广东石人嶂钨矿床中的晶质铀矿研究
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摘要
石人嶂钨矿床含钨石英脉、花岗岩、云英岩中均发育有晶质铀矿。岩矿鉴定及EDS分析研究发现,铀矿与钍石构成类质同象系列(包括晶质铀矿、含钍晶质铀矿、铀钍石、含铀钍石、钍石、方钍石),它们常常与黄铁矿、磷钇矿、锆石、独居石等矿物共生。晶质铀矿成分在不同矿脉、不同中段均有变化,矿物内部成分也不稳定,可发育生长环带。XRD分析确认晶质铀矿的存在,主要成分是UO2。随着热液活动的增强,矿物颗粒的增大,晶质铀矿成分变纯,UO2含量增加;晶质铀矿常常形成黄铁矿边,次生变化在边部析出富含杂质的铀矿微粒。电子探针测试晶质铀矿的年龄为151~157Ma,与本区钨矿化年龄相吻合,跟华南地区铀矿化构成同一成矿系列,同属于燕山期成矿大爆发阶段同一成矿热液活动的产物,这对于在该地区钨矿床及外围寻找铀矿资源具有重要意义。
Uraninite has been found in tungsten-bearing quartz veins,granite and greisen in Shirenzhang Tungsten Deposit.It is shown by identification of rock-mineral and Scanning electron microscopy,energy spectrum analysis(EDS)that uraninite and thorite(including thorium-containing uraninite,uranothorites, uranium-containing thorite and thorianite)usually form the isomorphous series,and have paragenetic relation with pyrite,xenotime,zircon,monazite and so on.The uraninite's composition have variations along with different veins and levels,can form the growth zoning result from instability inside minerals; The UO2content of uraninite is increase from the greisen to the quartz vein and higher in relatively big particles of uraninite than tiny ones.There is higher of nad lower of in the marginal of uraninite mineral, but it is exactly the opposite in the centre of uraninite mineral.X-ray diffraction(XRD)analysis and electron probe confirms the presence of uraninite,and its main component is UO2.Along with the enhancement of hydrothermal activity and the growing of mineral particles,uraninite compositions become pure and uranium dioxide has an increasing trend;during epigenetic change of the uranium particle rich in impurities can be dissolved out and formed pyrite's rim formation at the edge of uraninite.The uraninite age tested by electron microprobe is approximately from 151to 157Ma,which are consistent with the age of tungsten mineralization in this area and uranium mineralization in southern China.They are belong to the occurrence of the same ore-forming hydrothermal activity of metallogenic outbreak stage during Yanshan epoch,and it is important significance on searching for uranium resources inside and around tungsten deposit in the region.
Uraninite has been found in tungsten-bearing quartz veins,granite and greisen in Shirenzhang Tungsten Deposit.It is shown by identification of rock-mineral and Scanning electron microscopy,energy spectrum analysis(EDS)that uraninite and thorite(including thorium-containing uraninite,uranothorites, uranium-containing thorite and thorianite)usually form the isomorphous series,and have paragenetic relation with pyrite,xenotime,zircon,monazite and so on.The uraninite's composition have variations along with different veins and levels,can form the growth zoning result from instability inside minerals; The UO2content of uraninite is increase from the greisen to the quartz vein and higher in relatively big particles of uraninite than tiny ones.There is higher of nad lower of in the marginal of uraninite mineral, but it is exactly the opposite in the centre of uraninite mineral.X-ray diffraction(XRD)analysis and electron probe confirms the presence of uraninite,and its main component is UO2.Along with the enhancement of hydrothermal activity and the growing of mineral particles,uraninite compositions become pure and uranium dioxide has an increasing trend;during epigenetic change of the uranium particle rich in impurities can be dissolved out and formed pyrite's rim formation at the edge of uraninite.The uraninite age tested by electron microprobe is approximately from 151to 157Ma,which are consistent with the age of tungsten mineralization in this area and uranium mineralization in southern China.They are belong to the occurrence of the same ore-forming hydrothermal activity of metallogenic outbreak stage during Yanshan epoch,and it is important significance on searching for uranium resources inside and around tungsten deposit in the region.
引文
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陈能松,孙敏,王勤燕,赵国春,陈强,舒桂明.2007.东昆仑造山带昆中带的独居石电子探针化学年龄:多期构造变质事件记录.科学通报,52(11):1297~1306.
陈强,陈能松,王勤燕,孙敏,王新宇,李晓彦,舒桂明.2006.秦岭造山带秦岭岩群独居石电子探针化学年龄:晚泛非期变质证据?科学通报,51(21):2512~2516.
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陈璋如,王安然.1984.硼矿床中的原生铀矿物—晶质铀矿和铅铀方钍石.矿物学报,4(3):259~266.
