黄金科学技术 ›› 2019, Vol. 27 ›› Issue (4): 489-496.doi: 10.11872/j.issn.1005-2518.2019.04.489
高云峰1(),杨兴科1(),阮仕琦1,韩珂1,张伟胜1,朱伟2
Yunfeng GAO1(),Xingke YANG1(),Shiqi RUAN1,Ke HAN1,Weisheng ZHANG1,Wei ZHU2
摘要:
镇安西部钨矿集区位于南秦岭构造带,区内出露地层主要为古生代碳酸盐岩,岩浆岩主要为胭脂坝、懒板凳和四海坪花岗岩体。区内断裂发育,为钨矿成矿提供了导矿构造和容矿构造。近EW走向断裂破碎带内出现了典型的矽卡岩型钨矿化,此外NE-NNE走向的石英脉型钨矿化同样发育,二者共同构成了本区的主要钨钼矿化类型。通过对矿集区棋盘沟和核桃坪等典型钨矿床进行野外调查及室内研究,取得以下认识:(1)矿集区内控矿构造为近EW向与NE-NNE向2组不同方向的构造裂隙;(2)根据该区构造背景,矿集区内NE-NNE构造裂隙是晚印支—燕山期构造活动形成的,近EW向构造裂隙则主要是印支期构造活动形成的,相对于燕山期钨钼成矿期近EW向断裂为成矿前构造,而NE-NNE向断裂裂隙属于成矿期构造;(3)矿集区内钨矿化类型以热液石英脉型和矽卡岩型为主,其中石英脉型主要受NE-NNE向断裂及节理裂隙控制,矽卡岩型主要受近EW向断裂破碎带控制。
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