黄金科学技术 ›› 2022, Vol. 30 ›› Issue (2): 165-178.doi: 10.11872/j.issn.1005-2518.2022.02.061
陈振1(),王翠芝1(),吕古贤2,张宝林3,张启鹏4,魏竣滨4,史晓鸣4
Zhen CHEN1(),Cuizhi WANG1(),Guxian LV2,Baolin ZHANG3,Qipeng ZHANG4,Junbin WEI4,Xiaoming SHI4
摘要:
柴胡栏子金矿目前保有储量已不能满足金矿持续生产的需要,应开展进一步深边部找矿工作。基于成因矿物学理论,采用矿物地球化学方法对矿区内黄铁矿化学成分标型特征进行了研究。结果表明:(1)黄铁矿中Co/Ni元素比值和As-Co-Ni元素三角图解显示,柴胡栏子金矿黄铁矿成因较复杂,受建平群、区域变质和岩浆热液活动等诸多因素的制约;(2)黄铁矿中Au/Ag和S/Se等特征值显示出岩浆热液特征,表明成矿流体的形成主要与矿区岩浆活动有关;(3)黄铁矿晶体中的金以纳米微粒金存在,因纳米金具有较强的迁移性以及被碳质吸附的特性,因此矿区含碳质较高的绢云母化含石墨斜长片麻岩是最有利的赋矿围岩。依据矿区黄铁矿成分特征,结合区域地质、矿区地质及蚀变带特征,得出柴胡栏子金矿形成受诸多因素的联合控制,矿区基性岩脉侵入活动是重要的因素,基性岩脉不仅带来部分矿源,而且其携带的岩浆热液使建平群中的金(这部分金已在区域变质过程中得到活化)进一步活化而进入成矿流体中,在NNE向挤压构造带和NWW向张性裂隙构造带的交会部位,成矿流体与围岩广泛交代形成以蚀变岩型为主的金矿床,矿区东南部深部建平群老变质岩地层具有较好的找矿前景,尤其是绢云母化含石墨斜长片麻岩中的构造发育部位。
中图分类号:
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