鄂尔多斯盆地东胜铀矿区主要后生蚀变的地质地球化学特征及成因探讨
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摘要
研究区主要的蚀变类型有绿色化、碳酸盐化、氧化蚀变、漂白现象等,与东胜矿床中铀的富集现象一起构成了本区较为独特的一系列流体作用现象。对其地质地球化学特征及成因的研究探讨,为该区铀的富集及成因提供了十分丰富的认识。认为早期形成铀矿化的古层间氧化带在强还原性环境下,经二次还原作用改造形成了控矿的绿色蚀变带,二者皆具有低有机碳,低∑S,高Th/U的特征。铀矿化岩石其有机碳、在各蚀变阶段中最高,Th/U最低。分布于延安组顶部的漂白现象是表生氧化岩石在还原性环境下经还原改造形成,其Th/U比值高, TFe含量低。总之,绿色蚀变和漂白现象及铀矿化的形成处于一种相对较强的还原性环境,而这种环境与本区大规模发生的油气逸散作用有关。通过对“钙化木”中方解石及含矿层中方解石脉体的包裹体进行激光拉曼光谱探针测试成份、均一法测温度等的测试,认为蚀变流体主要含有天然气成分,而且这种流体为来源于沉积盆地内的低温热流体。对其它蚀变类型石英增生边和方解石胶结物的包裹体研究认为含有较多的盐水包裹体组成,流体具有常温大气水组成的特点。综合认为,本区各蚀变的流体组成由大气水、低温热液及逸散油气等成份混合组成。
     通过选择透镜状碳酸盐及”钙化木”中方解石进行碳、氧同位素分析其碳质来源与油气等有机质流体作用有关;黄铁矿中硫同位素数据分析表明,黄铁矿硫源具有生物细菌-煤质共同作用的特点;白色化岩石中高岭石氢氧同位素说明曾遭受热液作用而非风化成因;流体包裹体的氢氧同位素研究表明,成矿溶液地下水来源于表生浅层的大气降水。综合分析得出了东胜铀矿区各蚀变的形成为“大气降水-逸散油气-煤质有机酸-低温热液”混合流体作用系列结果的认识。
     进一步在实验室通过对天然气还原氧化砂岩含铀溶液的模拟研究表明,在天然气的作用下,氧化砂岩中的粘土矿物发生了一定的类型转化,并同时出现了铀的沉淀现象,这一结果很好地说明了东胜矿床铀富集及各蚀变发生的机理。
The main types of the rock alteration in study area include green alteration, carbonatization,oxidation alteration,bleaching phenomenon.Together with uranium enrichment in Dongsheng deposit,forms a unique series of fluid phenomenon. The paper deals with geological-geochemical characteristics and genesis to provide a rich understanding in generation and accumulation of uranium.Under strong reducing environment condition, the early interlayer oxidation zone was reformed and formed ore-controlling green alteration zone after twice deoxidizations. These two systems both have low organic carbon, low∑S, high Th /U. Uranium mineralizated rocks have the highest organic carbon and the lowest Th/U. The bleaching phenomenon on the top of Yan'an Formation was formed after hypergene oxydic rocks'reduction and reformation in reducing environment. The bleaching rocks have high Th /U and low TFe.In short, green alteration, bleaching phenomenon and uranium mineralizating are formed in a relatively strong environment which relates to large scale hydrocarbon dissipation in this area.The inclusions in the calcite in "calcified wood" to observe and test the composition by the Laser Raman Microprobe, the temperature is tested with the inclusion homogenization method. The results showed that the fluid mainly contained gas component and derived from hydrothermal fluids in the sedimentary basin. Based on the fluid inclusions study in the secondary concrescence of quartz edge and calcite cements in other types of rock alterations, it is found that inclusions have lots of saltwater inclusions and fluid composed with normal temperature atmospheric water. It is concluded that the alterated fluid in this area consists of atmospheric water, epithermal and dissipation hydrocarbon.
