胶东大庄子金矿床地质特征与成因探讨  

Geological Characteristics and Genesis of Dazhuangzi Gold Deposit, East Shandong

作　　者：连国建[1] 胡文瑄[1] 张文兰[1] 宋玉财[1] 王昭坤 易富章[3] 

机构地区：[1]南京大学地球科学系,江苏南京210093 [2]山东省黄金集团有限公司,山东济南250014 [3]中国冶金地质勘查工程总局山东局三队,山东烟台264002

出　　处：《矿床地质》2004年第1期67-76,共10页Mineral Deposits

基　　金：国家自然科学基金 (编号 :4 99730 0 1 );中国冶金地质勘查工程总局及山东地质矿产局科研基金的资助

摘　　要：研究表明大庄子金矿床受NNE走向的层间滑动断层及其伴生张性裂隙的控制 ,分别产出蚀变破碎带型和石英脉型两种类型的矿体。蚀变破碎带型矿体围岩蚀变发育 ,自下而上分为 :钾长石化带 ,黄铁矿化、绢英岩化及黄铁绢英岩化带 ,绢英岩化和碳酸盐化带。矿石中含丰富的黄铁矿、方铅矿、闪锌矿和黄铜矿等多金属硫化物。金以银金矿为主 ,次为金银矿 ,多被金属硫化物包裹或存在于裂隙中 ,少量以自然金分散其中。黄铁矿中金含量高达 40× 10 - 6 ～ 960× 10 - 6 。综合分析表明 ,该矿床与胶东其他金矿床成矿背景一致 ,形成于陆内俯冲中_晚期的拉张环境。The Dazhuangzi deposit is a large_size gold deposit recently discovered on the s outhwestern margin of Jiaobei Precambrian terrain. It shows different characteri stics from the other types of gold deposits in the middle and north of the terra in. The Dazhuangzi gold deposit occurs in Early Proterozoic Jingshan Group withi n Jiaobei terrain, neighboring the Jiaolai fault_controlled basin to the south. Two types of orebodies, namely quartz_vain type and altered_rock type, were foun d in this gold deposit, which had never been seen in other gold deposits in this area. There are three different kinds of eroded zones across the mineralization horizon, which are in upward succession shallow red zone, dark gray zone and sh allow gray zone. Besides pyrite, large amounts of chalcopyrite, sphalerite and g alena are developed in the deposit. The principal gold_bearing mineral is electr um,with some gold distributed in pyrite. In the light of its special geological settings and peculiar features, it is believed that the Dazhuangzi gold deposit is a new type of gold deposit formed in Yanshanian period. It is controlled by both a deep fault and a shear zone in Jingshan Group.

关 键 词：金矿床 地质特征 矿床成因 地质学 蚀变破碎带型 石英脉型 

分 类 号：P618.51[天文地球—矿床学] P611[天文地球—地质学]