鄂尔多斯盆地煤中微量元素分布特征

Coal Trace Elements Distribution Features in Ordos Basin

含煤盆地煤中共伴生的镓、锂、稀土等微量金属元素是当前煤炭地质领域重要的研究内容之一,鄂尔多斯盆地是煤中微量元素研究的热点之一。从鄂尔多斯盆地整体角度,分析了盆地煤中微量元素的时空分布特征:从平面上看,盆地煤中微量元素的富集主要集中在盆地边缘,其中以东北缘准格尔煤田、河东煤田河保偏矿区最为富集,其次为南缘渭北煤田;从含煤地层看,微量元素主要集中富集于石炭二叠纪的煤层中,主要以锂、镓的富集为主,在盆地东北缘、贺兰山煤田太原组煤中可见稀土元素的富集。侏罗系煤中微量元素主要呈分散分布,仅在盆地南缘黄陇煤田黄陵矿区发现有煤中镓富集,其余在盆地西南缘发现煤中锶、钡等金属的富集。

Coexisting and associated trace metal elements of gallium,lithium and rare earth metals etc in coal-bearing basin are important research topics in coal geological field at present,while the Ordos Basin is one of coal trace element research hotspots.From overall perspective of Ordos Basin has analyzed trace elements spatial and temporal distribution features.From the plane point of view,coal trace elements enrichment in the basin is mainly concentrated on basin margins,in which,the Jungar coalfield,Hedong coalfield and Hequ-Baode-Pianguan mining area on northeast margin are mostly enriched;the second is the Weibei coalfield on south margin.From coal-bearing strata point of view,trace elements are mainly concentrated in Permo-Carboniferous coal seams,mainly lithium,gallium enriched;rare earth elements enrichment can be seen on basin s northeast margin and in the Helanshan coalfield Taiyuan Formation coal;trace elements in Jurassic coals are mainly presented disperse distribution,only the Huanglong coalfield on basin s south margin has gallium enriched in coal;besides,on basin s southwest margin has strontium,barium etc metal elements enrichment found in coal.