鄂尔多斯盆地东北部塔然高勒地区还原介质对砂岩型铀矿的控制
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摘要
为明确鄂尔多斯盆地塔然高勒地区直罗组、延安组地层中煤、黄铁矿等还原介质与砂岩型铀矿的共存关系,选取直罗组含矿砂体及其中的黄铁矿、炭屑以及延安组煤层等为研究对象,综合利用钻孔编录、显微镜和电子探针分析等手段开展研究。结果表明,研究区铀矿体与延安组煤层、直罗组炭屑具有空间和成因上的关联,延安组煤层为铀的沉淀提供了大量的还原剂,而直罗组炭屑里的腐植酸对铀酰离子起到吸附和络合的作用;铀石是该区最主要的铀矿物类型,其与莓球状黄铁矿、蚀变黄铁矿、胶状黄铁矿、钛铁矿、白钛石伴生关系明显;有机质、黄铁矿等还原介质的含量及空间分布可以作为铀成矿的指示标志。
In order to clarify the coexisting relationship between the coal, pyrite and other reducing medium in Yan'an and Zhiluo Formation and the sandstone uranium deposit in Tarangaole area, the ore-bearing sand body, pyrite and carbon debris in Zhiluo Formation and coal seam in Yan'an Formation were selected as the research object, a series of test including drilling core catalog, microscope analysis and electron probe analysis were used to carry out research. It has been shown that the uranium ore body, coal seam in Yan'an Formation, carbon debris in Zhiluo Formation are vertically stacked and related in genesis, the coal deposits of Yan'an Formation provide a large amount of reducing agent for uranium deposits, while the humic acid in the charcoal of Zhiluo Formation mainly played the role of adsorption and complexation; Coffinite is the main uranium ore type and has connection with framboidal pyrite, altered massive pyrite, colloidal pyrite, ilmenite, leucoxene; The amount of reducing medium and spatial distribution can be used as indicator of uranium mineralization.
In order to clarify the coexisting relationship between the coal, pyrite and other reducing medium in Yan'an and Zhiluo Formation and the sandstone uranium deposit in Tarangaole area, the ore-bearing sand body, pyrite and carbon debris in Zhiluo Formation and coal seam in Yan'an Formation were selected as the research object, a series of test including drilling core catalog, microscope analysis and electron probe analysis were used to carry out research. It has been shown that the uranium ore body, coal seam in Yan'an Formation, carbon debris in Zhiluo Formation are vertically stacked and related in genesis, the coal deposits of Yan'an Formation provide a large amount of reducing agent for uranium deposits, while the humic acid in the charcoal of Zhiluo Formation mainly played the role of adsorption and complexation; Coffinite is the main uranium ore type and has connection with framboidal pyrite, altered massive pyrite, colloidal pyrite, ilmenite, leucoxene; The amount of reducing medium and spatial distribution can be used as indicator of uranium mineralization.
引文
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[20]焦养泉,吴立群,彭云彪,等.中国北方古亚洲构造域中沉积型铀矿形成发育的沉积-构造背景综合分析[J].地学前缘,2015,22(1):189-205.JIAO Yangquan,WU Liqun,PENG Yunbiao,et al.Sedimentarytectonic setting of the deposition-type uranium deposits forming in the Paleo-Asian tectonic domain,North China[J].Earth Science Frontiers,2015,22(1):189-205.
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[26]刘大锰,杨起,周春光,等.华北晚古生代煤中黄铁矿赋存特征与地质成因研究[J].地球化学,1999,28(4):340-350.LIU Dameng,YANG Qi,ZHOU Chunguang,et al.Occurrence and geological genesis of pyrites in Late Paleozoic coals in North China[J].Geochimica,1999,28(4):340-350.
[27]巫声扬,王德生,马占文.四川某地沉积铀矿床中的白硒铁矿[J].岩矿测试,1982,1(4):25-29.WU Shengyang,WANG Desheng,MA Zhanwen.Discovery of ferroselite in sedimentary uranium deposit,Sichuan[J].Acta Petrologica Mineralogica ET Analytica,1982,1(4):25-29.
[2]戴明建,李文辉,刘璐,等.鄂尔多斯盆地纳岭沟铀矿床后生蚀变成因及其与铀成矿的关系[J].地质通报,2017,36(4):520-526.DAI Mingjian,LI Wenhui,LIU Lu,et al.The genesis of epigenetic alteration and its relationship with uranium mineralization in the Nalinggou uranium deposit,Ordos basin[J].Geological Bulletin of China,2017,36(4):520-526.
