水口山矿田花岗质潜火山杂岩的成因特征

THE CHARACTERISTIC AND PETR0GENESIS OF THE GRANITIC SUBVOLCANIC COMPLEX IN THE SHUIKOUSHAN OREFIELD

水口山矿田内发育的花岗质岩石并非是互不联系的单体，而是一套由地下火山作用一潜火山作用在特定的构造条件和不同深度环境下，以不同方式形成的并规律结合的岩浆岩组合──花岗质潜火山杂岩。包括浅成（超浅成）侵入的花岗闪长质岩石、次火山侵入的英安份岩质岩石及其伴生的隐爆碎屑岩类。老鸦巢Ⅳ号角砾岩是英安玢岩质母岩浆在超浅成环境下隐蔽爆破而形成的隐爆角砾岩，它至少存在三条标志以区别于其它各类角砾岩。这套潜火山杂岩具过渡性地质地球化学特征。

The set of granitic rocks in the Shuikoushan orefield are formed and regularly combined into a set of the magmatic rock assemblage-the granitic subvolcanic complex as a result of underground volcanism-subvolcanism by different depths. They are composed supergene ultraepithermal instrusive granodiorite subvolcanic instrusive dicite-porphry and the cryto explosive clastics. Laoyachao crypto-explosive breccia should be determined, and now, at least there are three evidences for the destinction from all other breccias. The subvolcanic complex in the orefield has the transitional characteristic in geology, petrology and geochemistry.