     Based on the carbon and oxygen isotope analyzing in lenticular carbonate and "calcified wood", it is found that carbon source relates fluid action of organic matter; Sulfur isotope analysis in pyrite showed that sulfur source has the characteristic between the biological bacteria and coal; The hydrogen and oxygen isotope in kaolinite showed that it suffered hydrothermal activity rather than weathering; The hydrogen and oxygen isotope in fluid inclusion showed groundwater of mineralizing fluid rooted in hypergene superficial atmospheric precipitation. It is concluded that, the formation of Dongsheng deposit is the result of mixed fluid action by " atmospheric precipitation-dissipation hydrocarbon-coal organic acids-epithermal".
     Combined with experiment on bleaching and green sandstone by fluid, proved that the clay minerals of oxidation sandstone have changed and precipitated of uranium at the same time under the gas action, it is a good model to explain enrichment of uranium in Dongsheng deposits and the alteration mechanisms.
引文
[1]Bethke C M,Marshak S.Brinemigration across north America the plate tectonics of groundwater[J].AnnualReview ofEarth and Planetary Sciences,1990,18:228-315
    [2]Bodnar B J,Revised equation and table for determining the freezing point depression of H2O-NaCl solutions[J].Geochemica et Cosmochemica Acta,1993,57:683-684
    [3]Burley S.D.,Mullis J.,and Matter A.,Timing diagenesis in the Tartan reservoir(UK North Sea):Constraints from combined cathodoluminescence microsocopy and fluid inclusion studies[J].Mar Petrol.Geol.,1989,6:98-120
    [4]Craig,H..Isotopic Variations in Meteoric Water[J].Science,1961,133,1702-1703
    [5]Crawlry R A.Sandstone Uranium Deposits in the United States:AReview of the History,Distribution,Genesis,Mining Areas and Outlook.U.S.Department of energy Assistant Secretary for Nuclear Energy Grand Junction Area Office[J].Colorado,Match,1983
    [6]Finch W I.Uranium Provinces of North America-Their Definition,Distribution,and Models[J].U S Geol Surv Bull,1996,2141:18
    [7]Geoldstein R H.Fluid inclusion in sedimentary and diagenetic systems[J].Lithos,2001,55:159-193
    [8]Giles A D.and Marshall B.,Fulid inclusion studies on a multiply deformed metamorphosed volcanic-associated massive sulfide deposit,Joma Mine,Norway.Econ[J].Geol.,1994,89:803-819
