内蒙古自治区胜利煤田煤-锗矿床元素地球化学性质研究  

Research on elemental geochemical characteristics of coal-Ge deposit in Shengli coalfield,Inner Mongolia,China

作　　者：黄文辉[1] 万欢[1] 杜刚 孙磊[1] 马延英[1] 唐修义[3] 武文 秦胜利 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]内蒙古煤炭地质调查院,内蒙古呼和浩特010051 [3]安徽理工大学,安徽淮南232001

出　　处：《地学前缘》2008年第4期56-64,共9页Earth Science Frontiers

基　　金：国家重点基础研究发展计划“973”项目(2006CB202202);国家自然科学基金资助项目(40572090,40772095)

摘　　要：内蒙古自治区胜利煤田煤-锗矿是新近发现的特大型锗矿床,矿区元素地球化学性质表现为:碱性元素Ca、K、Na、Mg、Al等相对富集,锗与其关系为正相关;轻重稀土元素分异度较大,轻稀土元素较为富集,随锗含量的递增,轻稀土元素由富集逐渐减弱,重稀土元素逐渐出现较弱富集;锗含量与REE、LREE负相关,与LREE/REE、δEu正相关,与La/Yb、La/Sm、(La/Yb)n、(La/Sm)n、δCe值均呈负相关关系;而锗含量与灰分指数呈负相关关系。成煤沼泽中比较平静停滞的水文条件有利于溶液中的锗被有机质充分吸附。胜利煤田煤-锗矿形成环境为弱碱性及还原性较强的环境。煤-锗矿床的稀土元素地球化学特征具有继承性,稀土主要来自物源区的无机物质,胜利煤田西南部盆缘的岩石富含锗,可能就是煤-锗矿床中锗的原始来源。锗源母岩区全锗的供给和全锗进入成煤沼泽后的水文地质条件对锗在泥炭中的富集具有控制作用。The newly found coal germanium deposit in Shengli coalfield in Inner Mongolia is a super-scale germanium deposit. It is the largest coal-germanium in the world with 1805 ton proven resource of germaniurru In this deposit, the elemental geochemical characteristics show that the alkaline elements, such as Ca, K, Na, Mg, AI, and so on are enriched, and positively correlated to germanium; that with increasing germanium content, LREE enrichment is gradually weakened and HREE is gradually enriched; that the germanium content is negatively correlated to ∑REE and LREE, while positively to LREE/HREE and δEu, and negatively to La/ Yb, La/Sm, （La/Yb）n, （La/Sm）n and 3Ce; that the content of germanium is negatively correlated to ash index of coal. The coal-forming swamp with sluggish water favored the sufficient absorption of germanium from solution by organic rr^atters. The coal-germanium deposit of Shengli coalfield is formed in the weaker alkaline and stronger reductive environment. REE geochemical characteristics in coal-germanium deposit have inheritance, and REE mainly comes from inorganic materials in the source area. And, the rocks from the southwest margin of the basin are rich in germanium, and probably become the original source of germanium of this coalgermanium deposit. The supply of germanium from the source area and the hydrologic geology conditions for germanium coming into coal forming swamps are the controlling factors for germanium enrichment.

关 键 词：锗 灰分指数 稀土元素 地球化学 胜利煤田 

分 类 号：P618.75[天文地球—矿床学] P618.11[天文地球—地质学]