石泉县羊坪湾金矿床成矿模式及其找矿模型
Metallogenic Model and Exploration Pattern of Yangpingwan Gold Deposit, Shiquan County, Shaanxi Province, China
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摘要: 对羊坪湾金矿床的地质地球化学特征研究表明,该金矿床为陕南黑色岩系中发现的沉积-改造型金矿床。它的成矿作用经历了沉积-成岩、构造-变质和改造-就位三个主要阶段;其找矿模型为在志留系梅子垭组含碳二云母石英片岩这一层位,韧性剪切带、紧闭褶皱等地质构造发育地段,出现黄铁矿化、硅化等热液蚀变和石英细脉、钠长岩脉等脉体,具有Au、As等元素化探异常与弱的激电异常,表现出断续的线性遥感影像。Abstract: The geological and geochemical characteristics research of Yangpingwan gold deposit indicate that it belongs to sedimentary-reformed deposit discovered in black rock series of southern Shaanxi Province. The metallogensis of this deposit undergoes three major stages, namely sedimentary and diagenesis, formation and metamorphism, reformation and emplacement. The gold deposit can be explored in stratigraphy of carbon-bearing two-mica quartz schist in Silurian Meiziya Formation, tectonic development settings such as ductile shear belt and tight fold, hydrothermal alteration such as pyritization and silicification, developing vein bodies such as quartz veinlet and albitite vein. There are geochemical anomalies such as Au anomaly,As anomaly, and low IP anomaly, which will be displayed by intermittent linear remote sensing image.
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