吉林大学学报(地球科学版) ›› 2018, Vol. 48 ›› Issue (6): 1741-1755.doi: 10.13278/j.cnki.jjuese.20170299
• 地质与资源 • 上一篇
尹志刚1, 李海娜1, 张海2, 郝科1, 庞学昌1, 宫兆民1, 李敏1, 张圣听1
Yin Zhigang1, Li Haina1, Zhang Hai2, Hao Ke1, Pang Xuechang1, Gong Zhaomin1, Li Min1, Zhang Shengting1
摘要: 研究区位于大兴安岭兴安地块的东北部。本文主要讨论了碱长花岗岩和花岗斑岩两种岩石类型,并对其成岩年代、地球化学特征、成因及构造环境进行了深入讨论。研究结果显示:具有高SiO2、A12O3、TFeO/MgO,贫MgO、TiO2、P2O5等特征;A/NK-A/CNK和w(K2O)-w(SiO2)图解显示,样品主要为过铝质、高钾钙碱性岩石。并且(Na2O+K2O)/CaO-w(Zr+Nb+Ce+Y)、TFeO/MgO-w(Zr+Nb+Ce+Y)图解和锆石饱和温度都显示,研究区花岗岩类岩石具有高分异Ⅰ型花岗岩的特征。锆石LA-ICP-MS U-Pb定年研究获得128~124 Ma的岩体侵位年龄,其形成的大地构造背景为蒙古-鄂霍茨克洋消亡之后,陆陆碰撞造山演化晚期地壳伸展背景,岩浆起源于壳内火成岩源岩的部分熔融。
中图分类号:
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