| 于 桑.干旱草原覆盖区非矿致化探异常的识别与解释—以内蒙古洪根尼乎都格草原D2选区为例[J].地质与勘探,2014,50(6):1118-1125 |
| 干旱草原覆盖区非矿致化探异常的识别与解释—以内蒙古洪根尼乎都格草原D2选区为例 |
| Identification and interpretation of non-ore-causative geochemical anomalies in arid grasslands: An example of the D2 area in the Hongennihuduge steppe，Inner Mongolia |
| 投稿时间：2014-01-07 修订日期：2014-08-15 |
| DOI： |
| 中文关键词: 干旱草原覆盖区 非矿致异常 异常解释 覆盖物物源 Cu、Mo相态分析 |
| 英文关键词: Arid grassland-covered region, non-ore-causative geochemical anomalies, geochemical anomaly interpretation, sources of the cover, phase analysis of Cu and Mo |
| 基金项目:中国地质调查局工作项目(编号：12120113088900)资助 |
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| 中文摘要: |
| 受自然因素的影响，干旱草原覆盖区化探异常往往存在多解性和不确定性，如何对非矿致化探异常进行有效识别和解释对降低勘探风险具有极为重要的现实意义。内蒙古洪根尼乎都格干旱草原景观覆盖区(D2选区)为乌日尼图式找矿预测重点验证区。通过1:2.5万的常规化探工作，在该区内发现了明显的Cu、Mo、W异常。结合已有的化探资料，以及典型土壤样品主微量元素测试，矿物成分分析，Cu、Mo相态分析的结果，对该覆盖区覆盖物的物源进行了初步判断并研究了重点成矿元素Cu、Mo的异常成因：发现Cu、Mo异常区与背景区内覆盖物来源有明显差异，判断该区Cu、Mo异常为非矿致异常。同时在此研究基础上提出了在覆盖区化探工作中识别与解释非矿致异常的思路和方法。 |
| 英文摘要: |
| Because of the natural factors, multiple solutions and uncertainty exist in explanations of geochemical anomalies from areas covered by arid steppe. To reduce the risk of ore exploration, it is necessary to study the recognition and interpretation of non-ore-causative geochemical anomalies. The arid grassland-covered region (D2 area) in the Honggennihuduge steppe，Inner Mongolia is a key verification zone of the Wurinitu-style deposit. Obvious geochemical anomalies of Cu，Mo，and W are found through the geochemical exploration on a scale 1: 25000. Based on the existing geochemical data, we have made preliminary judgments about sources of the cover materials. Furthermore, we have studied the causes for geochemical anomalies of the metallogenetic elements Cu and Mo through analyses of major and trace elements, mineral composition, and phase of Cu-Mo. The results reveal a marked difference of sources between the geochemical anomaly area and background area. And we suggest that these anomalies are not caused by minerals. Based on this case study, we propose a line of thought and method to identify and interpret non-ore-causative geochemical anomalies in covered regions. |
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