水泉沟杂岩体的地质学和岩石学研究

GEOLOGY AND PETROLOGY OF SHUIQUANGOU COMPLEX,NORTHERN HEBEI PROVINCE

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.