滇中大红山岩群变质火山岩类的原岩性质和构造属性

大红山岩群中的变质火山岩类经在了区域性的海水蚀变和区域变质的改造，其岩石学特征和化学成分都发生了较大的变化，不活动组分的研究显示，其原岩主查拉斑玄武岩类，且具有形成于洋中脊环境的地球化学特征，可能属于Ｔ型地幔源区的洋中脊玄武岩（ＭＯＲＢ）大红山式Ｃｕ－Ｆｅ矿床具有富洋壳成矿元素特性，与所识别的变质火山岩类的原岩和形成的大地构造背景是一致的。

ORIGINAL PETROLOGY AND TECTONIC SETTING OF META-VOLCANIC ROCKS FROM DAHONGSHAN GROUP, CENTRAL YUNNAN

The meta-volcanic rocks in Dehongshan Group have been subjected to both regionally hydrothermal alteration of sea-water and regional metamorphism, so these rocks were changed in petrographic feature and chemical composition. Studies of immobile elements in the rocks show that these meta-volcanic rocks were tholeiite originally, and have geochemical characteristics of mid-ocean ridge environment,belonging to T-type MORB. The Cu-Fe mineralization of Dahongshan type in the rock group, which was rich in the metallogenic elements from the ocean crust,is in keeping with the original petrology and tectonic setting of these meta-volcanic rocks.