Geochemical Background Values of 69 Elements in Surface Sediment of the Laos
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摘要: 老挝地质条件优越，资源潜力巨大. 为响应国家“一带一路”倡议，在老挝全境开展1∶100万国家尺度地球化学填图工作. 采集了大量地球化学数据，为研究区元素分散富集、矿产开发、环境保护、农业生产提供了高质量的基础地球化学数据.共采集地球化学样品2 079件，采用高精度分析技术及严格的质量控制，分析了69种元素. 采用X±3S一次性剔除异点后数据集的中位值作为估值，首次给出了老挝全国69种元素地球化学背景值，填补了老挝国家尺度地球化学填图工作的空白. 初步讨论了老挝全境、7个三级大地构造单元，6个三级成矿带69种元素的背景值特征. 研究表明不同构造单元中受地质背景、构造及岩浆活动的影响，元素分布具有各自特征，同时不同成矿带受成矿作用及构造岩浆活动的影响，元素在各个成矿带分布特征不同，元素的富集对矿床有很好的指示意义. 这些背景值的获得为下一步深入研究老挝地球化学填图数据提供了基础对比数据.Abstract: Laos has excellent ore⁃forming geological conditions and great resource potentials. The 1: 1 000 000 National⁃scale Geochemical Mapping project was conducted in the whole area of Laosat the advocate of the "Belt and Road" Initiative.A large amount of geochemical data was collected, which provided high⁃quality basic geochemical data for the study on elemental dispersion and enrichment, mineral exploration, environmental protection and agricultural production.A total of 2079 geochemical samples were collected, 69 elements were analyzed by high⁃precision analytical techniques under the strict quality control. The data set was once processed by the X±3S and the anisotropy was dropped, the median value of the processed data set was used as the valuation. As a result, the first batch of geochemical background values of 69 elements of the Laos was acquired, which filled the gap of national⁃scale geochemical mapping work in Laos. The characteristics of 69⁃element background values of Laos, 7 tertiary geotectonic units and 6 tertiary metallogenic belts throughout Laos are primarily discussed. The study shows that the distribution of elements in different tectonic units is characterized by geological background, tectonic and magmatic activities, while the distribution of elements in different mineralization zones are different due to the influence of mineralization and tectonic magmatic activities, and the enrichment of elements is a good indicator of mineral deposits. The acquisition of these background values provides basic comparative data for the next in⁃depth study of geochemical mapping data in Laos.
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图 2 景洪-素可泰火山弧区域浓集系数对比图
Fig. 2. Comparison map of regional concentration coefficient values in Jinghong⁃Sukhothai arc
图 3 思茅-彭世洛区域浓集系数对比图
Fig. 3. Comparison map of regional concentration coefficient values in Simao⁃Phitsanulok block
图 4 奠边府-黎府缝合带区域浓集系数对比图
Fig. 4. Comparison map of regional concentration coefficient values in DienBienPhu⁃Loei suture
图 5 万象-昆嵩地块区域浓集系数对比图
Fig. 5. Comparison map of regional concentration coefficient values in Vientiane⁃Kontum block
图 6 色潘-三岐缝合带区域浓集系数对比图
Fig. 6. Comparison map of regional concentration coefficient values in Sepon⁃TamKy suture
图 7 长山地块区域浓集系数对比图
Fig. 7. Comparison map of regional concentration coefficient values in Truong Son block
图 8 哀牢山-马江缝合带区域浓集系数对比图
Fig. 8. Comparison map of regional concentration coefficient values in Ailaoshan⁃Song Ma sture
图 9 清迈成矿带区域浓集系数对比图
Fig. 9. Comparison map of regional concentration coefficient values in Chiang Mai Metallogenic Belt
图 10 琅南塔-庄他武里成矿带区域浓集系数对比图
Fig. 10. Comparison map of regional concentration coefficient values in Luangnamtha⁃Chanthaburi Metallogenic Belt
图 11 琅勃拉邦-大叻成矿带区域浓集系数对比图
Fig. 11. Comparison map of regional concentration coefficient values in Louangphrabang⁃Đà Lat Metallogenic Belt
图 12 万象-昆嵩成矿带区域浓集系数对比图
Fig. 12. Comparison map of regional concentration coefficient values in Vientiane⁃Kontum Metallogenic Belt
图 13 长山成矿带区域浓集系数对比图
Fig. 13. Comparison map of regional concentration coefficient values in Truong Son Metallogenic Belt
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