斑岩型钼矿床蚀变岩石类型和蚀变矿化分带特征  

Alteration Rock Types and Alteration Mineralization Zoning Characteristics of Porphyry Molybdenum Deposits

作　　者：彭成[1] 李威[1] PENG Cheng;LI Wei(The Second Geological Prospecting Institute of Henan Bureau of Geo-exploration&mineralDevelopment,Zhengzhou 451464,China)

机构地区：[1]河南省地质矿产勘查开发局第二地质勘查院,河南郑州451464

出　　处：《有色矿冶》2020年第4期4-8,共5页Non-Ferrous Mining and Metallurgy

摘　　要：通常的斑岩型钼矿床是指围岩中不含碳酸盐岩岩石的矿床类型,其实矽卡岩型钼矿床从根本上说其围岩成分只有少部分碳酸盐岩岩石而仍属于斑岩型钼矿床。对于研究斑岩型钼矿床蚀变矿化分带的目的,就是要总结分带与矿化之间的紧密联系。理论上的分带应该是岩体向外具有四个蚀变矿化带:即钾化带、硅化带、绢英岩化带和青盘岩化带,而大部分的工业钼矿体产于硅化带,次为钾化带和绢英岩化带内,青盘岩化带内几乎不含矿。硅化的主要形式就是数以百万计的不同阶段的、不同大小的石英细脉,它们的密集程度不同,含矿浓度不同,展布方向不同,有时构成网脉状。这就是矿床不同部位的矿石品位各异的原因所在。钾化带主要是各种细脉内含有不同程度的钾长石矿物,有的是纯粹的钾长石脉,这类细脉的矿化相对较弱,其带内矿体规模相对较小。以蚀变矿化的分带作为一种找矿标志也是一种地质找矿领域切实可行的应用手段。The usual porphyry molybdenum deposit refers to the type of deposit without carbonate rocks in the surrounding rock.In fact,skarn molybdenum deposit basically has only a small part of carbonate rocks in the surrounding rock and still belongs to porphyry molybdenum deposit.The purpose of studying altered mineralized zoning of porphyry molybdenum deposits is to summarize the close relationship between zoning and mineralization.In theory,there are four altered mineralized zones in the rock mass outward:the K_zone,the silicified zone,the sericite zone and the Qingpan lithologic zone.Most of the industrial molybdenum ores are produced in the silicification zone,followed by the potassium and sericite zones,there is almost no ore in the Qingpan lithologic zone.TThe main form of silicification is the millions of quartz veins of different sizes at different stages.They vary in density,ore concentration,distribution,and sometimes network veins.The potassic mineralization zone is mainly composed of feldspar minerals of different degrees in various veins,some of which are pure potassic feldspar veins.The mineralization of such veins is relatively weak,and the scale of ore bodies in the veins is relatively small.

关 键 词：斑岩型钼矿床 蚀变岩石类型 蚀变矿化分带 硅化带 钾化带 

分 类 号：P618.65[天文地球—矿床学]