菲律宾达沃砂金矿中金汞矿物研究及其找矿意义

本文系统研究了菲律宾棉兰老岛达沃砂金矿的矿物组合、金汞矿物的矿物学特征,认为随着金汞矿物中汞含量成分增加,金-汞系列矿物反射力具有由强-弱-强的变化特征,同时矿物硬度也随着减少。但是,当汞含量增加到相当比例时,尤其是晶体结构为等轴晶系时,其硬度却逐渐变大。笔者研究发现,金汞齐和r-汞金矿只是作为自然金或含汞自然金的矿物...

Mineralogical Characteristics of Gold-mercury Mineral in the Davao Gold Placer of Mindanao Islands, Philippines and Its Prospecting significance

Abstract:Mineral assemblage and mineralogical characteristics of gold-mercury minerals in the Davao Placer of Mindanao Islands, Philippines were systematically studied in this paper. Results show that, with the increasing mercury content in gold-mercury minerals, their reflecting power exhibits variations in the sequence of strong ? weak ? strong, in contrast to the decrease of mineral hardness. However, when the content of mercury reaches a definite proportion, especially when the crystal displays isometric crystal texture, its hardness increases. We also find that goldmalgam and r-goldmalgamite just occur as natural edge of gold-mercury mineral grains. Overall, mercury content gradually reduces from the edge to the centre of gold-mercury mineral particles, but that in the edge of grains is lower than that in the middle. With a combination of the analysis of metallogenetic background, this paper suggests that there are mantle-derived platinum and chromium deposits in the region, which are accompanied by ultramafic-mafic magmatism, and large and ultra-large scale gold, mercury-polymetallic deposits, as well as coastal placer of gold and platinum are also likely.