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.
关键词
矽卡岩型/伟德山期岩浆岩/稀土元素/微量元素/稳定同位素/成矿时代/矿床成因
Key words
skarn-type/Weideshan Period magmatic rocks/rare earth elements/micro-element/stable isotopes/metallogenic age/ore genesis
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