伊犁盆地洪海沟地区西山窑组上段层间氧化带分布特征及其主控因素分析
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摘要
伊犁盆地洪海沟矿床作为近年来发现的大型砂岩型铀矿床,其氧化带与矿体形态均较复杂,从成矿流体空间运移与分散的角度,分析其矿体富集叠加的成因,对伊犁南缘及整个西北地区砂岩型铀矿勘查有重要的指导意义。以洪海沟矿床西山窑组上段为主要研究层位,从构造、沉积相、砂体特征和水动力等角度分析了控制氧化带空间分布的主控因素及其对铀矿化空间定位的制约。研究结果表明,斜坡带上次级纵弯背斜构造样式造成了流体补给窗的开启,同时构造坡度的变化对流体运移和汇聚起关键控制作用,辫状河主河道控制着氧化带的展布,砂体内部非均质性控制着氧化带的尖灭样式;同时,矿体的空间定位受沉积和构造双重条件制约,氧化流体主汇聚方向控制着富大矿体的空间产出,构造坡度由陡到缓的位置是成矿物质卸载的有利部位,砂体非均质性造成了流体的垂向多层分带,增加了矿体的宽度和复杂程度。
Honghaigou deposit in Yili Basin is a large sandstone type uranium deposit discovered in recent years,with the characteristics of complex oxidation zone and the ore body shape.Analyzing the causes of ore enrichment superposition of this deposit from the space of ore fluid migration and dispersion,has an important guiding meaning to the exploration in southern Yili Basin and other basins in northwest China.This paper,taking upper Xishanyao Formation as the object,studies the main controlling factors of the oxidation zone and its constraints on the spatial location of the uranium orebody by analyzing the structure,sedimentary facies,sand body characteristics and hydrodynamic.The paper suggests that longitudinal bend anticline structural style on slope opens the fluid supply window,and changes of tectonic slope are the key control on fluid migration and aggregation.Main channel of braided river controls the distribution of oxidation zone,and the sand body heterogeneity controls the oxidation zone pinchout styles.The spatial location of the ore body is restricted by both sedimentary and tectonic.Oxidation fluid of the convergence direction dominates the output of rich and large orebody.Position of slope from steep to slow makes oreforming material unloading,and sand body heterogeneity makes the fluid vertical multi zones and increases the width and complexity of the ore body.
Honghaigou deposit in Yili Basin is a large sandstone type uranium deposit discovered in recent years,with the characteristics of complex oxidation zone and the ore body shape.Analyzing the causes of ore enrichment superposition of this deposit from the space of ore fluid migration and dispersion,has an important guiding meaning to the exploration in southern Yili Basin and other basins in northwest China.This paper,taking upper Xishanyao Formation as the object,studies the main controlling factors of the oxidation zone and its constraints on the spatial location of the uranium orebody by analyzing the structure,sedimentary facies,sand body characteristics and hydrodynamic.The paper suggests that longitudinal bend anticline structural style on slope opens the fluid supply window,and changes of tectonic slope are the key control on fluid migration and aggregation.Main channel of braided river controls the distribution of oxidation zone,and the sand body heterogeneity controls the oxidation zone pinchout styles.The spatial location of the ore body is restricted by both sedimentary and tectonic.Oxidation fluid of the convergence direction dominates the output of rich and large orebody.Position of slope from steep to slow makes oreforming material unloading,and sand body heterogeneity makes the fluid vertical multi zones and increases the width and complexity of the ore body.
引文
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[11]李盛富,颜启明,王新宇,等.伊犁盆地水西沟群冲积扇-扇三角洲沉积体系研究[J].新疆地质,2006,24(3):297-304.
[12]邱余波,伊海生,王果,等.伊犁盆地洪海沟地区中侏罗统西山窑组上段沉积特征及其与铀成矿的关系[J].古地理学报,2014,16(4):537-547.
[13]陈祖伊.亚洲砂岩型铀矿区域分布规律和中国砂岩型铀矿找矿对策[J].铀矿地质,2002,18(3):129-137.
[14]黄世杰.层间氧化带砂岩型铀矿的形成条件及找矿判据[J].铀矿地质,1994,10(1):6-13.
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[16]潘蔚.伊犁盆地铀成矿时空分布特征与层间氧化带砂岩型铀矿找矿思路分析[J].铀矿地质,2000,16(1):19-25.
[17]邢东旭,康勇,王冰,等.伊犁盆地南缘洪海沟地区铀矿主要含矿含水层及水文地球化学特征[J].新疆地质,2014,32(2):240-243.
[18]任满船,李晓红,张全庆.伊犁盆地南缘侏罗系地下水演化及铀源分析[J].铀矿地质,2011,27(4):225-230.
[19]康勇,王冰.伊犁盆地南缘中西段水动力特征与铀成矿关系[C]∥中国核学会铀矿地质分会,中国核学会铀矿冶分会.全国铀矿大基地建设学术研讨会论文集(上).海口:[出版单位不详],2012:464-469.
[20]古抗衡,陈祖伊.正向构造对层间氧化带砂岩型铀矿成矿和定位的控制[J].铀矿地质,2010,26(6):361-364.
[21]陈正乐,鲁克改,王果,等.准噶尔盆地南缘新生代构造特征及其与砂岩型铀矿成矿作用初析[J].岩石学报,2010,26(2):457-470.
[22]王勇,陈正乐,刘健,等.伊犁盆地南部新构造特征及其对砂岩型铀矿的控制作用[J].大地构造与成矿学,2006,30(4):486-494.
