东秦岭裂陷槽燕山期中酸性侵入岩及其成矿专属性

Yanshan Epoch Acidic Intrusive Rock of Eastern Qinling Chasmic Trough and Its Mineralization

不同的岩体形成不同类型的矿产资源,是岩浆岩成矿专属性的一个重要特征,在地质找矿方面具实际意义。东秦岭裂陷槽燕山期中酸性侵入岩主要以其Si O2含量分为酸性(稍偏碱)花岗岩系列(为主),次为中酸性的花岗闪长斑岩及石英闪长岩甚至闪长岩系列;总的规律是,前者与钼、铜的成矿,后者与铅锌铁银的成矿关系均较密切,中间类型为渐变过渡,充分反映出岩浆岩成矿专属性,而且体现了板块伸展运动中地幔柱形成期间岩浆正向演化及其成矿作用序列。

The Yanshan epoch mid-acidic intrusive rock in Eastern Qinling chasmic trough can be divided into mainly acid granite series, and a few acidic granite diorite porphyry, quartz diorite and diorite series, according to the SiO2 content. The general roles are that the former is elosely related with the mineralization of molybdenum and copper, and the latter is main- ly related with the mineralization of lead and zinc, iron and silver, while the intermediate type is the gradual transition in mineralization. All these indicate the particular feature of magma mineralization, and magma evolution and the mineraliza- tion sequence in the shaping of mantle plume during the period of plate extension motion.