Geochemical characteristics and prospecting potential analysis based on stream sediments survey in Dakcheung,Xekong province,Laos
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摘要: 【研究目的】老挝色贡达真地区位于老挝南部成矿元素地球化学预测区，成矿潜力优越。对该区开展地球化学测量工作，缩小找矿靶区，为下一步地质找矿提供依据。【研究方法】基于1/5 万水系沉积物地球化学测量，分析了19种元素，统计了各元素分布情况及特征参数，总结了元素离散富集规律、元素组合特征及其与成矿地质条件的关系，初步探讨了元素在不同地层（地质体）的分布情况。【研究结果】研究认为：Au、Sn 和Pb 元素为研究区主成矿元素，Au 元素在绢云母片岩和黑云母花岗岩中富集和离散程度高，Sn 元素在绢云母片岩中富集和离散程度较高，Pb元素在黑云母花岗岩中富集和离散程度较高。【结论】结合成矿地质条件、地球化学特征，共圈定10处地球化学综合异常，在综合研究的基础上划分出了3 处找矿远景区。通过开展异常查证工作，最终优选出HS8 综合异常，圈定达珑（DaLong）成矿远景区具较大成矿潜力，为下一步地质找矿工作提供依据。Abstract: This paper is the result of geochemistry research.[Objective] The Sekong Dakcheun area in Laos is located in the geochemical prediction zone of mineralizing elements in southern Laos, with superior mineralization potential.Geochemical exploration are carried out in this area to narrow down the target area for mineralization and provide a basis for the next geological prospecting.[Methods]Based on the geochemical exploration of 1/50 000 stream sediments, 19 elements were analyzed, the distribution of each element and its characteristic parameters were statistically analyzed, the discrete and enrichment patterns of the elements, the characteristics of the element combinations and their relationship with the geological conditions of mineralization were summarized, and the distribution of the elements in the different stratigraphic layers(geologic bodies)was preliminarily investigated.[Results]The study concludes that Au, Sn and Pb are the main metallogenic elements in the study area, element Au is highly enriched and discrete in sericite schist and biotite granite, Sn is more enriched and discrete in sericite schist, and Pb is more enriched and discrete in biotite granite.[Conclusions] Combined with the geological conditions and geochemical characteristics of mineralization, 10 geochemical anomalies have been identified, and 3 prospecting areas have been divided on the basis of the comprehensive study.The anomaly verification work was carried out, and the HS8 comprehensive anomalies were finally selected to define the DaLong mineralization prospective area as having a large mineralization potential, which will provide a basis for the next stage of the geological prospecting work.
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Key words:
- prospecting target area /
- geochemical characteristics /
- stream sediment /
- Dakcheung Laos
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