【摘要】 <正> 湘西桂东一带是华南金矿分布较集中,且伴生成矿元素组合类型较多的地区,比较典型者有湘西、西安、漠滨、龙山、桃花和龙水等金矿。 本文从实地考查及室内研究的资料和数据出发,讨论区内金的分布、来源、迁移富集过程和形式以及成矿作用等。 微量金数据除部分样品运用化学比色法外,主要采用化学浓集-发射光谱测定方法。实验结果表明,化学-光谱法测定微量金相对平均误差为18％;相对平均偏差重复性和再更多还原

【Abstract】 Six elemental groups in the gold deposits in the study region have been distinguished: （1） tungsten-antimony-gold; （2） tungsten-gold; （3） antimony-gold; （4） lead-zinc-silver-gold; （5） uranium-silver-gold; （6） simple gold. Discussed in the present paper are the distribution, source, mineralization, migration and concentration of gold. The results show that the ore-controlling strata or source beds related to gold deposits all show high background values of gold; the gold and other associated ore-forming elements are obviously derived from the country rocks. Mineralization is related chiefly to regional metamorphism in the ore-controlling strata, or alkali-pervasing metasomatism. During metamorphism in the ore-controlling strata, gold was released into solutions, and then transported and deposited in some localities. Gold carried in hydrothermal solutions occurs mainly in the form of Na [Au（SH）₂]. Native gold or electrum were precipitated from the ore solutions and conccntrated into ore deposits with the decrease of T, pH and fO₂.更多还原