摘要
凤县老厂火山岩属奥陶系海相细碧—石英角斑岩系,矿区火山岩可分为两个主喷发旋回,下部基性喷发旋回和上部酸性喷发旋回,下部基性喷发旋回发育铁矿,上部酸性旋回中发育铅锌铜多金属硫化矿;矿区铅锌矿受火山机构控制明显,KT1主铅锌矿体赋存于火山颈(岩颈)中,KT2矿体(贫矿体)赋存于近火山口相酸性凝灰岩层中。
Volcanic rocks occurring in the Laochang area of Fengxian county is of the Ordovician marine spilite-quartz keratophyre system,which can be divided into two major eruption cycles of the bottom basic eruption cycle and the upper acid eruption cycle.Iron ores occur in the bottom basic eruption cycle and lead-zinc polymeltallic sulfide ores occur in the upper acid eruption cycle.Lead-zinc mineralization in the deposit is evidently confined by volcanic apparatus.The major lead-zinc orebody KT1 exists in the volcanic neck（rock neck） and the orebody KT2（poor mineralized body） in acid tuff near the volcanic vent.
出处
《陕西地质》
2010年第2期23-27,共5页
Geology of Shaanxi
关键词
凤县老厂
铅锌矿:火山机构
Laochang of Fengxian
lead-zinc ore
volcanic apparatus
