山东邹平火山岩盆地王家庄—碑楼铜矿床地质特征及成因探讨

Geological Characteristics and Metallogenic Conditions of Wangjiazhuang Copper Deposit and Beilou Copper Deposit in Zouping Volcanic Basin in Shandong Province

王家庄、碑楼铜矿床位于邹平火山岩盆地内,区内为山东重要的铜矿产地。在收集以往地质工作资料的基础上,详细分析了王家庄铜矿床与碑楼铜矿床的地质特征,总结了赋矿岩石、围岩、矿体规模、形态、产状等特征,分析了矿石中金属矿物与矿石类型;对王家庄与碑楼铜矿的成矿期次与成矿条件进行了探讨,研究发现,邹平火山岩主要经历了3次喷发与侵入活动,按空间分布位置分成外成矿带、中成矿带和内成矿带3个成矿带,王家庄与碑楼铜矿位于内成矿带,研究认为其形成于岩浆活动晚期。通过对比国内不同斑岩型铜矿含矿岩体岩石化学特征,发现王家庄岩体及碑楼岩体等都是形成斑岩铜矿的有利地段。通过对王家庄铜矿与碑楼铜矿的矿化蚀变标志研究,发现其蚀变以钾化、钾硅化、硅化等为主,指出研究区内侵入岩—潜火山岩钾化是铜、硫富集的重要蚀变标志。

Wangjiazhuang copper deposit and Beilou copper deposit are located in Zouping volcanic basin.This area is an important copper deposit in Shandong province.Based on previous geological work data in this area,geological characteristics of Wangjiazhuang copper deposit and Beilou copper deposit have been analyzed in detail.Characteristics of orebearing rocks,surrounding rocks,ore body size,morphology and occurrence have been studied,and the metal minerals and ore types have been analyzed.The metallogenic stages and the metallogenic conditions of Wangjiazhuang and Beilou copper deposits have been studied.Through research data,It is found that Zouping volcanic rock has mainly experienced three eruptions and intrusion activities,and the spatial distribution position is divided into three metallogenic belts:outer metallogenic belt,middle metallogenic belt and inner metallogenic belt.It is regarded that Wangjiazhuang and Beilou copper deposits are formed in late magmatic activity and are located in the inner metallogenic belt.Comparing with petrochemical characteristics of orebearing bodies of different porphyry copper deposits in China,it is found that Wangjiazhuang rock body and Beilou rock body are favorable areas for forming porphyry copper deposits.The mineralization alteration signs of Wangjiazhuang and Beilou copper deposits are studied.The alteration is mainly composed of potash,potash silicification,and silicification.It is pointed out that potassiumization of intrusive rockslatent volcanic rocks in the study area is an important alteration sign of copper and sulfur enrichment.