张八岭构造带两种类型金矿次显微金赋存状态的质子探针分析

PROTON MICROPROBE ANALYSES OF OCCURRING FORMS OF “INVISIBLE” GOLD IN THE TWO TYPES OF GOLD ORES IN THE ZHANGBALING TECTONIC ZONES

金属硫化物中次显微金的赋存状态已引起人们的重视。张八岭构造带蚀变构造岩型和石英脉型两类金矿金属硫化物中次显微金质子探针分析显示 ,Au与As、Fe、S、Cu、Pb呈正相关关系 ,Au以显微包裹体形式存在于金属硫化物中。与蚀变构造岩型金矿相比 ,晚期的石英脉型金矿可见自然金含量较高 ,硫化物中显微包裹体金含量较低 ,可能预示中低温热液金矿中 ,不仅普遍存在时空分异的金属硫化物中的类质同象金和自然金 ,还可能存在一定程度的时空分异的自然金和次显微包裹体金。

Geologists have paid attention to the nature of “invisible” sulfide-hosted gold. The results of proton microprobe analyses of “invisible” gold in sulfides from two types of gold deposits in the Zhangbaling tectonic belt showed that the contents of “invisible” gold are positively correlative with those of As, Fe, S, Cu and Pb. The “invisible” gold in sulfides is present in the form of microscopic inclusions. The quartz-vein-type gold deposits are richer in native gold and poorer in “invisible” gold than the alteration-tectononite-type gold deposits. This indicates that it may be a rule that the existence of both native and microscopic inclusion-hosted gold for microthermal-mesothermal gold deposits. The native gold is generally separated from microscopic inclusion-hosted gold to some extent.