摘要
本文应用EPMA、SEM/EDX,TEM/EDX等分析技术对卡林型金矿中超微金的赋存状态进行了研究,并对这些分析技术及其对金矿的测量方法的特点进行了讨论。通过对金赋存状态的电子显微分析,揭示出所谓“不可见金”是由一系列超微金颗粒(大约3mm至几μm)所组成,它们被包裹于黄铁矿、含砷黄铁矿中,并首次观察到3nm的超微金矿物,这为人们正确评价超微金的赋存状态提供了重要依据。
The occurrence of ultramicro gold in certain carlin-type gold ore has been studied bymeans of EPMA, SEM/EDX and STEM/EDX in this paper. The features of these analytical tech-niques and some measures taken to analysing the gold ore are discussed. Application of this combinedtechniques to study on gold occurrence successfully shows that the so-called 'invisible' gold is com-posed of a series of ultramicro gold particles (about 3nm to a few um in size) encapsulated common-ly in pyrite, arsenic pyrite and clay minerals etc. A 3nm in size ultramicro gold particle has beenobserved for the first time, and that provides the key knowledge for evaluating the gold occurrence.
关键词
超显微金
电子显微分析
矿物
ultramicro gold
electron microscopic analysis
