新疆伊犁盆地洪海沟地区煤岩型铀成矿分析
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摘要
伊犁盆地洪海沟地区煤岩型铀矿主要赋存在中侏罗统西山窑组上段12#号煤层。具有品位高、厚度薄、矿体连续稳定等特征。研究区内煤岩型铀矿成规模的发育,与其上覆头屯河组砂体具有一定的相关性。通过对煤岩样品进行煤质分析和显微定量统计,确定了研究区12#煤层铀富集因素、古气候和水动力环境。结合研究区头屯河组沉积相特征,地下水化学类型等因素,对研究区煤岩型铀成矿进行分析。结果表明,在河流泛滥盆地内由泥炭沼泽形成的煤层,直接与上覆砂岩接触,有利于煤岩型铀矿化的形成;煤岩型工业铀矿化与惰质组具有较高的正相关关系;地下水北西向流动,形成了特有的向河心泥滩向北西方向延伸的舌状煤岩型铀矿带。
The coal-type uranium deposit in the Honghaigou area, Ili Basin is mainly hosted in middle Jurassic Xishanyao Formation upper member coal No.12. It has characteristics of high grade, thin thickness and steady continuous orebody. Coal-type uranium deposit in study area presents large scaled development, and has certain interdependency with overlying Toutunhe Formation sand body.Through coal quality analysis and microscopic quantitative statistics for coal and rock samples, have determined coal No.12 uranium enrichment factors, paleoclimatic and hydrodynamic environments in study area. Combined with the factors of Toutunhe Formation sedimentary facies features, groundwater hydrochemical types, carried out coal-type uranium metallogenic analysis. The result has shown that fluvial flood basin coal seams formed in peat bogs, directly contacted with overlying sandstone, thus in favor of coal-type uranium metallogenic. Higher positive correlation has existed between coal-type industrial uranium metallogenic and inertinite. Paleochannel had flowed northwestward, formed specific mud flats toward the middle of paleochannel and northwestern extending linguoid coal-type uranium deposit belt.
The coal-type uranium deposit in the Honghaigou area, Ili Basin is mainly hosted in middle Jurassic Xishanyao Formation upper member coal No.12. It has characteristics of high grade, thin thickness and steady continuous orebody. Coal-type uranium deposit in study area presents large scaled development, and has certain interdependency with overlying Toutunhe Formation sand body.Through coal quality analysis and microscopic quantitative statistics for coal and rock samples, have determined coal No.12 uranium enrichment factors, paleoclimatic and hydrodynamic environments in study area. Combined with the factors of Toutunhe Formation sedimentary facies features, groundwater hydrochemical types, carried out coal-type uranium metallogenic analysis. The result has shown that fluvial flood basin coal seams formed in peat bogs, directly contacted with overlying sandstone, thus in favor of coal-type uranium metallogenic. Higher positive correlation has existed between coal-type industrial uranium metallogenic and inertinite. Paleochannel had flowed northwestward, formed specific mud flats toward the middle of paleochannel and northwestern extending linguoid coal-type uranium deposit belt.
引文
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[5]许福美,方爱民.山东兖州矿区太原组16号煤层煤相研究[J].煤田地质与勘探,2005,33(4):10-13.
[6]王德祖.华亭矿区5号煤层煤相研究[J].中国煤炭地质(原中国煤田地质),2005,(4):6-8.
[7]庄新国,向才富,曾荣树,等.三种不同类型盆地煤中微量元素对比研究[J].岩石矿物学杂志,1999(3):255-263.
[8]邢军,刘光祥,许光泉.先锋盆地小龙潭组巨厚煤层煤相特征[J].煤田地质与勘探,1999,27(4):1-4.
[9]庄新国,王生维.抚顺、梅河口盆地分析中煤岩煤质参数的应用[J].煤田地质与勘探,1993,21(6):1-6.
[10]王生维,庄新国.抚顺煤的有机地球化学特征及煤相浅析[J].地球科学,1990(1):57-64.
[11]朱雪芬.研究煤相的几种方法(一)[J].煤田地质与勘探,1985,05.
[12]HARVEY R D,DILLON J W.Maceral distributions in Illinois coals and their paleoenvironmental implications[J].International Journal of Coal Geology,1985,5(1/2):141-165.
[13]罗星刚,李家金,康勇,等.新疆察布查尔县洪海沟地区铀矿普查[R].新疆乌鲁木齐:核工业二一六大队,2012.