吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (3): 820-831.doi: 10.13278/j.cnki.jjuese.201503114
董福湘1, 曹家鑫2, 于红玉3, 闫攀攀4
Dong Fuxiang1, Cao Jiaxin2, Yu Hongyu3, Yan Panpan4
摘要:
秦皇岛柳江地区辉绿岩脉主要分布于碳酸盐岩出露区的亮甲山、石门寨、潮水峪西北、砂锅店东北、揣庄北、石岭西北、鸡冠山等地,且多以脉状,岩墙、岩床等形式产出。对柳江地区辉绿岩常量元素的分析表明:w(SiO2)变化较大,且平均值较低;w(FeO+Fe2O3)平均值比基性岩类略偏高;w(Al2O3)、w(CaO)、w(MgO)、w(K2O+Na2O)的平均值均在基性岩类平均值范围内;w(TiO2)的平均值为1.53%。微量元素富集高场强元素Ta、Nb、Zr、Hf,La/Nb>1,表明岩浆上升过程中受到地壳不同程度的混染;稀土元素球粒陨石标准化分布型图各样品基本一致,呈右倾,稀土元素总量较高,轻稀土较重稀土富集,无明显的Eu异常,反映出岩浆演化过程中分离结晶作用并不明显,样品之间的稀土分馏程度相同。分析结果与研究区辉绿岩的岩相学特征相结合,表明柳江地区辉绿岩属于钾玄岩系列,来自于板内环境。结合研究区大地构造背景,认为研究区辉绿岩脉是钾玄质系列玄武质岩浆沿早期断裂或岩层层面灌入冷凝而形成。
中图分类号:
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