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在基性、超基性岩中有一些巨大的层状侵入体,它们与围岩多呈平行不整合或小角度相交关系,岩体厚度很大,往往超过数百米甚致数千米。巨厚的岩体由一系列互有联系的岩石类型组成。在垂向上,无论从整个岩系或局部来看,组成岩石的矿物的种类、数量、同种矿物的化学成分,都有明显的韵律性变化,往往可以组成几个至几十个大的韵律旋回。这种具有韵律性变化的层状岩体,被认为是岩浆结晶分异作用形成的“重力成层”。在一个巨大的岩浆渊中,先晶出的矿物晶体因重力分选作用依次下沉到岩浆渊底部,然后被晶体周围的残
There are some massive stratiform invaders in the basic and ultrabasic rocks. They are mostly parallel unconformities or intersections with the surrounding rock. The rock mass is very thick and often exceeds several hundred meters and even several kilometers. Thick rock mass consists of a series of interlinked rock types. Vertically, there are obvious rhythmic changes in the type and amount of the minerals that make up the rock, and the chemical composition of the same kind of minerals, whether from the whole rock system or from the part of the earth, and can often form several to several tens large rhythms Swing. This kind of layered rock with rhythmic changes is considered as “gravitational stratification” formed by the differentiation of magma crystals. In a huge magma, mineral crystals first crystallized by gravity separation in turn down to the bottom of the magma, and then by the residual crystal around