摘要
水泉沟岩体为岩浆成因,岩体的侵位深度2~3km,侵位时代为印支期,划分为4种岩石组合.水泉沟岩体是一个钾质-高钾质的钙碱性、弱碱性和碱性岩石共存的杂岩体.岩石化学成分变异图解证明岩浆存在两种演化趋势,一是酸性演化趋势:辉石闪长岩→角闪二长岩(包括二长岩)→石英碱长正长岩→碱长花岗岩;二是碱性演化趋势:正长岩→霓辉正长岩→碱长正长岩.同时也探讨了这两种演化趋势的内在机理.
Shuiquangou complex is of magmatic origin aged Indosinian epoch.The depth of the intrusive emplacement ranges 2~3km.Four associations and their types of rocks are newly devided.The petrochemical study on the whole complex proves that it is a potassic and high potassic complex consisting of calc alkaline,weakly alkaline and alkaline complex.The diagrams of their petrochemical variation show that the magma has two evolutionary trends:one is acid evolutionary trend(pyroxene diorite→amphibole monzonite→quartz alkali feldspar syenite→alkali feldspar granite),the other is alkaline evolutionary trend (syenite→aegirine augite syenite→alkali feldspar syenite).Its internal evolutionary mechanism is also probed simply.
关键词
杂岩体
岩石
岩浆演化
水泉沟
地质学
alkaline weakly alkaline complex petrology magmatic evloution Northern Hebei Shuiquangou