呼延钰莹;路玉;

• 1:西北大学地质系
• 2:西北大学大陆动力学国家重点实验室
• 3:中国石油大学(北京)
• 4:中国地质大学(北京)

摘要(Abstract)：

熊耳群火山岩是华北陆块结晶基底形成后规模最大、涉及范围最广的火山活动产物,其时代归属一直存在争议。研究获得小秦岭地区熊耳群火山岩LA-ICP-MS锆石207Pb/206Pb年龄加权平均值为(1 810±41)Ma(MSWD=0.16)。综合河南和山西等地熊耳群火山岩测年结果,笔者认为熊耳群火山岩的时限很可能为1.81~1.75Ga,属于哥伦比亚超大陆碰撞作用晚期。该套火山岩主要由玄武安山岩和安山岩组成,具有较高的K_2O、FeO和低的A1_2O_3、MgO、CaO含量,反映岩石具有高钾弱碱性的特点;岩石的稀土元素总量高,REE分配曲线呈右倾型,具轻微Eu负异常;富集大离子亲石元素(K、Rb、Ba),亏损高场强元素(Nb、Ta、Ti)。火山岩具有与"岛弧型"相似的稀土和微量元素特征,为典型的俯冲成因类型。

关键词(KeyWords)： 熊耳群火山岩;U-Pb锆石;华北克拉通;哥伦比亚超大陆

Abstract:

Keywords:

基金项目(Foundation): 国家基础科学人才培养基金地质学科学研究培训项目(XDCX2013-14);; 2013年国家大学生创新与训练计划(201310697022)

作者(Author): 呼延钰莹;路玉;

Email:

DOI:

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