黄金科学技术 ›› 2018, Vol. 26 ›› Issue (5): 559-569.doi: 10.11872/j.issn.1005-2518.2018.05.559
Huanlong HU1,2(),Hongrui FAN1,2()
摘要:
金成色对于金矿研究是一个重要的参数,其受到成矿流体的pH值和Na/(Na+K)等因素的影响。成矿过程的水/岩相互作用过程往往控制着这些物理化学参数。焦家金矿以强烈的水/岩相互作用为特征,并且由于其Ⅰ号矿体和Ⅲ号矿体的围岩不同,导致水/岩相互作用存在差异。本文研究聚焦于焦家金矿Ⅰ号矿体和Ⅲ号矿体不同的水/岩相互作用对金成色的影响。通过镜下矿石矿物组合显微观察确定出产于Ⅰ号矿体和Ⅲ号矿体中多金属硫化物阶段(第Ⅲ成矿阶段)的银金矿,并利用电子探针分析第Ⅲ成矿阶段银金矿以及进行围岩蚀变矿物对平衡热力学计算,对影响金成色的pH和Na/(Na+K)进行探究后认为:(1)焦家金矿Ⅰ号矿体和Ⅲ号矿体中第Ⅲ成矿阶段银金矿金成色相近;(2)水/岩相互作用过程中,成矿流体受黄铁绢英岩和钾长石化花岗岩缓冲后导致pH和Na/(Na+K)发生一定的变化,但这2种变化对金成色的影响不大。
中图分类号:
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