吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (5): 1436-1446.doi: 10.13278/j.cnki.jjuese.201505115
付长亮1, 孙德有2, 魏红艳1, 苟军2
Fu Changliang1, Sun Deyou2, Wei Hongyan1, Gou Jun2
摘要:
珲春小西南岔地区白垩纪花岗岩主要有英云闪长岩和花岗闪长岩两种类型。英云闪长岩属于中钾钙碱性系列(Na2O/K2O=1.99~2.76),具有高Al2O3(15.46%~17.13%)、Sr(559×10-6~731×10-6)、Sr/Y(40~78)、La/Yb(16~21),低Y(9×10-6~14×10-6)、Yb(0.8×10-6~1.3×10-6)的特征,与埃达克质岩石地球化学特征类似。花岗闪长岩为高钾钙碱性系列,Na2O/K2O=1.01~1.56,w(Sr)=312×10-6~410×10-6、w(Yb)=1.23×10-6~2.13×10-6、Sr/Y=13~32,属正常的高钾钙碱性花岗岩。两类花岗岩的源区均为玄武质下地壳物质,英云闪长质岩浆形成压力较高(> 1.0 GPa),深度大于33 km,花岗闪长质岩浆形成压力相对较低(0.8~1.0 GPa),岩浆来源深度为26~33 km。
中图分类号:
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