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白日其利金矿找矿标志及前景分析

         

摘要

Located in the late Caledonian Qinling‐Qilian‐Kunlun orogenic belts and the fractured‐altered zone in the magmatic arc of the eastern Kunlun Blocks ,the Bairiqili gold deposit is a typical structural altered rock‐host gold deposit .This paper focuses on the general aspects of this deposit ,including the geological setting ,gating factors of mineralization ,characteristics of the ore bodies and its geochemistry ,indicators of the deposit as well as the prediction of deep blind deposits .After comprehensive geological prospecting and evaluation on the Bairiqili gold deposit ,it can be concluded that Jinshuikou Group has been the ore‐hosting rock of the deposit ,while the fractured zone served as the migration pathway with the Variscan‐ and Indosinian intermediate‐acidic intrusion provides the thermodynamic conditions required during its mineralization .The superposition of the costal halo and the retrial halo occurs and featuring reverse zoning of these haloes after deliberating of the primary halo in the deep zone based on the Structural Superimposed Halo Model (SHM) ,which further indicate the multiple‐phase and superimposed mineralization or possible occurrence of another concentration (enrichment) of the ore bodies .%白日其利金矿产于秦祁昆晚加里东造山系、东昆中陆块之东昆中岩浆弧带中的破碎蚀变带中,属于典型的构造蚀变岩型金矿。本文详细介绍了白日其利金矿地质背景、成矿控制因素、矿化体特征、地球化学特征、找矿标志、深部预测六个方面。经综合分析,认为白日其利金矿区金水口岩群为赋矿源层,广泛发育的破碎蚀变带提供运移通道,华力西‐印支期中酸性侵入活动是形成该金矿床重要的热动力条件。最后对该区深部进行了原生晕分析,依据构造叠加晕模型,前缘晕元素与尾晕元素互相叠加,出现了反分带特征,一方面说明该区成矿具有多期叠加的特点,另一方面还说明深部还可能具有第二矿体富集带。

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