试论胶东西北部金矿化类型及其与构造关系

DISCUSSION ON GOLD MINERALIZATION TYPE AND ITS RELATION WITH TECTONIC IN NORTHWESTERN JIAODONG

胶东西北部金矿床分为三种矿化类型，即蚀变岩型、石英脉型、过渡型，统称为玲珑—焦家式金矿．它们具有明显的同源共生关系，为同一构造动力作用下产物，因而具有相近的成矿物质组分、成矿温度、成矿压力和相近的稳定同位素及稀土组成．这些矿床的差异仅表现在成矿围岩、矿体形态、矿体规模及产状、矿化特征、矿石自然形态等方面．这些差别主要是由于控矿控岩的构造作用、构造部位、断裂性质的差别以及构造—岩浆活动晚期所发生的构造驱动力和分异作用的差异所致．蚀变岩型矿床多发育在变形强烈的构造挤压、剪切部位，赋矿断裂产状多较缓，倾向ＮＷ，围岩蚀变发育；石英脉型矿床多出现在引张及剪张部位，赋矿断裂产状较陡，多倾向ＳＥ，围岩蚀变较弱；过渡类型矿床出现在两者之间．各矿化类型在垂向及侧向上都有着渐变过渡关系。

In northwest of Jiaodong,there are three kinds of gold deposits known as altered rock type,quartz vein type and transitional type,all called Linglong Jiaojia type of gold deposit.They have obviously relation of kindred and paragenesis,and were the products of the same tectonic dynamic action.So they have similar metallogenic materials,ore forming temperature, metallogenic pressure, stable isotope and REE component.These deposits were different in wall rock,orebody shape,orebody scale,occurence,mineralization feature,ore natural shape etc.They were caused by the differences of ore and rock controlling features,such as tectonics,tectonic position,fault nature,and tectonic power and differentiation happened in later stage of tectonic magmatic activity.Altered rock type deposit mostly developed in tectonic compression and shear position.The occurence of ore hosting fault was more gentle with NW dip.The wall rock was well altered.The quartz vein type deposit mostly developed in extension and shear tension position.The occurence of ore hosting fault was more steep with the SE dip.The wall rock was slightly altered.The transitional type deposit occured in the position between the above two.Various types of mineralization showed grading transitional relation in vertical and dip directions.The horizontal zoning of mineralization was obvious.