吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (5): 1405-1417.doi: 10.13278/j.cnki.jjuese.201505113
魏启荣, 刘小念, 丁鹏飞, 王程, 王敬元, 孙骥, 张小强, 卜涛, 高满新
Wei Qirong, Liu Xiaonian, Ding Pengfei, Wang Cheng, Wang Jingyuan, Sun Ji, Zhang Xiaoqiang, Bu Tao, Gao Manxin
摘要:
扎扎龙矿区位于西藏冈底斯中段,隆格尔念青唐古拉铁、铜、铅、锌、银成矿带之西段。岩石学、LA-ICP-MS锆石U-Pb测年及岩石地球化学特征研究显示:扎扎龙矿区闪长岩体的岩石类型主要为闪长岩,个别为石英闪长岩,其LA-ICP-MS锆石U-Pb年龄为(64.15±0.52) Ma,形成于古新世(E1)早期;闪长岩体属准铝质过铝质岩石(A/CNK值为0.89~1.06),具高钾钙碱性系列的特征;稀土元素表现为轻稀土弱富集的右倾斜型,绝大多数(La/Yb)N为1.78~2.08,具弱的负铕异常(δEu=0.65~0.81);微量元素普遍表现出K、Th元素的富集和Nb、P、Ti元素的强烈亏损。扎扎龙闪长岩体源区为壳幔混合源区,形成于雅鲁藏布江洋高角度俯冲阶段,暗示了印度-亚洲大陆碰撞时间应晚于65 Ma。
中图分类号:
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