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.