    [9]Guoxiang Chi, MartineM S. Basin fluid flow models related toZn-Pbmineralization in the southernmargin of theMaritime basin, Eastern Canada [J]. Economic Geology,1998,93(6):896-910
    [10]Granger H C, Santos E S, Dean B G, et al.Sandstone-type uranium deposits at Ambrosia Lake,New Mexico:an interim report [J]. EconomicGeology,1961,56:1179-1209
    [11]Landais P. Bitumens in uranium deposits. In:Parnell J H,Kucha Landais P.eds. Bitumens in Ore Deposits[J]. Springer-Verlag,Berlin.1993
    [12]Li Rongxi, Wang Xing.Isotope geochemistry of ore fluids forthe Dongsheng sandstone-type uranium deposit, China [J]. Chinese Journal ofGeochemistry,2007,26(2):114-122
    [13]Marray R.C.,Hydrocarbon fluid inclusions in quartz[J].AAPG Bull.1957,41:950-952
    [14]O'Reilly C, Shannon P M, Feely M. A fluid inclusion study ofcement and vein minerals from the Celtic Sea Basins, offshore Ire-land[J]. Marine and Petroleum Geology,1998,15:519-533
    [15]Parnell J. Geofluid:Origin, migration and evolution of fluids in sedimentary basin. London[M]: Geological Society Special Publication,1994:1-78
    [16]Pagel M.and Poty B.The evolution of composition temperature and pressure ofsedimentary fluids over time:a fluid inclusion reconstruction.In:Durand B.,ed.,Thermal phenomena in sedimentary basins[J].Houston,Texas:Gulf Publishing Comp.,1983,p.71-88
    [17]Pagel M.,Walgenwitz F.,and Dubessy J.,Fluid inclusions in oil and gas-bearing sedimentary formations.In:Burruss J.ed.,Thermal modeling in sedimentary basins[J].Houston,Texas:Gulf Publishing Comp.,1985,565-583
    [18]Roedder E,Fluid inclusion studies on the porphyro-type ore deposits at Bingham,Utah,Butte,Montana,and Climax,Colorado[J].Econ.Geol.,1971,66:98-120
    [19]Roedder E.,Fluid inclusion evidence on the environments of sedimentary diagenesis[J].SEPM Spec Publ.,1979,26:89-107
    [20]Roedder E,Fluid inclusion evidence for immiscibility in magmatic differentiation.Geochim.Cosmochim[J].Acta,1992,56:5-20
    [21]Sanford R F. A quantitative model of groundwater flow during formation of tabular sandstone uranium deposits [J]. Economic Geology,1994,89:341-360
    [22]Savin,S.M.,Epstein,S..The Oxygen and Hydrogen Isotope Geochemistry of Clay Minerals,Geochim,Cosmochim[J]. Acta,1971,34,25-42
    [23]Simmons S F,Gemmell J B and Sawkins F J.The santo Nino silver-lead-zinc vein,Fresnillo District,Zacatecas,Mexico:partⅡ. Physical and Chemical nature ofore-forming solutions[J].Econ Geol.,1988,83:1616-1641
