摘要
冀东青龙太古宙花岗岩系由紫苏花岗岩类-花岗闪长岩-英云闪长岩组成,属于钙碱性铝正常型花岗岩.其微量元素Rb,Sr,Ba,Nb,Zr低于一般花岗岩,Ti和Cr高于一般花岗岩.轻重稀土分馏明显,∑REE及Ce,Y低于一般花岗岩,δEu=1.03~1.41,花岗岩系为中晚太古宙下地壳深融产物,属S型花岗岩,其侵位后遭受过变形变质.
The Archean granitoids in Qinglong,East Hebei consist of charnockitoid,granodioriteand tonalite.They are caf-alkaline granitoids,and their compostions can be comparable withTTG magma.Comparing with ordinary granite,the concentration of Rb,Sr,Ba,Nb and Zr islower,whereas that of Ti and Cr is higher.(Ce/Yb)N=8~24.The concentration of ∑REEand Ce,Y is lower than that of ordinary granite.δEu=1.03~1.41.The granitoids are generated in the lower crust by anatexis in middle-lower Archean.It shows the characteristics ofS-type granitoids.
关键词
紫苏花岗岩
花岗闪长岩
地球化学
花岗岩
charnockitoid
granodiorite
Archean
geochemistry
petrogenesis
tectonicenvironment
Hebei