【作者】 黄锡强；

【导师】 王平安； 陈正乐；

【作者基本信息】 中国地质科学院 ， 矿物学、岩石学、矿床学， 2008， 硕士

【摘要】 本论文是作者参加“危机矿山接替资源勘查试点项目”(国土资发[2004]296号)之“江西省乐安县山南铀矿接替资源勘查”项目(项目编码:200436009,任务书编号:[2004]009)研究工作结果编写而成的。江西相山铀矿田是目前中国最大的火山岩型铀矿田,也是国内目前主要的铀矿产地之一。对于相山铀矿,前人做过较多的研究工作,取得了较多的研究成果。但前人的研究大都是在上世纪八十年前完成的,存在着信息陈旧,技术落后等局限性。后期虽然也有不少专家学者陆续对相山进行了研究,但在热液蚀变以及成矿物理化学条件上仍有不少的争论。本文是在收集总结前人研究资料的基础上,通过野外实地观察分析总结、电子探针以及成矿流体包裹体的研究分析等手段,探讨了矿区围岩蚀变与矿化的关系,分析了矿床的成矿物理化学条件。这对于更加有效、及时地指导相山铀矿田的找矿勘查工作,使找矿工作更有针对性,减少盲目性,缩小工作范围,提高勘查效率具有一定的理论指导意义。经过近两年的研究后,取得的主要认识如下:1.证实了前人的普遍认识,即相山铀矿田主要经历了三次大的热液蚀变过程,分别为成矿前的以钠长石化为主的蚀变(碱性蚀变),成矿期的以萤石—水云母化为主的蚀变(酸性蚀变),以及成矿后期的硅质蚀变。并且围岩蚀变跟铀矿化关系密切,矿化蚀变成带状对称分布。进一步研究认为:钠长石交代岩(碱性蚀变)的广泛分布是找矿选区的标志;钙、镁交代的存在是成矿条件优劣的评价指标:而萤石—水云母交代(酸性蚀变)的出现是富矿体赋存环境的识别依据。2.对相山四个主要的铀矿床中原生流体包裹体的研究表明:相山铀矿床流体包裹体的均一温度分布范围为140～360℃。峰值分布为:沙洲200～260℃,邹家山140～160℃,280～290℃,横涧200～210℃,南陂280～310℃,340～360℃;矿床成矿深度:沙洲0.561～1.443km,平均深度为0.965km;邹家山:0.506～1.048km,平均深度为0.775km;南陂:0.683～1.294km,平均深度为1.090km;横涧:0.504～0.756km,平均深度为0.596km;成矿压力(单位:105 Pa):沙洲为168.4～433.0,平均为289.4;邹家山为151.8～314.5,平均为232.5;南陂为204.8～388.1,平均为326.9;横涧为151.3～226.9,平均为178.7。成矿溶液的平均密度为0.93g/cm~3。从包裹体的温度、盐度、压力以及大致成矿深度可以看出,相山铀矿田的矿床分布存在着带状分布的特点,即从相山破火山口向外,各物理化学性质大致成偏高的趋势。3.相山铀矿田成矿热水溶液的来源属于大气降水和岩浆水范围,并且已发生明显的“氧漂移”;推测成矿流体C的来源可能为大气降水和岩浆岩。4.相山铀矿田的成矿铀物质主要来自于震旦—寒武纪岩石以及与小岩体有关的深源岩浆,其次还可能来自于凝固的花岗斑岩、斑状花岗岩、似斑状花岗岩及其它围岩。更多还原

【Abstract】 This paper is based on the project of "Shannan uranium ore resources exploration in Le’an County,Jiangxi Province,"(No:200436009) of "The crisis of resources prospecting and mining project"Xiangshan uranium ore field in Jiangxi province,as one of the biggest volcanic-type uranium ore deposits in China,is the major domestics uranium mining recently.Although lots of research work have been done about this ore field before the 1980s last century,the mineralized alteration and ore-forming conditions in physics and chemistry are still poorly understanding for long time.Based on the collection and field observations,the results of the electronic probe and fluid inclusions in the research and analysis,and other means to identify the rock alteration and mineralization,as well as the type of this deposit.For these can enable effective and timely guidance of uranium ore field of mineral exploration,prospecting work so that more targeted to reduce blindness,and narrow the scope of work, improving the efficiency of exploration.The main achievements of this essay include as following:1.The Xiangshan uranium ore-field experienced three major large hydrothermal alteration process:before the mineralization to the albitzation metasomatism(albitzation alteration);mineralization to the fluorite-hydrom icatization alteration(acid alteration);and the latter part of siliceous alteration.Mineralization and alteration rock close relationship with uranium mineralization,pitting a band mineralization symmetrical distribution.We can get the concluded: albitzation alteration is the wide distribution of the signs prospecting constituency;calcium,magnesium explainthe existence of mineralization conditions merits of the evaluation index,and fluorite-hydrom icatization alteration is the emergence of Rich Ore occurrence of the environment based on the identification.2.The study of the fluid inclusions in Xiangshan uranium deposit prove:a uranium deposit fluid inclusions in the uniform temperature distribution in the range of 140～360℃.Peak distribution:Shazhou 200～260℃,Zou Jiashan 140～160℃,280 "-- 290℃,Hengjian 200～210℃,Nanpi 280～310℃,340～360℃;Deposits Depth: Shazhou 0.561～1.443 km,an average depth of 0.965 km:Zou Jiashan: 0.506～1.048 km,an average depth of 0.775 km;Nanpi 0.683～1.294 km, an average depth of 1.090 km;Hengjian 0.504～0.756 km,The average depth of 0.596 km;mineralization pressure(unit:10~5 Pa):Shazhou to 168.4 from 433.0,with an average of 289.4;Zou Jiashan to 151.8 from 314.5,with an average of 232.5;Nanpi to 204.8 from 388.1,with an average of 326.9; Hengjian For 151.3 to 226.9,with an average of 178.7.the mineralization solution average density is 0.93 g/cm~2. From the fluid inclusion of temperature,salinity,pressure and depth of mineralization can be seen broadly,the field of uranium ore deposits there is a zonal distribution of the characteristics,from the crater of the mountain broke out,the physical and chemical properties generally High into the trend.3.The fluid of Xiangshan uranium deposit com from:the hydrothermal of mineralization of Xiangshan uranium deposit are come from the a source of precipitation and water of the magma,and obviously has the "oxygen drift";speculate mineralization fluid C also may be the source of water of river and the magma.4.In Xiangshan uranium deposit,U mainly come from Zhen Dan-Cambrian rocks and the deep source of magma.Secondly,it may also come from the solidification of granite porphyry,Granitic porphyry,porphyry like granite and other rocks.更多还原