内蒙古胜利煤田共生锗矿的成因地球化学初探

用统计和作图的分析方法,对内蒙古胜利煤田中共生锗矿床的锗品位与挥发分、灰分、硫分的关系进行了研究。结果表明煤中锗品位与挥发分呈正相关、与原煤灰分负相关、与洗煤灰分正相关关系;全区煤属中硫煤,锗品位与原煤和洗煤硫分均呈正相关关系,煤的灰分指数较低(3 579);锗分布不均匀,富锗煤矿明显属于断裂坳陷边缘沉积,锗品位可以在煤层的顶部、中部、底部同时或单个部位呈现高值,大多数煤层中部出现锗高品位值,这有别于以往所报道的锗品位只在煤层顶、底部相对富集的研究结论。认为胜利煤田锗主要与有机质结合;锗的有利聚集条件是水动力较弱、地下水位较低、强还原的停滞沼泽环境;泥炭聚集阶段有机质的吸附作用是锗的主要富集机制。

PRELIMINARY DISCUSSION ON GENETIC GEOCHEMISTRY OF PARAGENETIC GERMANIUM DEPOSIT IN SHENGLI COALFIELD,INNER MONGOLIA

By using statistic and constructive analytical method,the relationship between germanium grade and volatile matter, ash yield and sulfur content of coals was studied. The result indicated that germanium grade is positive correlation with volatile matter,negative correlation with ash yield of raw coal, positive correlation with ash yield of cleaning coal. The coals as a whole show moderate in sulfur content.Germanium grade is positive correlation with sulfur content of raw coal and cleaning coal.Ash yield exponent of coals is 3.579,it is relatively low.The germanium distributed inhomogeneously.The rich germanium paragenetic deposit of coal belongs to the edge sediment of fault depression.High germanium grade at one time or singly exists in the top, center and bottom of coal-seams.The maximum of germanium grade are mostly appeared in the center of seam.It is different with many research conclusions reported formly that pinnacle value of germanium grade only located in the top and bottom of coal-seams.Therefore,germanium has been mainly found to be incorporated with organic matter in Shengli coalfield,favorable conglomeration condition of germanium is weaker water power,lower water table and high reductive stagnant swamp condition.The principal mechanism of germanium accumulation during the peat-forming stage is adsorption of organic matter.