新疆辉长岩类及其含矿性

新疆辉长岩类按成因、共生组合及岩石特征划分为幔源(包括蛇绿岩类、铜镍硫化物类、层状杂岩类)、壳幔混合源(包括造山花岗岩类、变质成因类、裂谷类)、深源碱性等3个系列,再细分为7个类型,14个岩石序列.文中对各类型辉长岩的特征和含矿性进行了叙述.指出其里特曼指数、固结指数、Mg/(Fe)、Mg/Ca″、K_2O、TiO_2+P_2O_5等方面的鉴别特征.

THE GABBROITE AND ITS ORE POTENTIALITY IN XINJIANG

The outcrop area of gabbroite in Xinjiang amounts tp 1383km2. According to genesis, paragenetic associations and lithological features, the gabbroite may be divided into the mantle-derived series ( including ophiolite type, Cu-Ni sulphide type and layered complex type) , the mixing mantle-crust derived series ( including oro-genic granite type, metamorphogenetic type, rift type ) and the deep-seated source alkaline series. In the Al-(Fe+Ti)-Mg diagram, the mantle-derived series is distributed over the Mg-tholeiitic series area, the mixing mantle-crust derived series over the Calci-alkali series area, but the deep-seated source alkaline series over the alkaline series area. The differences between the various gabbro He in the alkalinity, the Mg/(Fe). the Mg/Ca, the coefficient of consolidation, the coefficient of Rittman and the content of K, Ti, P. The ore potentiality of each gabbro is different. The Cu-Ni sulphide type and the deep-seated source alkaline series are of the most significance in prospecting.