保德杨家湾勘查区煤中镓的赋存及富集成因
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摘要
分析了保德杨家湾勘查区太原组、山西组煤中镓的赋存形式和富集成因。根据煤炭勘查钻孔Y501的资料,该孔煤样中镓含量5～35μg/g,平均20μg/g。煤灰成分聚类及相关分析显示,煤中镓含量与灰分、灰成分氧化铝正相关,与灰成分氧化钙、氧化硫、氧化铁负相关,表明煤中镓的主要载体是粘土矿物和铝的氢氧化物,黄铁矿、磷灰石等原生矿物中贫镓,镓的主要来源是北部阴山的中酸性火成岩。通过镓含量与沉积环境参数的垂向对比,发现还原性较弱、水体动荡的沼泽环境利于煤中镓富集。
The paper discusses the occurrence and enrichment causes of gallium in coals from Shanxi Formation and Taiyuan Formation in Yangjiawan exploration area in Baode.Based on the geological data from drilling Y501in coal exploration,it obtains that gallium in Y501coal varies between 5and 35μg/g,and the average content is 20μg/g.The results of ash components clustering and relative analysis show that the gallium content is positively correlated to the coal ash, Al2O3 and negatively correlated to the ash components of CaO,SO3,Fe2O3,which indicate that the gallium in Y501coal occurs mainly in clay minerals and aluminum hydroxides rather than pyrite,apatite and other primary minerals,and the gallium is mainly derived from the intermediate- acid igneous rocks of Yinshan mountain.The vertical comparison between the content of gallium and sedimentary environment parameters implies that the peat bog with weaker reducibility and stronger water dynamic might be conductive to the accumulation of gallium.
The paper discusses the occurrence and enrichment causes of gallium in coals from Shanxi Formation and Taiyuan Formation in Yangjiawan exploration area in Baode.Based on the geological data from drilling Y501in coal exploration,it obtains that gallium in Y501coal varies between 5and 35μg/g,and the average content is 20μg/g.The results of ash components clustering and relative analysis show that the gallium content is positively correlated to the coal ash, Al2O3 and negatively correlated to the ash components of CaO,SO3,Fe2O3,which indicate that the gallium in Y501coal occurs mainly in clay minerals and aluminum hydroxides rather than pyrite,apatite and other primary minerals,and the gallium is mainly derived from the intermediate- acid igneous rocks of Yinshan mountain.The vertical comparison between the content of gallium and sedimentary environment parameters implies that the peat bog with weaker reducibility and stronger water dynamic might be conductive to the accumulation of gallium.
引文
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[3]秦勇,王文峰,程爱国.首批国家规划矿区煤中镓的成矿前景[J].中国煤田地质,2009(1)
[4]王钧漪,王文峰,李健等.元素锗镓铀在大同煤田北部煤中的赋存特征[J].煤炭科学技术,2010(2)
[5]刘新花,秦勇,王文峰.古交邢家社勘查区煤中镓的分布及其地质影响因素[J].煤田地质与勘探,2009(2)
[6]解锡超,张正喜,唐跃刚.山西省太原组和山西组煤的煤岩特征分析[J].中国煤田地质,2011(8)
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