大青山煤田煤灰中Al_2O_3的赋存分布及稀土元素地球化学特征  

Coal Ash Al_2O_3 Occurrence, Distribution and REE Geochemical Characteristics in Daqingshan Coalfield

作　　者：韩亮[1] 宁树正[2] 朱华雄[3] 宋洪柱[1] 刘娟[1] 朱士飞[4] 

机构地区：[1]中国煤炭地质总局第一勘探局,河北邯郸056004 [2]中国煤炭地质总局,北京100038 [3]中国煤炭地质总局浙江煤炭地质局,浙江杭州310021 [4]江苏地质矿产设计研究院,江苏徐州221000

出　　处：《中国煤炭地质》2015年第7期7-10,共4页Coal Geology of China

基　　金：中国地质调查"华北赋煤区煤系矿产资源综合调查"(12120114012001)项目

摘　　要：通过对大青山煤田内系统采样测试、综合分析等研究方法,分析了煤田内煤灰中Al2O3赋存分布和稀土元素地球化学特征,研究表明,煤田内煤灰中Al2O3明显富集,主要赋存在铝硅酸盐矿物中;通过"质心联接"的聚类分析方法,结合沉积环境和聚煤期岩相古地理分布特征分析认为,研究区Al2O3主要受北部"阴山古陆"物源区的控制,属同沉积作用成因;统计分析研究区内稀土元素地球化学特征表明富铝煤层主要形成于陆相沉积环境,富铝矿物形成于氧化环境;通过绘制研究区内的稀土元素分配模式图,与北缘阴山古陆不同时期花岗岩(前寒武纪、加里东海西期)和不同类型花岗岩(斜长、二长、钾长、细晶)的稀土元素分配模式进行比较,发现富铝矿物主要来自北部物源区,母岩类型为加里东海西期的斜长花岗岩、二长花岗岩、钾长花岗岩、细晶花岗岩。On the basis of systematic sampling, testing and comprehensive analysis in Daqingshan coalfield, studied coal ash Al2O3 occurrence, distribution and REE geochemical characteristics. The study has shown that coal ash Al2O3 in the coal field is obviously enriched mainly in alumino-silicate minerals. Through＂barycenter linkage＂clustering analysis, combined with sedimentary environment and coal accumulation stage lithofacies-paleogeographic distribution features analysis have considered that Al2O3 in study area is mainly controlled by the provenance＂Yinshan old land＂to the north, belongs to synsedimentary genesis. Statistical analysis of study area REE geochemical characteristics has shown that aluminum-rich coal seams were mainly formed in terrestrial sedimentary environment,aluminum minerals were formed in oxidizing environment. Through study area REE distribution model drafting, compared with different aged（pre-Cambrian, Caledonian and Hercynian）, different typed（plagiogranite, adamellite, moyite, aplite granite） granite distribution models have found that aluminum-rich minerals were from the provenance to the north, mother rocks have Caledonian and Hercynian plagiogranite, adamellite, moyite and aplite granite.

关 键 词：大青山煤田 煤灰中Al2O3 物源 阴山古陆 赋存特征 稀土元素 地球化学 

分 类 号：P618.11[天文地球—矿床学]