摘要
以野外地质为基础,结合岩石岩相学、岩石化学、稀土元素及微量元素地球化学等方面资料,对杨杖子杂岩体的岩石学特征、形成演化过程及构造环境等问题作了探讨。由闪长岩、花岗闪长岩、碱长花岗岩组成的杂岩体是下部地壳部分熔融形成的岩浆经分离结晶作用以及同化了钙、镁质围岩后的产物,其构造环境属于造山期后型。
Based on field geology combined with using the data of petrography,petrochemistry, geochemistry of REE and trace elements, the petrologicalcharacteristics, petrogenetic process and tectonic setting of the Yangzhangzimagmatic complex are discussed. The complex, composed of diorite, granodiorite,alkali feldspar granite, was sequentlally formed by three stages of magmaintrusions during early Yanshanian period. The magma, resulting from thepartial melting of old igneous rocks in the lower crust, has undergonefractional crystallization and mixed with Ca and Mg-rich country rocks. Thetectonic setting of the Yangzhangzi complex is of the POG (Post-OrogenicGranitoids)type.
关键词
闪长岩
花岗岩类
岩浆
杂岩
岩石学
diorite
granitoid
magmatic complex
petrology
petrogenesis
Hebei
