地学前缘 ›› 2012, Vol. 19 ›› Issue (3): 130-137.

• 论文 • 上一篇    下一篇

干旱荒漠覆盖区隐伏金矿上方覆盖层三维地球化学分布模式

张必敏，迟清华，张永勤   

  1. 1. 中国地质科学院 地球物理地球化学勘查研究所， 河北 廊坊  065000 2. 中国地质科学院 应用地球化学重点开放实验室， 河北 廊坊  065000 3. 中国地质科学院 勘探技术研究所， 河北 廊坊  065000  
  • 收稿日期:2012-02-10 修回日期:2012-04-15 出版日期:2012-05-25 发布日期:2012-05-25
  • 作者简介:张必敏（1981—），男，博士，勘查地球化学专业。E-mail：zhangbimin@igge.cn
  • 基金资助:

    国土资源部行业专项“深部探测技术与实验研究”第四项目第三课题（SinoProbe-04-03）；中国地质调查局国土资源大调查项目（1212010916041）

Threedimensional geochemical distribution patterns in regolith over a concealed gold deposit in arid desert terrains.

  1. 1. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China 2. Key Laboratory for Applied Geochemistry, Chinese Academy of Geological Sciences, Langfang 065000, China 3. Institute of Exploration Technique, Chinese Academy of Geological Sciences, Langfang 065000, China
  • Received:2012-02-10 Revised:2012-04-15 Online:2012-05-25 Published:2012-05-25

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摘要：

深穿透地球化学已被证明是干旱荒漠区寻找隐伏矿的有效方法，但其对元素在覆盖层中的分布模式的探知还较少。为此，在新疆金窝子金矿运用了空气动力反循环钻探技术，以揭示元素三维分布模式，并了解元素迁移轨迹和迁移机理。形成的元素三维分布图表明：(1）元素异常在矿体上方不同深度覆盖层中具有继承性；(2）在覆盖层垂向剖面上，Au趋向于在顶层和底层富集，中间层含量较低；(3）底部异常主要分布在覆盖层和基岩接触部位的低洼位置；(4）底部异常横向延伸，范围较窄，仅数十米宽，而地表异常分布范围广，可扩展至数千米。

关键词: 三维分布模式, 覆盖区, 元素迁移, 隐伏金矿

Abstract:

In recent years, deeppenetrating geochemistry has been proven to be effective in search for concealed deposits in arid desert terrains. However, we have a little understanding of the dispersion patterns. In this study, Air Reverse Circulation (ARC) drilling technology is used to revealed the 3D distribution patterns of elements in regolith sediments over Jinwozi gold deposit, which is covered by tens of meters of regolith sediments, in order to trace the migration track and to understand the migration mechanisms. 3D distribution maps of elements generated show that (1) anomalies continuatively occur in the different depths of regolith sediments over the ore body, that (2) gold tend to be enriched in top and bottom horizon, and depleted in middle horizon in vertical direction, that (3) the anomalous distribution in bottom is restricted in the lowest places at the interface of sediments and bedrocks, and that (4) laterally the anomalous extension in the bottom is narrow within a width of tens of meters, and that in top soils is much wider and extends to several kilometers.

Key words:  threedimensional distribution patterns, coverage region, element migration, concealed gold deposits

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