吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (6): 1769-1780.doi: 10.13278/j.cnki.jjuese.201606114
李福来1,2, 肖飞3, 孟凡超1,2, 任泽樱4
Li Fulai1,2, Xiao Fei3, Meng Fanchao1,2, Ren Zeying4
摘要: 内蒙古索伦地区上二叠统林西组沉积物源受控于晚古生代古亚洲洋的闭合事件。本文通过分析碎屑岩元素地球化学特征,对林西组母岩类型和古构造环境进行了探讨。常量元素分布特征表明,林西组早期属于风化程度较弱的第一次旋回沉积物,后期属于中等风化的第一次旋回沉积或再旋回沉积物,母岩类型以火成岩为主;微量元素和稀土元素分布特征表明,林西组母岩沉积环境为大陆岛弧背景下切割的岩浆弧,以上地壳碱性-中性火成岩为主,伴有钙质-泥质沉积岩,(Gd/Yb)n表明早期沉积母岩为太古宙碱性火成岩。综合分析表明,林西组沉积同时接受南侧华北板块北缘和北侧苏尼特左旗—锡林浩特—西乌旗南岩浆弧的共同物源供给,早期沉积有华北板块北缘太古宙基底母岩的参与。
中图分类号:
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