摘要
大庄子金矿Ⅰ号脉位于胶莱盆地与胶北地体接触带北缘的NNE向断裂内,矿石为含金蚀变岩型。借助围岩蚀变形成的构造蚀变带及其岩石化学成分特征的综合研究来开展成矿作用探讨和矿区找矿预测工作,研究表明:蚀变带由上盘的斜长角闪岩带和绿泥石化斜长角闪岩带以及下盘的硅化-大理岩带、绿泥石化斜长角闪岩带、强钾化花岗片麻岩带、弱钾化花岗片麻岩带和花岗片麻岩带组成;围岩蚀变过程中A l2O3,SiO2和K2O在各蚀变带中为带入组分,MgO,CO2,FeO,CaO,H2O+和MnO在弱钾化带中为带出组分而在强钾化带中为带入组分;Na2O和Fe2O3在弱钾化带中为带入组分而在强钾化带中为带出组分;硅化-大理岩带主要成分来源于成矿热液以及大庄子金矿成矿过程中主要处于还原环境。与此同时应用围岩蚀变带分布规律,成功地预测出Ⅰ号脉北部矿段往东错动80多m。
The Ⅰ vein of Dazhuangzi gold deposit, in which the .ore type is altered rock, is hosted in NNE fault between Jiaolai basin and Jiaobei terrene. This paper researches the metallogenesis and ore prospecting in the area by tectonic-alteration zone and its chemical composition. The study found that the alteration of footwall surrounding rock in I vein could be classified into the silicified marmarization zone, chloritic amphibolite zone, strongly potassic alteration zone of granite gneiss, feebly potassic alteration zone of granite gneiss and granite gneiss zone. The hanging wall, accordingly, could be classified into the chloritic amphibolite zone and amphibolite zone. In the process of alteration in granite gneiss, the matter of Al2O3, SiO2 and K2O moved into the surrounding rock all the time. MgO,CO2 ,FeO, CaO, H2O ＋ ,MnO moved out the surrounding rock in feebly potassic alteration zone, but moved into in strongly potassic aheration zone, while the Na2O和Fe2O3 made the opposite side. The primary composition of silicified marmarization zone rooted in ore-forming fluids and the ore-forming condition was in deoxidization environment. Based on the wall rock alteration allocation rules, it was successfully predicted that the north ore-body of I vein moved toward east for 80 miters comparatively to the south one.
出处
《黄金》
CAS
北大核心
2008年第12期7-10,共4页
Gold
基金
国家自然科学基金(批准号:40572063)
高等学校学科创新引智计划基金(No.B07011)
山东黄金集团青岛有限公司地质找矿科研课题
地质过程与矿产资源国家重点实验室开放基金(GPMR200626)联合资助
关键词
大庄子金矿
构造蚀变带
围岩蚀变
成矿作用
Dazhuangzi gold deposit
tectonic-alteration zone
alteration of surrounding rock
metallogenesis
