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    鲁西铜石金矿田东大湾金矿成矿地质特征及找矿标志

    Geological characteristics and prospecting indicators of the Dongdawan gold deposit in the Tongshi gold field, Western Shandong

    • 摘要: 铜石金矿田为山东省鲁西地区重要的金矿集区,已查明金金属量70余吨,东大湾金矿位于铜石金矿田南部,具有良好的成矿远景,通过对金矿区内地层、岩浆岩、构造、蚀变矿化、物化探等方面的系统研究,探讨东大湾金矿成矿地质特征与找矿标志,为进一步找矿突破提供技术依据。金矿体赋存于寒武系朱砂洞组丁家庄段地层与构造破碎带内,受地层和断裂构造控制明显,控矿岩体为燕山期二长斑岩,矿石分为萤石化白云岩型金矿石和萤石化构造角砾岩型金矿石;物化探结果显示,伽马能谱放射性高钾异常和岩石地球化学金异常为该区最直接的找矿标志。

       

      Abstract: The Tongshi gold field is an important gold ore concentration area in the western Shandong Province, with identified gold resources exceeding 70 tons. The Dongdawan gold deposit located in the southern part of the Tongshi gold field, shows significant mineralization potential. This study systematically examines the strata, magmatic rocks, structures, alteration, mineralization, and geophysical and geochemical characteristics of the gold district, aiming to elucidate the metallogenic geological features and prospecting indicators of the Dongdawan gold deposit, thereby providing a technical basis for further exploration breakthroughs. The gold ore bodies are hosted in the strata of the Dingjiazhuang section of the Zhushadong Formation from the Paleozoic Cambrian and the structural fracture zones, and are significantly controlled by strata and fault structures. The ore-controlling rock is the Mesozoic Yanshanian monzonite porphyry. The ores are classified into fluoritized dolomitic limestone-type and fluoritized structural breccia-type gold ores. Geophysical and geochemical exploration indicate that the high-potassium gamma-ray spectrometry anomalies and rock geochemical gold anomaly are the most direct prospecting indicators in this area.

       

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