Geology of porphyry and skarn type copper polymetallic deposits in southern margin of Qaidam Basin
WU JianHui1,FENG ChengYou2,ZHANG DeQuan2,LI JinWen2 and SHE HongQuan2(1 Hubei Geosciences Professional College,Jingzhou 434000,Hubei,China; 2 Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China)
Copper polymetallic deposits of porphyry and skarn type are well developed in southern margin of the Qaidam Basin,whose ore-forming elements are mostly copper,molybdenum,lead and zinc with accompanying elements of gold and silver. A prominent feature of such ore deposits is that mineralizations of porphyry type and skarn type coexist in the same ore deposit. Intrusive rocks related to mineralization are Indosinian intermediate-acid small intrusive bodies assuming hypabyssal and high-level emplacement features. Rock-forming and ore-forming ages of these deposits are consistent,being Middle to Late Triassic. They were formed under the crust-mantle interaction during the late collision of East Kunlun orogeny,forming a metallogenic series with skarn-type iron polymetallic deposits and hydrothermal veinlike polymetallic deposits and orogenic gold deposits of this stage.