广西长坡锡多金属矿床地球化学异常分带特征及找矿模式

大厂长坡锡多金属矿床自上而下为陡倾斜裂隙大脉及细脉、似层状细脉浸染型和似层状网脉浸染型矿体;矿体和蚀变围岩中挥发性和较低温矿物的元素组合在上部富集,而较高温矿物的元素组合在下部富集;原生晕元素组合的垂直分带前缘晕为F、B、Hg、Ba、Ga,中程晕为Ag、Cu、Sb、Bi、As、Pb,深部晕为Sn、Pb、Zn、Mn、Co、Ni;不同标高矿体、蚀变围岩和原生晕中特征元素的比值自上而下呈现有规律的变化;矿上地表原生晕水平分带明显.据此建立了长坡锡多金属矿床矿化深度和深部规模的地球化学找矿预测模式.

Geochemical Characteristics for Anomaly Zonality and Prospecting Model of Changpo Super Sn Polymetallic Deposit in Guangxi

From top to bottom of the ore body,super Sn poly metallic deposit is disseminated as the steeply dipping joint vein,thread vein,layer-like fissure vein and layer-like stockwerke.In ore body and altered wall rock,the association of elements of the volatile and low-temperature minerals present on the top while the high-temperature mineral present on the bottom.The perpendicular zonality of primary halo can be devided into three zones of enrichment.The front halo is rich for F,B,Hg,Ba,Ga.The medium halo is rich for Ag,Cu,Sb,Bi,As,Pb.The deep halo is rich for Sn,Pb,Zn,Mn,Co,Ni.The ratio of characteristic elements in different elevation of ore body,altered wall rock and primary halo changes regularly from top to bottom.The horizontal zonality of the primary halo in the surface is obvious.Accordingly,the predictive geochemical prospecting model in depth and deep scale for Changpo super Sn poly metallic deposit is established.