黄金科学技术 ›› 2022, Vol. 30 ›› Issue (6): 809-821.doi: 10.11872/j.issn.1005-2518.2022.06.178
• 矿产勘查与资源评价 • 下一篇
王建国1,2(),张世珍3(
),邢佳1,王志男1,魏生云1,胡建1
Jianguo WANG1,2(),Shizhen ZHANG3(
),Jia XING1,Zhinan WANG1,Shengyun WEI1,Jian HU1
摘要:
伟晶岩型矿床是稀有金属矿产的主要来源之一,我国西部地区的稀有金属矿床也以伟晶岩型为典型。柴达木盆地北缘乌兰茶卡北山地区岩浆活动频繁,伟晶岩体发育,具有形成稀有金属矿床的良好条件。为了进一步了解伟晶岩的地球化学特征,加深对区域构造演化以及稀有金属成矿和控矿条件的认识,选择该地区含矿伟晶岩作为研究对象,通过分析岩石矿物组合、岩相学特征、主微量及稀土元素组成,解释了侵入古元古界达肯大坂岩群中的伟晶岩地球化学特征。研究发现样品全碱含量较高,这与形成于大陆弧或板块碰撞环境下的成岩特征相似。稀土配分曲线为右倾型,轻重稀土分馏明显,具有Eu中等负异常,推测含矿伟晶岩源区不仅与地壳有关,而且还具有幔源镁铁质岩浆参与的可能性。研究结果表明:研究区内含矿伟晶岩属于亚碱性岩石类型,轻稀土元素富集,重稀土元素亏损,分馏程度较高,反映出在岩浆演化及伟晶岩成岩过程中幔源物质可能参与了稀有稀土金属的成矿作用。研究认为伟晶岩的物质来源不仅与地壳有关,而且还有幔源物质的参与,推断含矿伟晶岩的地质构造环境可能为后碰撞或碰撞后伸展环境。
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