摘要
根据大量勘探期钻孔地质资料,分析了大同煤田北部石炭二叠纪煤中锗(Ge)、镓(Ga)、铀(U)等元素的分布赋存特征。结果显示研究区煤中Ge,Ga,U平均含量分别为2.01,18.3,31.4μg/g,与国内其他矿区煤中对应元素含量平均值相比,Ge相对分散、Ga较富集、U特别富集,并且山西组煤中Ga,Ge含量大于太原组煤。研究区煤中Ge,Ga,U总体上表现为矿物亲和性,其中Ga主要存在于黏土矿物中、受陆源碎屑控制;Ge主要存在于硅酸盐矿物中;U多赋存在含Ca,F的矿物中,但分布很不均匀,通常在同一钻孔的不同煤层中富集,可能与垂向裂隙中的富U流体有关,并且山西组4号煤层(山4)中U的富集可能与黏土矿物的吸附有关,而频繁的海水淋漓作用可能是太原组8号煤层中U特别富集的原因之一。
Based on the large number of drilling geological information during the exploration period, the paper analyzed the distribution deposit features of Ge, Ga, U and other elements in the Permo-Carboniferous Period seam of the northern part of Datong Coalfield. The results showed that the average contents of the Ge, Ga and U in seam of the research area would be 2. 01, 18.3 and 31.4 ~g/g indivi- dually. In comparison with the average value of the corresponding element content in the coal of the domestic mining areas, Ge was rela- tively separated, Ga was relatively enriched and U was specially enriched. Ga and Ge contents in seams of Shanxi Group were higher than the seam of Taiyuan Group. Ge, Ga and U in the seams of the research area presented the amicability of the mineral in generally and the Ga was mainly in the clay mineral and was controlled by the terrigenous fragments. Ge was mainly in the silicate mineral. U mostly was in the mineral with Ca and F contents and the distribution of U was inhomogeneous. Generally U would be enriched in deferent seams in a same drilling borehole and would be related to the rich U liquid in the vertical fissures. U enriched in the No. 4 seam of Taiyuan Group might be related to the adsorption of the clay mineral. Frequently washing function by seam water might be one of the causes for U special enriched in No. 8 seam of Taiyuan Group. ：
出处
《煤炭科学技术》
CAS
北大核心
2010年第2期117-121,85,共6页
Coal Science and Technology
基金
国家自然科学基金资助项目(40772102)
新世纪优秀人才支持计划资助项目(NCET-08-0839)
关键词
Ge
Ga
U
分布
赋存
石炭二叠纪煤
大同煤田
Ge
Ga
U
distribution
deposit
Permo-Carboniferous Period coal
Datong Coalfield
