吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (4): 1059-1074.doi: 10.13278/j.cnki.jjuese.20180228
• 地质与资源 • 上一篇
任文恺1,2, 王生云3, 陈礼标1,2, 吴少锋1,2, 张海青1,2
Ren Wenkai1,2, Wang Shengyun3, Chen Libiao1,2, Wu Shaofeng1,2, Zhang Haiqing1,2
摘要： 西秦岭造山带发育北西向展布的同仁—泽库构造岩浆岩带，位于青海同仁县以西兰采地区的花岗闪长岩是该构造岩浆岩带的一部分。本文对兰采地区的花岗闪长岩进行了LA-ICP-MS锆石U-Pb年代学及地球化学特征研究。结果表明：兰采地区花岗闪长岩的结晶年龄为（231.4±2.9） Ma （MSWD=0.024），即形成于晚三叠世早期；稀土元素总量为138.76×10-6~197.19×10-6，具有右倾的稀土元素配分模式，富集轻稀土而亏损重稀土（（La/Yb）N值为11.53~17.19），Eu具有负异常；富集Rb、K、Th、U等大离子亲石元素，相对亏损Nb、Ta、Ti等高场强元素，Sr、Ba、P呈明显负异常，属于准铝质、高钾钙碱性系列I型花岗岩类。结合区域地质及前人研究成果，认为兰采地区花岗闪长岩的源区物质为变基性岩类，幔源岩浆的参与可能对该岩体的形成具有重要意义，形成于以整体挤压为主、局部剪切伸展为辅的地壳逐渐加厚的动力学背景下。
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