【摘要】 <正> 七十年代以来,由于理解到早前寒武纪的花岗质岩石在地壳生长和演化过程中的重要作用而对其进行日益深入的研究。其中许多研究工作,都集中在西格陵兰、北美、南部非洲、西澳大利亚及芬兰的太古代克拉通上。迁安英云闪长岩-花岗闪长岩质片麻岩,出露在河北省迁安县的蟒山、龙虎山、塔山、石佛寺和青山院大贤庄一带,构成迁安断块隆起的核心。它的出现,标志着冀东太古代早元古代地壳演化中的大的地质阶段,因而引起研究者的注意(张贻侠等,1979)。更多还原

【Abstract】 The Archaean Qianan complex is located in the centre of Qianan dome in Eastern He-bei Province. The rocks are mainly composed of tonalite-granodioritic complex, among which some show gneissic structure.The REE patterns of the complex, together with other trace-element characteristics, imply that partial melting of metabasalt in lower crust had produced tonalite-granodiritic parental magma. The smoothly continuous trend on the chemical variation diagrams and the close similarity and regurlar variation of the REE patterns indicate that the complex constitutes a series of co-magmatic rocks and appears to be related to fractional crystallization.更多还原