广西风凰山银矿构造控矿作用分析

凤凰山银矿床位于广西西大明山复式背斜东北部小明山次级背斜北翼的走向断裂破碎带中。银矿体的形状、产状及规模明显受以 EW向为主体的复合控矿断裂系统的控制 ;Ag、Mn、As、Sb异常群沿控矿构造带分布 ,并与断裂带银矿体具有极好的拟合度。主断面的形态明显控制矿体赋存部位 ,矿体主要赋存于断裂产状变化部位。含矿断裂带的破碎强度与银矿化关系密切 ,银矿化以早期矿化部位的裂隙为通道呈叠加富集。富矿体赋存于成矿期应力场局部引张或减压空间、低能部位。

An analysis of the ore-controlrole of structures in the Fenghuangshan Silver deposit, Guangxi

The Fenghuangshan silver deposit is located within the strike fault shatter zone on the northern limb of Xiaomingshan anticline in northern Xidamingshan composite anticline,Guangxi.The shape,attitude and size of silver orebodies are obviously controlled by mainly EW\|trending composite ore\|control fault system,with Ag,Mn,As,Sb anomalous groups distributed along the ore\|control faulted structural zone and exhibiting excellent fitting with the silver orebodies in the fault zone.The shape of the principal section evidently controls the positions of the orebodies,and the orebodies mainly appear in places where the attitude of the section varies.The fracturing intensity of the ore\|bearing fault zone is closely related to silver mineralization,which assumes superimposed enrichment,with the positions of early mineralization serving as channelways.Rich orebodies occur in local extensional or decompressional space or low energy positions of the ore\|forming stage stress field.