黄金科学技术 ›› 2023, Vol. 31 ›› Issue (3): 408-422.doi: 10.11872/j.issn.1005-2518.2023.03.102
Shengyun WEI1(),Jianguo WANG1(
),Xuezhong GUO2,Jia XING1
摘要:
柴北缘夏日达乌铌钽矿区分布有大量早古生代花岗岩,剖析花岗岩的岩浆来源、形成机制和构造环境,对于揭示柴北缘陆壳的形成与演化机制具有重要作用。对柴北缘夏日达乌铌钽矿区花岗岩进行了岩石学和地球化学特征分析,结果表明:夏日达乌地区黑云母花岗斑岩主量元素具有高硅、高钾、富铝以及低镁、贫锰、少钛的特征;富集轻稀土元素,相对亏损重稀土元素,REE球粒陨石标准化配分曲线呈“V”字形分布,具有明显负Eu异常;相对富集大离子亲石元素,相对亏损高场强元素。岩石成因属于高分异S型过铝质花岗岩,其中物源主要由地壳物质发生低温熔融所提供,不排除地幔物质的混染;推断花岗岩形成于碰撞造山向板内过渡的碰撞构造环境。
中图分类号:
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