山西塔儿山—二峰山碱性偏碱性杂岩体侵入期次及岩石化学特征

The Intrusion Periods and Petrochemical Features of Alkalic and Alkalescent Complex in Ta'ershan Mountain-Erfengshan Mountain of Shanxi Pprovince

通过对塔儿山—二峰山碱性偏碱性杂岩体各类岩石的野外地质特征和岩石化学研究,认为岩浆岩侵入顺序为闪长岩类→正长岩类→二长岩类→花岗岩→脉岩类。源区岩浆经历了钙碱性→偏碱性→碱性的演化系列。Al2O3、TFe2O3、Na2O+K2O、MgO质量分数呈现与SiO2相反的演化特点。岩浆源区随岩浆演化由上地幔到地壳逐渐变浅。

Through researching the field geological properties and petrochemical features of different types of rocks of alkalic and alkalescent complex in Ta＇ershan Mountain-Erfengshan Mountain,this paper holds that the intrusion sequence of pyrogenic rock is dioritoid→syenitoid→monzonite→granite→phlebite,the source region rock-magma had gone through the evolutionary series of calc -alkali magma →alkalescent magma →alkalic magma,and the contents of Al2O3,TFe2O3,Na2O＋K2O and MgO had presented the evaluative features contrary to SiO2,and the source region of rock-magma was becoming light gradually from upper mantle to earth crust along with the evaluation of the rock-magma.