吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (3): 743-758.doi: 10.13278/j.cnki.jjuese.201503109
姚磊1,2, 吕志成2,3, 于晓飞2,3, 庞振山2,3, 蔡煜琦4, 刘鹏5, 刘长城6, 王凤兰7
Yao Lei1,2, Lü Zhicheng2,3, Yu Xiaofei2,3, Pang Zhenshan2,3, Cai Yuqi4, Liu Peng5, Liu Changcheng6, Wang Fenglan7
摘要:
利用LA-ICP-MS锆石U-Pb法,测得与成矿有关的青海祁漫塔格地区虎头崖矿床Ⅵ矿带花岗岩的成岩年龄为(233.6±1.8) Ma(MSWD=1.2,n=17)。地球化学特征显示:花岗岩属高钾钙碱性、弱过铝质花岗岩;样品的稀土元素组成以总体右倾,轻、重稀土分异明显和具明显的负铕异常为特征;微量元素具有富集Rb、Th、U、La、Nd等大离子亲石元素,亏损Ba、Sr、Nb、P、Ti等元素的特点。Sr-Nd同位素组成特征显示,花岗岩的源区可能是富集岩石圈地幔。初步研究认为,虎头崖矿床Ⅵ矿带花岗岩可能形成于中、晚三叠世碰撞后碰撞的构造背景下。
中图分类号:
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