a preex isting weak surface in earth crust often reactivate in later tectono-t hermal event to be a channelway for magma or thermal fluids which supe rimposed on and reformed preexisting ore beds to form large or superla rge composite ore deposits.