黑龙江省嫩江县二道坎村银多金属矿床地质特征及找矿标志
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摘要
二道坎村银多金属矿床是黑龙江省首例独立银矿床,伴生铅锌锰等元素,其赋矿地层为顶志留统—中泥盆统泥鳅河组,矿体主要赋存在辉绿岩与泥鳅河组接触带的地层一侧。矿区内共圈定2条银多金属矿体,均呈脉状赋存于北西西向断裂构造带中;矿石中金属硫化物以黄铁矿为主,方铅矿、闪锌矿次之;银矿物以辉银矿为主,其次为深红银矿,少量脆银矿、自然银等;矿体围岩蚀变发育,主要有硅化、碳酸盐化、高岭土化、绢云母化、绿帘石化、绿泥石化、黄铁矿化,其中硅化、黄铁矿化、绢云母化与成矿关系密切。泥鳅河组地层、北西西向断裂构造、辉绿岩脉等是重要地质找矿标志,Ag、Pb、Zn元素土壤地球化学异常是重要的地球化学找矿标志。
Erdaokancun Silver Polymetallic Deposit is the first independent silver deposit of Heilongjiang Pro-vince.The deposit is associated with lead,zinc,manganese and other elements.The ore host strata is top Silurian-upper Devonian Niqiuhe Formation.The ore bodies mainly occur on the strata that is on the contact zone of diabase and Niqiuhe Formation.There are 2 silver polymetallic ore bodies delineated in the district,both occurring in NW fault in vein types;the metal sulfide are mostly pyrites,followed by galena and sphalerite;the silver minerals are mostly acanthite,followed by pyrargyrite and minor content of stephanite and native silver.Wall rock alteration develops in ore bodies,mainly including silicification,carbonatization,kaolinization,sericitization,epidotization,chloritization and pyritization.Among them,silicification,pyritization and sericitization are closely related to the mineralization.Strata in Niuqiuhe Formation,NWW fault,diabase vein are important geological prospecting indicators.Ag,Pb,Zn soil geochemical anomalies are important geochemical prospecting indicators.
Erdaokancun Silver Polymetallic Deposit is the first independent silver deposit of Heilongjiang Pro-vince.The deposit is associated with lead,zinc,manganese and other elements.The ore host strata is top Silurian-upper Devonian Niqiuhe Formation.The ore bodies mainly occur on the strata that is on the contact zone of diabase and Niqiuhe Formation.There are 2 silver polymetallic ore bodies delineated in the district,both occurring in NW fault in vein types;the metal sulfide are mostly pyrites,followed by galena and sphalerite;the silver minerals are mostly acanthite,followed by pyrargyrite and minor content of stephanite and native silver.Wall rock alteration develops in ore bodies,mainly including silicification,carbonatization,kaolinization,sericitization,epidotization,chloritization and pyritization.Among them,silicification,pyritization and sericitization are closely related to the mineralization.Strata in Niuqiuhe Formation,NWW fault,diabase vein are important geological prospecting indicators.Ag,Pb,Zn soil geochemical anomalies are important geochemical prospecting indicators.
引文
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