吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (2): 443-460.doi: 10.13278/j.cnki.jjuese.201602112
严威1, 邱殿明2, 丁清峰1, 刘飞1
Yan Wei1, Qiu Dianming2, Ding Qingfeng1, Liu fei1
摘要：
对东昆仑造山带五龙沟地区的猴头沟二长花岗岩开展了详细的岩相学、地球化学、锆石U-Pb年龄及Hf同位素的分析测试和研究工作。LA-ICP-MS锆石U-Pb测年表明,猴头沟二长花岗岩的206Pb/238U加权平均年龄值为(419.0±1.9)Ma,属于晚志留世。岩石地球化学数据表明:猴头沟二长花岗岩属于高钾钙碱性系列的A2型花岗岩,富SiO2、K2O、Y(>33×10-6)和Yb,贫Al2O3和Sr(<100×10-6),具有强烈的负铕异常;Rb、Th、U、La、Ce、Nd相对富集,Nb、Ta、Ba、Sr、P、Ti亏损。锆石的Hf同位素研究表明,其εHf(t)值为0.2~5.1,对应二阶段模式年龄(TDM2)为1066~1371 Ma,由此推测花岗岩源区来自中元古代镁铁质下地壳部分熔融。微量元素及其特征比值的构造判别图解表明,猴头沟二长花岗岩形成于早古生代晚志留世东昆仑造山旋回的造山后伸展阶段。据此认为,原特提斯洋在东昆仑地区的最晚闭合时限应该不晚于晚志留世末期(~419 Ma),而不是前人认为的早泥盆世。
中图分类号:
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