华北陆台北缘糜棱岩型金矿地质特征及找矿方向

以排山楼金矿床和八亩地金矿点为例,总结了华北陆台北缘韧性剪切糜棱岩型金矿的地质特征:①地处地体边界的多期复杂活动带;②韧脆性剪切富集金,矿化局限于糜棱岩内;金矿与韧性剪切糜棱岩二者同生;③含金纹带状集合体组成主要为细粒石英和黄铁矿;④矿体呈透镜状,金的集合体在糜棱岩中与糜棱面理呈整合关系;⑤矿石主要组分不是简单的裂隙充填物,而是动态重结晶的产物,表明成矿是活化或复活的韧性剪切作用的产物;⑥蚀变为弱绢云母化、绿泥石化和碳酸盐化.

GEOLOGICAL CHARACTERISTICS AND ORE-SEARCHING DIRECTIONS FOR MYLONITE TYPE GOLD DEPOSITS IN NORTH MARGIN OF THE NORTH CHINA PLATFORM

Taking gold deposits of Paishanlou and Bamudi as examples this paper summarizes geological characteristics of the ductile shearing zone''s mylonite type gold deposits in north margin of the North China platform as follows:(1)occurrence of the deposits in mobile belts at terrain boundaries where multi-tectonics took place;(2)gold concentration by ductile shearing with mineralization confined in mylonite and the gold deposit associated with the ductile sheared mylonite;(3)the auriferous laminar assemblages consisting of fine quartz and pyrite;(4)ore bodies occurring as lenses with the auriferous laminar assemblages conformable with the mylonitic foliation;(5)ore components appearing to be the products of recrystalization instead of the simply crack filling materials and indicating that the ore is the product of rejuvenated ductile shearing;(6)weak sericitization,chloritization and carbonation.Then the ore-searching directions are pointed out.