摘要
老厂矿区围岩蚀变具多类型、多期次、多成因叠加特点。火山岩后期及期后的蚀变为硅化、碳酸盐化、钠化,与金属矿化关系不很密切;花岗岩后期及期后的蚀变为矽卡岩化及钾化,与铜-铅-锌-银矿化关系密切;钾长石-石英细脉带与角闪石角岩相可提供较可靠的隐伏岩体信息。围岩蚀变分带(自下而上)为:花岗质细脉带—矽卡岩化带—石英绢云母化带(钾化带)—青磐岩化带(钠化带)—铁锰碳酸盐化带。
The wall rock alteration in the Laochang mining district displaysmulti-tvpe, multiphase and multiple-genesis superimposed characteristics.Late-volcanic and postvolcanic alteration possesses silicification, carbona-tization and albitization and is unrelated to metallization; Late-granitie andpostgranitie alteration possesses skarnization and potash-feldspathizationand is closely related to Cu-Pb-Zn-Ag mineralization; Potashfeldspar-quartz veinlet zones and hornblende hornstone facics may provide moredependable information about hidden granites. Wall rock alteration zoningof granitic veinlet zone-skarnization-quartz sericitized zone (potassicalteration zone), -propylitization (albitized zone)-Fe-Mn-carbonatizedzone from bottom to top is identified.
基金
中国有色金属工业总公司下达的87-WS-1科研项目的一部分成果
关键词
银矿
铅锌矿
围岩
蚀变
矿床
wall rock alteration
Pb-Zn deposit
Ag deposit
Yunnan
Laochang
