与伟德山期岩浆岩有关的多金属成矿作用研究-- 以夼北矽卡岩型铜矿床为例.

The eastern Wehai area, bordered by the Mishan Fault, is an important polymetallic mineralization zone in the Jiaodong region. It hosts a series of copper molybdenum, lead zinc, and gold silver polymetallic mineral deposits related to the late Yanshanian Mesozoic intermediate-acidic intrusive magmatic activity. This study investigates the geochemical characteristics, metallogenic age, and ore genesis of the Kuangbei skarn-type copper deposit, a typical deposit in the area. Testing results of rare earth elements (REEs) and micro-elements suggest that the intrusive activities of Weideshan Period magmatic rocks provided both the metallogenic materials and the hydrothermal conditions essential for the deposit formation. Research on stable isotopes of S and Pb indicates a multi-source origin of the ore-bearing hydrothermal fluids. Zircon U-Pb dating reveals that the formation age of Kuangbei Copper Deposit, approximately 116. 6 Ma, is close to the diagenetic age of Weideshan Period magmatic rocks. This deposit is a Mesozoic contact metasomatic (skarn) type copper deposit. [ABSTRACT FROM AUTHOR]