北淮阳花岗岩-正长岩带地球化学特征及其大地构造意义  

GEOCHEMISTRY OF THE NORTH HUAIYANG GRANITE-SYENITE ZONE AND ITS TECTONIC IMPLICATION

作　　者：周泰禧[1] 陈江峰[1] 张巽[1] 李学明[1] 

机构地区：[1]中国科学技术大学

出　　处：《地质论评》1995年第2期144-151,共8页Geological Review

摘　　要：采用岩石化学、稀土元素和锶、钕、铅同位素方法对安徽省西部沿金寨、霍山、舒城一线出露的花岗岩-正长岩类岩石的研究表明,古老地壳岩石在它们的形成过程中起了重要作用,而且它们的同位素组成特征与华北板块基底岩石相近。因此,该岩带出露区的大地构造位置应归属华北板块。岩体的地质产状、岩石化学特征和侵位时代表明,它们是白垩纪时拉张环境下的产物。Granites-syenites occurring in Jinzhai, Huoshan and Shucheng, western Anhui Province, have been studied by means of major element, REE and Sr, Nd and Pb isotopic methods. The results show that old crustal materials played an important role in their formation of these rocks are similar to that of the basement rocks of the North China plate. Therefore, the intrusions are located in the North China plate tectonically. Modes of occurrence, petrochemical features and emplacement ages of the intrusions indicate that they were formed in an extensional environment during the Cretaceous.

关 键 词：花岗岩 正长岩 大地构造位置 地球化学 

分 类 号：P588.121[天文地球—岩石学] P595[天文地球—地质学]