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江西横峰县篁村铅锌银矿床地质特征及找矿标志
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摘要
篁村铅锌银矿床属隐伏型矿床,处于扬子地块南缘,赣东北断裂带中段;矿体主要赋存于新元古界青白口系登山群板竹坑组变余岩屑砂岩中,矿体多呈透镜状、似层状产出,明显受到层间破碎带控制;矿石主要为细脉状、浸染状方铅矿、闪锌矿、辉锑铅银矿矿石,脉石矿物为石英、绢云母、方解石等;矿石品位较低(铅1.66%、锌2.30%、银92.34g/t);围岩蚀变特征明显。本文从成矿地质背景和矿床地质特征出发,重点从矿床规模、矿体产状、赋矿部位、围岩性质、矿石特征等方面探讨了篁村铅锌银矿床的成因,并提出了在该区寻找同类矿床的标志。
Huangcun lead-zinc-silver deposit belongs to the concealed deposit in the southern margin of the Yangtze block,the middle Northeast Jiangxi fracture belt;ore bodies mainly occur in palimpsest lithic sandstone of Banzhukeng group of the Neoproterozoic Qingbaikouan mountain group,the lenticular ore bodies show bedded occurrence and controlled obviously by the interlayer fracture zone.The ores are major veinlet disseminated galena,sphalerite and diaphorite,vein minerals are quartz,sericite and calcite.The ore grade is rather low(with lead 1.66%,zinc 2.30%,silver 92.34g/t etc.).The wall rock alteration is very clear.Based on the geological background and the geological characteristics of the deposit,this paper discusses the causes of the Pb-Zn-Ag deposit in Huangchen from the aspects of deposit scale,ore body formation,ore-bearing site,wall rock properties and ore characteristics and put forward the similar signs for prospecting in this area as well.
引文
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