[23]韩效忠,李胜祥,郑恩玖,等.伊犁盆地新构造运动特征及其与铀成矿关系[J].新疆地质,2004,22(4):378-381.
[24]权建平,陈宏斌,李继安,等.沉积亚相对十红滩铀矿北带铀矿化的控制作用研究[R]∥中国核学会.中国核科学技术进展报告(第2卷):中国核学会2011年学术年会论文集第1册(铀矿地质分卷).贵阳:[出版单位不详],2011:244-248.
[25]Jiao Yangquan,Wu Liqun,Wang Minfang,et al.Forecasting the occurrence of sandstone-type uranium deposits by spatial analysis:An example from the northeastern Ordos Basin,China[C]//Mao J W,Bierlein F P.Mineral deposit research:Meeting the global challenge.Berlin:Springer-Verlag,2005:273-275.
[2]戈利得什金PИ,布洛文КГ,卡里莫夫ХК.中亚自流水盆地的铀成矿作用[M].狄永强,蒋芸,夏同庆,等译.北京:地震出版社,1996.
[3]Harshman E N.Uranium rolls in the United States[J].The Mountain Geologist,1970,9(2/3):135-141.
[4]King J W,Austin S R.Some characteristics of roll-type uranium deposits at gas hills,Wyoming:US Atomic Energy Comm.Resource Appraisal Branch,Production Evaluation Div.,Grand Junction,Colo[J].Also Mining Eng.,1996,18:73-80.
[5]Dentith M,Randell M.Sandstone-type uranium deposits in South Australia and North America:A comparison of their geophysical characteristics[J].ASEG Extended Abstracts,2003,3:233-247.
[6]Bureau of Geology,CNNC.Sandstone-type uranium deposits in China:Geology and exploration techniques[M].Beijing:Atomic Energy Press,2002.
[7]张国伟,李三忠,刘俊霞,等.新疆伊犁盆地的构造特征与形成演化[J].地学前缘,1999,6(4):203-214.
[8]钟红利.伊宁凹陷构造沉积演化与有利油气区分析[D].西安:西北大学,2011.
[9]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报告[R].乌鲁木齐:核工业216大队,2012:1-153.
[10]李胜祥,韩效忠,蔡煜琦,等.伊犁盆地南缘西段中下侏罗统水西沟群沉积体系及其对铀成矿的控制作用[J].中国地质,2006,33(3):582-590.
[11]李盛富,颜启明,王新宇,等.伊犁盆地水西沟群冲积扇-扇三角洲沉积体系研究[J].新疆地质,2006,24(3):297-304.
[12]邱余波,伊海生,王果,等.伊犁盆地洪海沟地区中侏罗统西山窑组上段沉积特征及其与铀成矿的关系[J].古地理学报,2014,16(4):537-547.
[13]陈祖伊.亚洲砂岩型铀矿区域分布规律和中国砂岩型铀矿找矿对策[J].铀矿地质,2002,18(3):129-137.
[14]黄世杰.层间氧化带砂岩型铀矿的形成条件及找矿判据[J].铀矿地质,1994,10(1):6-13.
[15]阿乌巴基洛夫ХБ.水成铀矿床成因新解[R].刘平,张铁岭译.北京:核工业北京地质研究院,2011.
[16]潘蔚.伊犁盆地铀成矿时空分布特征与层间氧化带砂岩型铀矿找矿思路分析[J].铀矿地质,2000,16(1):19-25.
[17]邢东旭,康勇,王冰,等.伊犁盆地南缘洪海沟地区铀矿主要含矿含水层及水文地球化学特征[J].新疆地质,2014,32(2):240-243.
[18]任满船,李晓红,张全庆.伊犁盆地南缘侏罗系地下水演化及铀源分析[J].铀矿地质,2011,27(4):225-230.
[19]康勇,王冰.伊犁盆地南缘中西段水动力特征与铀成矿关系[C]∥中国核学会铀矿地质分会,中国核学会铀矿冶分会.全国铀矿大基地建设学术研讨会论文集(上).海口:[出版单位不详],2012:464-469.
[20]古抗衡,陈祖伊.正向构造对层间氧化带砂岩型铀矿成矿和定位的控制[J].铀矿地质,2010,26(6):361-364.
[21]陈正乐,鲁克改,王果,等.准噶尔盆地南缘新生代构造特征及其与砂岩型铀矿成矿作用初析[J].岩石学报,2010,26(2):457-470.
[22]王勇,陈正乐,刘健,等.伊犁盆地南部新构造特征及其对砂岩型铀矿的控制作用[J].大地构造与成矿学,2006,30(4):486-494.
[23]韩效忠,李胜祥,郑恩玖,等.伊犁盆地新构造运动特征及其与铀成矿关系[J].新疆地质,2004,22(4):378-381.
[24]权建平,陈宏斌,李继安,等.沉积亚相对十红滩铀矿北带铀矿化的控制作用研究[R]∥中国核学会.中国核科学技术进展报告(第2卷):中国核学会2011年学术年会论文集第1册(铀矿地质分卷).贵阳:[出版单位不详],2011:244-248.
[25]Jiao Yangquan,Wu Liqun,Wang Minfang,et al.Forecasting the occurrence of sandstone-type uranium deposits by spatial analysis:An example from the northeastern Ordos Basin,China[C]//Mao J W,Bierlein F P.Mineral deposit research:Meeting the global challenge.Berlin:Springer-Verlag,2005:273-275.