煤层变质程度与锗富集的关系探讨

Discussion on the Relationship Between the Metamorphism Degree of Coal Seam and the Enrichment of Germanium

煤中锗的富集与热液活动关系密切,但热液活动导致煤层变质。为分析煤层变质程度与锗的富集关系,从云南宝山矿区采集富锗煤,测试其镜质组反射率为0.464%~1.737%,锗品位11~55μg/g,两者表现为明显负相关,表明锗的富集受到热液活动的双向控制,热液既可导致锗的富集,又可通过煤层的热液变质间接造成锗的流失。这一特点说明低温含矿热液为煤中锗的矿质来源,也是锗富集的有利条件。并通过对宝山矿区含锗煤与会泽铅锌矿伴生锗的关系分析,得出含锗煤主要分布于煤层热液变质减弱的过渡带。

The enrichment of germanium in coal is closely related to hydrothermal activity,but hydrothermal activity leads to coal bed metamorphism.In order to analyze the relationship between coal bed metamorphism and germanium enrichment,germanium rich coal was collected from the Baoshan Mining Area,Yunnan Province,and its vitrinite reflectance is 0.464%~1.737%,and the germanium grade is 11~55μg/g,which shows an obvious negative correlation,indicating that the enrichment of germanium is controlled by hydrothermal activity in both directions,and the hydrothermal fluid can not only lead to the enrichment of germanium but also cause the loss of germanium through the hydrothermal metamorphism of the coal seam,which indicates that the low-temperature ore bearing hydrothermal fluid is the source of germanium in coal and also the favorable condition for the enrichment of germanium.Through the analysis of the relationship between the germanium bearing coal in the Baoshan mining area and the associated germanium in Huize Lead-zinc mine,it is concluded that the germanium bearing coal is mainly distributed in the transition zone where the hydrothermal metamorphism of the coal seam is weakening.