黄土覆盖区金属矿床地气元素特征及示踪研究

Tracing the Source of Metals in Geogas from Metal Deposits in a Loess-covered Region

为了探讨地气成矿元素分布特征及微量元素、稀土元素示踪方法在地气物质来源研究中的应用效果,本文对黄土覆盖区蛟龙掌矿区不同介质的成矿元素、微量元素和稀土元素分布特征进行了研究。结果表明,矿体上方地气异常元素与矿石富集元素一致;背景区地气样品微量元素和稀土元素分布特征明显不同于异常区和其他固体介质,可能受到多种因素(地质体、分析环境和空白)的影响。异常区地气样品微量元素分布特征与矿石相似,受到了矿体的影响;异常区地气样品个别稀土元素分布与固体介质差异很大,可能与分析精度不够和捕集效率太低有关,只要不断改进稀土元素分析方法和捕集效率,稀土元素示踪方法可提供地气物质来源信息。

In order to test the distribution characteristics of metallogenic elements and the application effectiveness of the trace elements and REE for tracing the source of Geogas anomaly,the distribution characteristics of metallogenetic ele-ments、trace elements and REE in different media of the Jiaolongzhang Pb-Zn deposit underneath the loess have been stud-ied in this paper.Results indicate that the distribution characteristics of Geogas anomalous elements over the concealed orebodies are coincided with those of the enriched elements of ores,while the distribution characteristics of trace elements and REE in background Geogas samples are distinctly different from those of other media,indicating that the source of background Geogas materials is influenced by various factors（geological bodies,lab environment and blank reagent）.The similar distribution characteristics of the trace elements in the Geogas samples of anomalous areas and in the ores suggested that Geogas anomaly is affected by concealed orebodies in depth.The difference between REE patterns of the Geogas sam-ples of the anomalous area and those of other solid media might be caused by inadequate analytical precision and low col-lecting efficiency of the instrument.It is believed that the REE tracing method can provide the information on the source of Geogas anomaly if the analytical precision and collecting efficiency of REE could be constantly increased.