    [24]Wilson P N and Petersen E U.Fluid inclusion evidence for fluid mixing in the oxec Cyprus-type copper deposit,Guatemala[J].Econ Geol.,1989,84:444-449
    [25]Wu Bolin, Xu Guowu, Liu Chiyang,et al. Alteration Effects of Hydrocarbon Dissipation in the Dongsheng Uranium Deposit, Ordos Basin-Explanation for Green Alteration and Bleaching Phenomenon[J]. ENERGY EXPLORATION AND EXPLOITATION,2009,27(3):181-199
    [26]Hugh R. Rollison著,杨学明,杨晓勇,陈双喜译.岩石地球化学[M].中国科学技术大学出版社,2000
    [27]曹蕴宁.样品制备过程对土壤有机碳同位素测定的影响因素[D].中国科学院地球环境研究所硕士学位论文,2005
    [28]陈红汉,李思田.活动热流体与成藏、成矿动力学研究进展[J].地学前缘,1996,3(4):259-262
    [29]陈勇.流体包裹体激光拉曼光谱分析原理、方法、存在的问题及未来研究方向[R].地质流体和 流体包裹体研究国际学术会议暨第十五届全国流体包裹体会议,176-177
    [30]丁万烈.绿色蚀变带的地球化学性质及其找矿意义探讨[J].铀矿地质,2003,19(5):277-282
    [31]丁燕云.鄂尔多斯盆地北部航磁反映的构造特征,物探与化探,2000,24(3):197-202
    [32]窦继忠,张复新,贾恒.内蒙古东胜砂岩型铀矿后生成矿与油气关系[J].西北地质,2005,38(4):65-71
    [33]樊爱萍,柳益群,杨仁超,等.东胜直罗组砂岩成岩作用过程与古流体运移事件分析[J].地质学报,2006,80(5):694-700
    [34]冯乔,张小莉,王云鹏,等.鄂尔多斯盆地北部上古生界油气运聚特征及其铀成矿意义[J].地质学报,2006,80(5):748-752
    [35]郭英海,刘焕杰,权彪.鄂尔多斯地区晚古生代沉积体系及古地理演化[J].沉积学报,1998,16(3):44-51
    [36]胡受奚.交代蚀变岩岩相学[M].北京:地质出版社,1980
    [37]李荣西,邸领军,席胜利.鄂尔多斯盆地米脂气田天然气逸散:流体包裹体证据[J].中国科学(D辑),2007,37(增刊):103-109
    [38]李思田,程守田,等.鄂尔多斯盆地东北部层序地层及沉积体系分析[M].北京:地质出版社,1992
    [39]李胜祥,欧光习,蔡煜琦,等.盆地流体与铀矿成矿作用[J].世界核地质科学,2005,22(1):24-30
    [40]李祥忠.青海湖介形虫碳、氧同位素测定方法及初步应用研究[D].中国科学院地球环境研究所硕士学位论文,2006
    [41]李子颖,方锡珩,陈安平,等.鄂尔多斯盆地北部砂岩型铀矿目标层灰绿色砂岩成因[J].中国科学(D辑),2007,37(增刊):139-146
    [42]刘德长,叶发旺,张杰林,等.后遥感应用技术研究与地质实践-以东胜—神木地区铀资源勘查为例[J].国土资源遥感,2004,59(1):12-14
    [43]刘建明.沉积盆地动力学和盆地流体成矿[J].矿物岩石地球化学通报,2000,19(2):76-85
    [44]刘汉彬,夏毓亮,田时丰.东胜地区砂岩型铀矿成矿年代学及成矿铀源研究[J].铀矿地质,2007,23(1):23-29
    [45]刘池洋,马艳萍,吴柏林,等.油气耗散-油气地质研究和资源评价的弱点和难点[J].石油与天然气地质,2008,29(4):517-526
    [46]刘池洋,赵红格,桂小军,等.鄂尔多斯盆地演化-改造的时空坐标及其成藏(矿)响应[J].地质学报,2006,80(5):617-638
    [47]刘池洋等.盆地多种能源矿产共存富集成藏(矿)研究进展[M].北京:科学出版社.2005
    [48]柳益群,冯乔,杨仁超,等.鄂尔多斯盆地东胜地区砂岩型铀矿成因探讨[J].地质学报,2006,80(5):761-767
    [49]卢焕章,范宏瑞,倪培,等.流体包裹体[M].北京:科学出版社,2004:154-155
    [50]马艳萍,刘池洋,赵俊峰,等.鄂尔多斯盆地东北部砂岩漂白现象与天然气逸散的关系[J].中国科学(D辑),2007,37(增刊):127-138
    [51]马艳萍,刘池洋,张复新,等.鄂尔多斯盆地东胜砂岩型高岭土矿特征及成因机制[J].吉林大学学报(地球科学版),2007,37(5):929-936
    [52]马艳萍.鄂尔多斯盆地东北部油气逸散特征及其地质效应[D].西安:西北大学博士学位论文,2007
    [53]潘爱芳,黎荣剑,赫英.鄂尔多斯盆地东胜铀矿元素地球化学特征[J].西北大学学报(自然科学版),2007,37(2):291-296
    [54]潘长春,周中毅,解启来.油气和含油气包裹体及其在油气地质地球化学研究中的意义[J].沉积学报,1996,14(4):15-23
