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Distribution of gold and silver and its relation with hypogene ore minerals in the Esperanza porphyry deposit, Antofagasta Region, Chile
Resource Geology ( IF 1.1 ) Pub Date : 2020-10-26 , DOI: 10.1111/rge.12250 Shoji Kojima 1 , María Constanza San Martín 1 , Toshiro Nagase 2 , Daisuke Nakashima 3 , Claudio Bisso 4 , Andrew Menzies 1, 5
Resource Geology ( IF 1.1 ) Pub Date : 2020-10-26 , DOI: 10.1111/rge.12250 Shoji Kojima 1 , María Constanza San Martín 1 , Toshiro Nagase 2 , Daisuke Nakashima 3 , Claudio Bisso 4 , Andrew Menzies 1, 5
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Modes of occurrence of Au‐ and Ag‐bearing phases and their relation with associated hypogene ore minerals were examined with the objective to elucidate Au‐Ag distribution at the Esperanza porphyry deposit in the Eocene Centinela copper belt, using ore‐microscope modal analysis, semi‐quantitative analyses by automated mineralogy, electron probe microanalysis, and secondary ion mass spectrometer. The Esperanza hypogene mineralization is characterized by early‐stage chalcopyrite‐rich veinlets in the potassic alteration zone and later polymetallic stage with tennantite and galena in the chlorite‐sericitic alteration zone. Only the early‐stage chalcopyrite contains fine‐grained electrum (Au68Ag32 ‐ Au81Ag19) and hessite (Ag2Te), and thus yields positive correlations in Cu vs. Au and Cu vs. Ag grades that are clearly recognized in the hypogene sulfide zone. The early‐stage chalcopyrite grains frequently exhibit polysynthetic twinning suggestive of inversion from intermediate solid solution. These features suggest that the fine‐grained electrum and hessite are products exsolved in the cooling process with the intermediate solid solution to chalcopyrite inversion. In contrast, tennantite and galena of the later‐stage mineralization contain no detectable Ag, and it is thus proposed that the early‐stage inverted chalcopyrite is the principal storage of economically important precious metals.
中文翻译：
智利安托法加斯塔地区埃斯佩兰萨斑岩矿床中金和银的分布及其与次生矿石矿物的关系
研究了含金和含银相的发生方式及其与相关的次生矿物矿物的关系，目的是通过矿石显微镜模态分析，半结晶法阐明始新世Centinela铜带埃斯佩兰萨斑岩矿床的金银分布。通过自动矿物学，电子探针微分析和二次离子质谱仪进行定量分析。埃斯佩兰萨次生矿化的特征是钾质蚀变带中的早期黄铜矿富集小脉，亚绿泥石蚀变带中的后期有ten石和方铅矿的多金属阶段。只有早期的黄铜矿包含细粒的电子（Au 68 Ag 32 ‐Au 81 Ag 19）和he石（Ag 2Te），因此在Cu vs.中产生正相关。Au和铜VS。在次生硫化物区清楚地识别出的Ag等级。早期的黄铜矿晶粒经常表现出多合成孪晶，表明从中间固溶体转化。这些特征表明，细粒的电子和铁矿是在冷却过程中溶解的产物，中间的固溶体转化为黄铜矿。相比之下，后期矿化的钙钛矿和方铅矿不含可检测的银，因此建议将早期倒黄铜矿作为具有重要经济意义的贵金属的主要储存地。
更新日期：2020-12-28
中文翻译：
智利安托法加斯塔地区埃斯佩兰萨斑岩矿床中金和银的分布及其与次生矿石矿物的关系
研究了含金和含银相的发生方式及其与相关的次生矿物矿物的关系，目的是通过矿石显微镜模态分析，半结晶法阐明始新世Centinela铜带埃斯佩兰萨斑岩矿床的金银分布。通过自动矿物学，电子探针微分析和二次离子质谱仪进行定量分析。埃斯佩兰萨次生矿化的特征是钾质蚀变带中的早期黄铜矿富集小脉，亚绿泥石蚀变带中的后期有ten石和方铅矿的多金属阶段。只有早期的黄铜矿包含细粒的电子（Au 68 Ag 32 ‐Au 81 Ag 19）和he石（Ag 2Te），因此在Cu vs.中产生正相关。Au和铜VS。在次生硫化物区清楚地识别出的Ag等级。早期的黄铜矿晶粒经常表现出多合成孪晶，表明从中间固溶体转化。这些特征表明，细粒的电子和铁矿是在冷却过程中溶解的产物，中间的固溶体转化为黄铜矿。相比之下，后期矿化的钙钛矿和方铅矿不含可检测的银，因此建议将早期倒黄铜矿作为具有重要经济意义的贵金属的主要储存地。
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