黄金科学技术 ›› 2022, Vol. 30 ›› Issue (5): 664-675.doi: 10.11872/j.issn.1005-2518.2022.05.169
Jia XING1(),Jianguo WANG1,2(),Zhinan WANG1,Jian HU1,Shengyun WEI1
摘要:
赛坝沟金矿是位于柴北缘乌兰—都兰战略性金属矿集区的中型金矿床之一,金矿床的形成受断裂系统的严格控制,矿体大多赋存于NW向脆—韧性剪切带内的英云闪长岩和辉长岩中,呈细脉状、分支脉状、不规则状和透镜状产出。赛坝沟金矿区出露的岩浆岩绝大多数为辉长岩类和花岗岩类,其中辉长岩与矿体在产出位置上表现出密切的空间相关性,且在矿区内发育的各类岩浆岩中,辉长岩的金含量远高于其他类型的岩浆岩,对其开展全岩元素分析显得尤为必要。分析结果显示:赛坝沟金矿区的辉长岩以碱性和亚碱性辉长岩为主,岩石全碱含量较高,Na、Al、Sr元素以及轻稀土元素(LREE)相对富集,Nb和Ti等稀有元素相对亏损。综合金矿地球化学特征分析,认为该矿区岩石岩浆起源为岩石圈地幔,在上涌过程中下地壳发生了底侵作用,促使深部初始岩浆房的形成,并在后续侵位到地壳浅部的演化过程中经历了一定程度的同化混染作用和较强的分离结晶作用。
中图分类号:
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