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1、第27卷第1期世界核地質(zhì)科學(xué)Vo1.27.No.12010年3月WorldNuclearGeoscienceMar.2010DOI:10.39690.issn.1672-0636.2010.01.003巴音戈壁盆地含礦目的層沉積相特征與砂巖型鈾礦化的關(guān)系何中波,羅毅,馬漢峰(核工業(yè)北京地質(zhì)研究院,北京100029)[摘要]重點(diǎn)論述了盆地3處鈾礦床(點(diǎn))含礦層早白堊世巴音戈壁組上段沉積相展布特征及其與鈾礦化的關(guān)系。認(rèn)為該地區(qū)鈾礦化發(fā)育主要受兩種沉積環(huán)境控制:(1)受扇前辮狀分流河道控制,該沉積環(huán)境內(nèi)發(fā)育厚層砂體,具有泥一砂一泥結(jié)構(gòu),在潮濕、濕熱古氣候環(huán)境下,該沉積環(huán)境內(nèi)的砂體中富含有機(jī)質(zhì)
2、和炭屑,有利于鈾成礦;(2)受各類(lèi)沼澤沉積環(huán)境控制,在潮濕、濕熱古氣候環(huán)境下,該地區(qū)發(fā)育大面積沼澤,沼澤沉積環(huán)境中多為泥炭、泥質(zhì)巖及碳質(zhì)巖沉積,有利于鈾元素的吸附、沉淀、富集并成礦。受控于兩種沉積環(huán)境,該盆地內(nèi)砂巖型鈾礦化礦體存在兩種表現(xiàn)形式:卷狀及板狀。其成因?yàn)閷娱g氧化作用與同生沉積富集共存。[關(guān)鍵詞]巴音戈壁盆地;砂巖型鈾礦;辮狀河;沉積相[中圖分類(lèi)號(hào)]P619.14;P598[文獻(xiàn)標(biāo)志碼]A[文章編號(hào)]1672—0636(2010)01—0011—08Sedimentaryfaciescharacteristicsofore—bearingtargethorizonanditsr
3、elationshiptosandstone—typeuraniummineralizationinBayingebiBasinHEZhong—bo,LUOYi,MAHan—feng(BeijingResearchInstituteofUraniumGeology,Beijing100029,China)Abstract:SedimentaryfaciesdistributioncharacteristicsoftheuppermemberofEarlyCretaceousBayingebiFormationanditsrelationshipwithuraniummineraliza
4、tionarestudiedwithfocusinthreedeposits(oreoccurrences)inBayingebiBasin.Itisconsideredthatthedevelopmentofuraniummineralizationofthebasinismainlycontrolledbytwosedimentaryenvironments:(1)braideddistributarychannelonfan-deltafrontwhichdevelopedinhumidandhotpalaeo‘—climaticenvironmentandproducedcla
5、y——sand_‘mudstratawiththicklayeredsandbodiesrichinorganicmatterandcarboniferousdebriswhicharebeneficialtosandstone—typeuraniummineralization;(2)differenttypesofmarshoflargeareawhichenvolvedinhumidandhotpalaeo—climateandbearalargeamountofpeat,argilliteandcarbonaceousrockwhicharebeneficialforurani
6、umadsorption,precipitationandenrichment.Controlledbytwokindsofsedimentaryenvironments,uraniumorebodiesinthisbasinareofroll—typeandtabular—type,andtheminearalizationisthecoexistenceofinter—layeredoxidationandsyngeneticsedimentaryenrichment.Keywords:BayingebiBasin;sandstone—typeuraniumdeposit;brai
7、dedriver;sedimentaryfacies[基金項(xiàng)目]中國(guó)核工業(yè)地質(zhì)局鈾礦地質(zhì)項(xiàng)目——內(nèi)蒙古巴音戈壁盆地砂巖型鈾礦成礦條件分析(編號(hào):200742)資助。[收稿日期]2009—10—19;[修回日期]2009—12—10[作者簡(jiǎn)介]何中波(198O~),男,湖北襄樊人,工程師,主要從事沉積學(xué)、盆地分析等方面的研究。E—mail:hzb100029@163.corn第1期何中波,等:巴音戈壁盆地含礦目的層沉積相特征與砂巖型鈾礦化的關(guān)系1