萨瓦亚尔顿金矿床磁组构特征及与金矿化关系

利用萨瓦亚尔顿金矿区岩石磁化率各向导性参数和金含量数据,研究了磁组构与金矿化的关系,结果表明强变形带内的弱应变域是金矿化的有利部位。本文把该金矿区韧性变形带内金的成矿作用归纳为3个阶段:(1)金矿化的物质准备阶段,形成富金地层或母岩;(2)矿化流体的萃取阶段,韧性变形作用可能是其主要动力;(3)金矿体的形成阶段,处在韧性变形之后的弛豫阶段(相对张性环境).在这里,韧性变形被看作是金成矿作用的一个必不可少的动力机制和中间环节。 

THE CHARACTERISTICS OF ROCK MAGNETIC FABRIC AND ITS RELATIONSHIP TO GOLD MINERALIZATION IN SAWAYAERDUN GOLD DEPOSIT, XINJIANG

The magnetic fabric characteristics and its relationship to the gold mineralization in Sawayaerdun gold deposit,Xinjiang,China,are reported here. The data given here show compression in NW-SE direction and sinistral shearing vertical to this direction. There are contraction-type and flaser-type strains occurring alternatively in NW-SE,where flaser-type strains are much more developed. Gold-bearing veins occur in en echelon,which are products of sinistral shearing. The ore vein Ⅳ,the most important gold-bearing vein,occurs in the weakly strained area close to the most strongly strained belt. Gold mineralization exists in weakly deformed rocks closely related to quartz vein,showing post-tectonic filling and crystalling of the gold -bearing fluid. Combined with the microtexture analysis of rocks in this area,Sawayaerdun gold deposit is proposed to be a shearing zone-type gold deposit,where gold bearing fluid coming from rocks in this area through pressure solution during ductile deformation,filled fractures due to tectonic compresso-shearing.