[3]焦养泉,陈安平,杨琴,等.砂体非均质性是铀成矿的关键因素之一:鄂尔多斯盆地东北部铀成矿规律探讨[J].铀矿地质,2005,21(1):8-15.JIAO Yangquan,CHEN Anping,YANG Qin,et al.Sand body heterogeneity:One of the key factors of uranium metallogenesis in Ordos basin[J].Uranium Geology,2005,21(1):8-15.
[4]谢慧丽,吴立群,焦养泉,等.鄂尔多斯盆地罕台庙地区铀储层非均质性定量评价指标体系研究[J].地球科学,2016,41(2):1-14.XIE Huili,WU Liqun,JIAO Yangquan,et al.The quantitative evaluation index system for uranium reservoir heterogeneity in Hantaimiao Region,Ordos basin[J].Earth Science,2016,41(2):1-14.
[5]韩效忠,张字龙,姚春玲,等.鄂尔多斯盆地东北部构造特征及其对铀矿化的控制作用[J].铀矿地质,2009,25(5):277-282.HAN Xiaozhong,ZHANG Zilong,YAO Chunling,et al.Structual characteristic and its control to uranium mineralization in the northeast of Ordos basin[J].Uranium Geology,2009,25(5):277-282.
[6]朱强,李建国,俞礽安,等.鄂尔多斯盆地塔然高勒地区直罗组上、下段的岩性-岩相特征及对铀成矿的差异性控制作用[J].地球学报,2018.http://kns.cnki.net/kcms/detail/11.3474.P.20180905.1418.002.html.ZHU Qiang,LI Jianguo,YU Reng’an,et al.Lithologiclithographic characteristics of the upper and lower members of the Zhiluo formation and their differential control of uranium mineralization in the Tarangaole area,Ordos basin[J].Acta Geoscientica Sinica,2018.http://kns.cnki.net/kcms/detail/11.3474.P.20180905.1418.002.html.
[7]汤超,朱强,冯晓曦,等.内蒙古东胜大型砂岩型铀矿床稀土元素地球化学研究[J].矿物学报,2017,37(1/2):121-131.TANG Chao,ZHU Qiang,FENG Xiaoxi,et al.REE geochemical study on Dongsheng sandstone uranium deposit,Inner Mongolia,China[J].Acta Mineralogica Sinica,2017,37(1/2):121-131.
[8]易超,王贵,李西得,等.鄂尔多斯盆地东北部直罗组铀富集特征及铀成矿模式探讨[J].矿床地质,2018,37(4):835-852.YI Chao,WANG Gui,LI Xide,et al.A tentative discussion on uranium enrichment characteristics and metallogenic model in Zhiluo Formation,northeastern Ordos basin[J].Mineral Deposits,2018,37(4):835-852.
[9]刘正义,李西得,赵兴齐,等.鄂尔多斯盆地皂火壕-纳岭沟地区铀矿含矿砂体矿物特征与成矿机理探讨[J].西北地质,2017,50(2):191-206.LIU Zhengyi,LI Xide,ZHAO Xingqi,et al.Discussion on metallogenic mechanism and mineral characteristics of orebearing sandstone from the Zaohuohao-Nalinggou Deposit in Ordos basin[J].Northwestern Geology,2017,50(2):191-206.
[10]刘正邦,焦养泉,薛春纪,等.内蒙古东胜地区侏罗系砂岩铀矿体与煤层某些关联性[J].地学前缘,2013,20(1):147-153.LIU Zhengbang,JIAO Yangquan,XUE Chunji,et al.The correlation between sandstone uranium ore-body and the coal bed in Jurassic system,Dongsheng,Inner Mongolia[J].Earth Science Frontiers,2013,20(1):147-153.
[11]杨斌虎,罗静兰,戴亚权,等.含铀砂岩中铀与有机质、油气和煤的关系:以鄂尔多斯盆地东胜地区和吐哈盆地十红滩地区为例[J].西北大学学报(自然科学版),2006,36(6):982-991.YANG Binhu,LUO Jinglan,DAI Yaquan,et al.Petrology of uranium-bearing sandstones and relationship of organic matters,hydrocarbons and coal with uranium:An example from Dongsheng,Ordos basin and Shihongtan,Tuha basin[J].Journal of Northwest University(Natural Science Edition),2006,36(6):982-991.
[12]RITTS B D,HANSON A D,DARBY B J,et al.Sedimentary record of Triassic intraplate extension in North China:Evidence from the nonmarine NW Ordos basin,Helanshan and Zhuozishan[J].Tectonophysics,2004,386:177-202.
