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
