云南干河特高有机硫煤中铼的地球化学特征及富集成因探讨

利用高分辨率电感耦合等离子质谱(ICP-MS)结合微量元素地球化学指标参数和带能谱的场发射扫描电镜(SEM-EDS)对云南干河上二叠统吴家坪组3,4号特高有机硫煤(Sod=9.03%)中铼元素(Re)的地球化学特征和富集成因进行了探讨,结果表明:Re在干河煤中高度富集,平均含量为229.14 ng/g,与世界硬煤中1 ng/g的平均含量相比,其富集系数达229.14。Re含量与灰分产率及常量元素含量的相关分析表明,3号煤层Re主要赋存于有机质中,而4号煤层除赋存在有机质中外,还存在于黏土矿物中。Sr/Ba,U/Th,Ni/Co和Vi/Ni+V地球化学指标参数表明,3,4号煤形成于受海水影响的强还原环境泥炭沼泽。干河煤中Re的富集可能更多的来自于后生阶段的热液流体,随海水入侵至煤层后被有机质还原,迁移能力减弱从而主要被有机质吸附、络合。3号煤中Re异常高富集煤分层(GH12-3,1 150 ng/g)同时也富集Co,Ni,Cu,Zn和Cd,这可能与该煤层的成煤环境和海洋微生物相关。

Geochemistry and enrichment origin of the Rhenium in a super high organic sulfur coal from Ganhe coalmine,Yanshan Coalfield,Yunnan,China

Rhenium (Re) in a super high organic sulfur (SHOS) coal from Ganhe coalmine,Yanshan Coalfield,Yunnan,China,is investigated by high resolution inductively coupled plasma mass spectrometry (ICP-MS) and scanning electron microscope equipped with energy dispersive spectrometer (SEM-EDS).Combined with geo chemical parameters of trace elements,the geochemistry and enrichment origin of Re in Ganhe coal are discussed.Compared with the Re average abundance of worldwide hard coals (1 ng/g),the Ganhe coal is remarkably rich in Re (229.14 ng/g).From the correlation analysis of Re concentrations and ash yields,as well as major elements contents,Re is mainly associated with organic matters,and in No.4 coal is partly associated with clay.Indicated by Sr/Ba,U/Th,Ni/Co,and Vi/Ni+V,Ganhe coal was deposited under an anoxic reducing condition strong influenced by marine.When the Ganhe coal was invaded by possible submarine exhalation,Re was reduced by organic matter,and then the mobility of Re was decreased,and finally Re was absorbed or complicated by organic matter.The concentrations of Re,together with Co,Ni,Cu,Zn,and Cd in GH12 3 are the highest in Ganhe coal,which may be related with marine microorganism.