[13]李恒堂,吕志发.鄂尔多斯盆地延安组控煤古构造趋势分析[J].煤田地质与勘探,1996,24(5):5-8.LI Hengtang,LYU Zhifa.Trend surface analysis of the control of paleotectonics to coal accumulation of Yan’an Formation in Ordos basin[J].Coal Geology&Exploration,1996,24(5):5-8.
[14]黄克兴,侯恩科.鄂尔多斯盆地北部早、中侏罗世古气候[J].煤田地质与勘探,1988,16(3):3-8.HUANG Kexing,HOU Enke.Early-Middle Jurassic climate in Northern Ordos basin[J].Coal Geology&Exploration,1988,16(3):3-8.
[15]RAISWELL R,BUCKLEY F,BERNER R A,et al.Degree of pyritization of iron as a paleo-environmental indicator of bottom water oxygenation[J].Journal of Sedimentary Petrol,1998,58(7):812-819.
[16]苗爱生.鄂尔多斯盆地东北部砂岩型铀矿古层间氧化带特征与铀成矿的关系[D].武汉:中国地质大学,2010.
[17]APLIN A C,COLEMAN M L.Sour gas and water chemistry of the Bridport sands reservoir,Wytch Farm,UK[J].Geological Society,1995,86:303-314.
[18]SEAL R R.Sulfur Isotope Geochemistry of Sulfide Minerals[J].Mineralogy&Geochemistry,2006,61(1):633-677.
[19]HOEFS J.Stable Isotope Geochemistry(Seventh Edition)[M].West Berlin and Heidelberg:Springer international publishing,2015:73-74.
[20]焦养泉,吴立群,彭云彪,等.中国北方古亚洲构造域中沉积型铀矿形成发育的沉积-构造背景综合分析[J].地学前缘,2015,22(1):189-205.JIAO Yangquan,WU Liqun,PENG Yunbiao,et al.Sedimentarytectonic setting of the deposition-type uranium deposits forming in the Paleo-Asian tectonic domain,North China[J].Earth Science Frontiers,2015,22(1):189-205.
[21]黄文辉,敖卫华,翁成敏,等.鄂尔多斯盆地侏罗纪煤的煤岩特征及成因分析[J].现代地质,2010,24(6):1186-1197.HUANG Wenhui,AO Weihua,WENG Chengmin,et al.Characteristics of coal petrology of Jurassic coal in Ordos basin[J].Geoscience,2010,24(6):1186-1197.
[22]晋香兰,张慧.鄂尔多斯盆地东北部侏罗纪煤系烃源岩的分布特征[J].中国煤炭地质,2010,22(1):15-19.JIN Xianglan,ZHANG Hui.Distributing features of Jurassic coal measures hydrocarbon source rock in Northeastern Ordos basin[J].Coal Geology of China,2010,22(1):15-19.
[23]李小彦,王杰玲,赵平.鄂尔多斯盆地优质煤的分类与评价[J].煤田地质与勘探,2007,35(4):1-4.LI Xiaoyan,WANG Jieling,ZHAO Ping.Classification and evaluation of the high quality coal in Ordos basin[J].Coal Geology&Exploration,2007,35(4):1-4.
[24]黄文辉,唐修义.中国煤中的铀、钍和放射性核素[J].中国煤田地质,2002,14(增刊1):55-63.HUANG Wenhui,TANG Xiuyi.Uranium,Thorium and other radionuclides in coal of China[J].Coal Geology of China,2002,14(S1):55-63.
[25]杨志远,张泓,张群,等.低煤级煤与UO22+的吸附络合及亲煤型铀矿成矿过程[J].煤田地质与勘探,2009,37(5):1-5.YANG Zhiyuan,ZHANG Hong,ZHANG Qun,et al.Mechanism of uranylion adsorbing and complexing onto low-rank coal and ore-forming process of uranium associated coal measures[J].Coal Geology&Exploration,2009,37(5):1-5.
[26]刘大锰,杨起,周春光,等.华北晚古生代煤中黄铁矿赋存特征与地质成因研究[J].地球化学,1999,28(4):340-350.LIU Dameng,YANG Qi,ZHOU Chunguang,et al.Occurrence and geological genesis of pyrites in Late Paleozoic coals in North China[J].Geochimica,1999,28(4):340-350.
[27]巫声扬,王德生,马占文.四川某地沉积铀矿床中的白硒铁矿[J].岩矿测试,1982,1(4):25-29.WU Shengyang,WANG Desheng,MA Zhanwen.Discovery of ferroselite in sedimentary uranium deposit,Sichuan[J].Acta Petrologica Mineralogica ET Analytica,1982,1(4):25-29.