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使用布鲁克海文国家实验室的同步辐射光源,以同步辐射X射线荧光法(SXRF)分析了内华达卡林型金矿床两个未氧化样品中的所谓不可见金的产状。这两个样品一个是卡林矿床东矿带的层状样品,另一个是马谷(Horse Canyon)的角砾岩样品。初步结果表明金仅见于马谷的角砾岩样品中。本文讨论了有关实验的细节,包括其他X光谱线和衍射峰的干扰以及所用标样和最低检测限等。 金的最低检测限在0.8—3ppm的范围内。除了在一个颗粒的多孔部分外在自形黄铁矿晶体中未测出,而在基质的某些部分却测出有金。含金相尚未知。迄今测得的最高金含量约为40ppm。这些新发现颇具实际意义。
Synchrotron radiation X-ray fluorescence (SXRF) was used to analyze the so-called invisible gold formation in two unoxidized samples of the Nevada Carlin-type gold deposit, using a synchrotron radiation source from Brookhaven National Laboratory. One of the two samples is a stratiform sample of the eastern Carlin deposit and the other is a breccia sample of the Horse Canyon. Preliminary results indicate that gold is found only in breccia samples from Magu. This article discusses the details of the experiment, including the interference of other X-ray lines and diffraction peaks, the standards used, and the minimum detection limits. The minimum detection limit of gold is in the range of 0.8-3ppm. Except in the porous part of one particle in the crystal of self-shaped pyrite not detected, but in some parts of the matrix was measured gold. Metallography is unknown. The highest gold content so far measured is about 40 ppm. These new findings have real meaning.