吉林大学学报(地球科学版) ›› 2021, Vol. 51 ›› Issue (6): 1753-1769.doi: 10.13278/j.cnki.jjuese.20210073
宫昀迪1, 李碧乐1, 李治华1, 于润涛1, 孙永刚1, 张森2
Gong Yundi1, Li Bile1, Li Zhihua1, Yu Runtao1, Sun Yonggang1, Zhang Sen2
摘要： 为了探讨大兴安岭北段小柯勒河花岗斑岩脉的岩石成因、构造背景及地质意义，本文对其进行了锆石U-Pb年代学、岩石地球化学与Hf同位素的研究。岩石地球化学结果显示：花岗斑岩富硅（w（SiO2）为69.85%~70.48%）、富碱（w（Na2O+K2O）为9.74%~9.89%），贫镁（w（MgO）为0.34%~0.40%）、贫钙（w（CaO）为1.04%~1.20%），A/CNK为0.98~1.02，属于准铝质-弱过铝质系列岩石；具有轻稀土元素富集和重稀土元素亏损的特征，中等Eu负异常，富集大离子亲石元素Rb、K和高场强元素Th、U、Hf、Zr，亏损大离子亲石元素Sr、Ba和高场强元素Nb、Ta、Ti、P。花岗斑岩中的104Ga/Al值为2.32~3.68，分异指数ID为87.63~89.01。综合分析认为小柯勒河花岗斑岩属于分异的I型花岗岩。花岗斑岩锆石U-Pb加权平均年龄为（124.0±0.6）Ma，属于早白垩世晚期。锆石εHf（t）值为0.5~3.3，二阶段Hf同位素模式年龄TDM2为1 150~970 Ma。结合岩石地球化学特征分析认为花岗斑岩源岩为由亏损地幔衍生的中-新元古代新增生地壳部分熔融的产物，并有少量古老地壳物质的加入。该花岗斑岩形成于早白垩世晚期蒙古-鄂霍茨克洋闭合背景下的伸展环境，此时太平洋板块持续向欧亚大陆俯冲，但对本区影响有限。
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