    [55]任战利,赵重远,等.鄂尔多斯盆地古地温研究[J].沉积学报,1994,12(1):56-65
    [56]任战利.鄂尔多斯盆地热演化史与油气关系的研究[J].石油学报,1996,17(1):17-24
    [57]任战利,张盛,高胜利,等.鄂尔多斯盆地热演化程度异常分布区及其形成时期探讨[J].地质学报,2006,80(5):674-684
    [58]邵飞.水一岩相互作用及其与铀成矿关系研究:以相山铀矿田为例[D].武汉:中国地质大学博士学位论文,2007
    [59]施继锡,余孝颖.碳酸盐岩中包裹体有机质特征与非常规油气评价[J].矿物学报,1996,16(2):103-108
    [60]孙少华,刘顺生,汪集旸.鄂尔多斯盆地热流场特征[J].大地构造与成矿学,1996,20(1):29-37
    [61]涂光炽等.低温地球化学[M].北京:科学出版社,1998
    [62]妥进才,张明峰,王先彬.鄂尔多斯盆地北部东胜铀矿区沉积有机质中脂肪酸甲酯的检出及意义[J].沉积学报,2006,24(3):432-439
    [63]吴柏林,邱欣卫.论东胜矿床油气逸散蚀变的地质地球化学特点及其意义[J].中国地质,2007,34(3):455-462
    [64]吴柏林,刘池洋,王建强.层间氧化带砂岩型铀矿流体地质作用的基本特点[J].中国科学(D 辑),2007,37(增刊):157-165
    [65]吴柏林,王建强,刘池阳,等.东胜砂岩型铀矿形成中天然气地质作用的地球化学特征[J].石油与天然气地质,2006,27(2):225-232
    [66]吴柏林,刘池阳,张复新,等.东胜砂岩型铀矿后生蚀变地球化学性质及其成矿意义[J].地质学报,2006,80(5):740-747
    [67]吴柏林.中国西北地区中新生代盆地砂岩型铀矿地质与成矿作用[D].西安:西北大学博士学位论文,2005
    [68]吴仁贵,陈安平,等.沉积体系分析与河道砂岩型铀矿成矿条件讨论—以鄂尔多斯中新生代盆地东胜地区为例[J].铀矿地质,2003,19(2):94-104
    [69]王驹,杜乐天.论铀成矿过程中的气还原作用[J].铀矿地质,1995,11(1):19-24
    [70]夏毓亮,林锦荣,刘汉彬,等.中国北方主要产铀盆地砂岩型铀矿成矿年代学研究[J].铀矿地质,2003,19(3):129-136
    [71]解习农,王增明.盆地流体动力学及其研究进展[J].沉积学报,2003,21(1):19-23
    [72]向伟东,方锡珩,李田港,等.鄂尔多斯盆地东胜铀矿床成矿特征与成矿模式[J].铀矿地质,2006,22(5):257-266
    [73]向伟东,陈肇博,陈祖伊,等.试论有机质与后生砂岩型铀矿成矿作用—以吐哈盆地十红滩地区为例[J].铀矿地质,2000,16(2):65-73
    [74]肖新建.东胜地区砂岩铀矿低温流体成矿作用地球化学研究[D].北京:核工业北京地质研究院博士研究生学位论文,2004
    [75]徐步台,邵益生.浙江高岭土矿床中氢氧同位素的研究[J].地质科学,1986,(1):90-95
    [76]徐光平,翟建平,胡凯.成矿过程中流体的作用及其主要研究方法[J].地质找矿丛书,1999,14(4):1-7
    [77]许红艺,常克明.中国浅成低温热液矿床集中区的一些地质特点[J].科技资讯,2009,22:195
    [78]杨晓勇,凌明星,孙卫,等.鄂尔多斯盆地砂岩型铀矿流体包裹体研究及意义[J].石油学报,2006,26(6):30-36
    [79]杨俊杰,裴锡古.中国天然气地质学[M].北京:石油工业出版社,1996
    [80]杨兴科,杨永恒,季丽丹,等.鄂尔多斯盆地东部热力作用的期次和特点[J].地质学报,2006,80(5):705-711
    [81]张泓,李恒堂,熊存卫,等著.中国西北侏罗纪含煤地层与聚煤规律,北京:地质出版社,1998,1-317
    [82]张复新,乔海明,贾恒.内蒙古东胜砂岩型铀矿床形成条件与成矿作用[J].地质学报,2006,80(5):733-739
    [83]张抗.鄂尔多斯断块构造和资源[M].西安:陕西科学技术出版社,1989.1-394
    [84]赵俊峰,刘池洋,喻林,等.鄂尔多斯盆地侏罗系直罗组砂岩发育特征[J].沉积学报,2007,25(4):535-544
    [85]赵伦山,张本仁.地球化学[M].北京:地质出版社,1988
    [86]赵孟为,Behr H J.鄂尔多斯盆地三叠系镜质体反射率余热史[J].石油学报,1996,17(2):15-23
    [87]郑淑惠,邵益生.应用氢氧稳定同位素区分我国几个高岭土矿床的成因类型[J].北京大学学报(自然科学版),1986,(6):117-126
    [88]郑淑蕙,郑斯成,莫志超.稳定同位素地球化学分析[M].北京:北京大学出版社,1986:1-486
    [89]邹广明,李保华,毛红光,等.激光拉曼技术在流体包裹体研究中的新进展[J].内蒙古石油化工,2008,22:10-12
    [90]周新木,谈宏宇,徐招弟.蛭石对稀土离子的吸附性能研究[J].非金属矿,2004,27(2):5-7
    [91]朱西养,汪云亮,王志畅,等.东胜砂岩型铀矿微量元素地球化学特征初探[J].地质地球化学,2003,31(1):39-45

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