一些与韧性剪切带有关的金矿地质特征

目前，在世界范围内已发现越来越多的金矿赋存于韧性剪切带中，根据其主成矿期与韧性剪切带形成时间的关系可分为同韧性剪切型金矿和韧性剪切后型金矿。同韧性剪切型金矿主成矿时代同容矿韧性剪切带的发生、形成是同步的，韧性剪切活动不仅为成矿提供了空间，而且与成矿直接有关，容矿围岩为超糜棱岩、糜棱岩、初糜棱岩等，靠化学品位圈定矿体，矿石类型以浸染状为主；韧性剪切后型金矿成矿时代明显晚于韧性变形期，二者间隔时间较长，剪切活动仅为成矿提供空间，矿石类型完全取决于成矿前之容矿带的变形特征。

GEOLOGICAL CHARACTERISTICS OF SOME GOLD DEPOSITS RELATED TO DUCTILE SHEAR ZONE

Now,more and more gold deposits occouring in ductile shear zone have been found in the world. According to the relation ship between main ore - foming stage and ductile shear zone, gold deposits are classified into synductile shear type and gold deposit of post ductile shear type. The main ore -foming stage of the gold deposits of synductile shear type is syn-chronous with the happening and formation of gold -bearing ductile shear zone. The ductile shearing activity not only provides places for ore deposits, but also is related directly with metallogenesis. the host wall rocks are ultramy -lonite, mylonite and protomylonite etc. Ore body is outlined by chemical analysis and the ores is mainly of disseminated type. The ore-foming stage of the gold deposits of post ductile shear type is obviously later than ductile shear deformation with a large interval. The type of ores is controlled by deformation charac-teristics of ore-bearing zone.