Bowles J F W.1992.用电子探针分析结果确定岩石中单颗粒晶质铀矿的年龄.见:马丽君,刘晓东,译.地质地球化学,20(2):132~136.
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付建明,李华芹,屈文俊,马丽艳,杨晓君,魏君奇,刘国庆.2008.粤北始兴地区石英脉型钨矿成矿时代的确定及其地质意义.大地构造与成矿学,32(1):57~62.
葛祥坤,秦明宽,范光.2011.电子探针化学测年法在晶质铀矿/沥青铀矿定年研究中的应用现状.世界核地质科学,28(1):55~6.
胡瑞忠.1994.花岗岩型铀矿床成因讨论以华南为例.地球科学进展,9(2):41~46.
田野,周旻玥,韦龙明,裴秋明,王莉,覃日贤,赖传勇.2014.粤北石人嶂石英脉型钨矿床流体包裹体研究——以14#脉为例.有色金属(矿山部分),待刊.
王小飞,戚华文,屈文俊,胡瑞忠,彭建堂,毕献武.2009.粤北石英脉型钨矿辉钼矿Re-Os同位素年代学.矿物学报,29(1):331~332.
韦龙明,汪劲草,朱文凤,林锦富,金凌志,冯日照,周莉莉,何勇华,张少琴,邓红卫.2008a.广东石人嶂—梅子窝钨矿研究新进展.桂林工学院学报,28(2):151~156.
韦龙明、林锦富、李文铅、汪劲草、朱文凤.2008b.广东梅子窝钨矿“五层楼”叠加现象探讨.地质学报,82(7):888~893.
韦龙明.2010.粤北仁始南矿集区成矿潜力及组合探测技术.见:王登红,陈富文,张永忠等著.南岭有色-贵金属成矿潜力及综合探测技术研究.北京:地质出版社,385~425.
吴其反,路凤香,方迎尧,卢建忠,熊盛青,范正国,朱捌.2006.广东大亚湾西北部新发现铀矿点及找矿远景讨论.岩石学报,22(8):2360~2366.
杨晓君,付建明,马丽艳,李祥能,徐德明,魏君奇.2008.粤北梅子窝钨锡矿床地质特征及其成矿年龄研究.大地构造与成矿学,32(3):346~351.
翟伟,孙晓明,邬云山,孙红英,华仁民,杨永强,李文铅,李社宏.2010.粤北梅子窝钨矿区隐伏花岗闪长岩锆石SHRIMP U-Pb年龄与40 Ar/39 Ar成矿年龄及其地质意义.高校地质学报,16(2):177~185.
张成江.1990.贵东岩体花岗岩中晶质铀矿的特征及其找矿意义.成都地质学院学报,17(3):10~18.
张广辉,韦龙明,朱文凤,彭艳华,王潇潇,王莉.2013.石人嶂钨矿晶质铀矿测年结果探讨.地质论评,59(增刊):847~848.
张少琴,朱文凤,韦龙明.2009.产铀花岗岩体中的晶质铀矿的若干特征——以粤北石人嶂钨矿为例.中国矿业,18(11):104~106.
张昭明.1982.电子探针在测定晶质铀矿年龄中的应用.放射性地质,5:408~411.
朱捌,凌洪飞,沈渭洲,高剑峰,邓平,黄国龙,谭正中.2006.粤北石土岭铀矿床同位素地球化学研究.矿床地质,25(1):71~82.
朱文凤,韦龙明,杨国高,郭威敏,刘芳.2012.石人嶂钨矿床放射性矿物的发现及初步研究.桂林理工大学学报,32(1):14~19.
Hetherington Callum J,Jercinovic Michael J,Williams Michael L.2008.Understanding geologic processes with xenotime:Composition,chronology,and a protocol for electron probe microanalysis.Chem.Geol,254:133~147.
Kample Ulf.2003.Precise electron microprobe age determination in altered uraninite:Consequences on the intrusion age and the metallogenic significance of the Kirchberg granit(Erzgebirge,Germany).Contrib.Mineral Petrol,145:107~118.
Tickyj Hugo,Hartmann Léo A,Vasconcellos Marcos A Z.2004.Electron microprobe dating of monazite substantiates ages of major geological events in the southern Brazilian shield.Journal of South American Earth Sciences,16:699~713.
Wei Longming,Zhu Wenfeng,Yang Guogao,Zhang Shaoqin,2011.Preliminary Research into Uraninite in Shirenzhang Tungsten Deposit,Guangdong,China,The International Symposium on Deep Exploration into the Lithosphere,Scientific Program&Proceedings,Beijing,China:113~116.
陈能松,孙敏,王勤燕,赵国春,陈强,舒桂明.2007.东昆仑造山带昆中带的独居石电子探针化学年龄:多期构造变质事件记录.科学通报,52(11):1297~1306.
陈强,陈能松,王勤燕,孙敏,王新宇,李晓彦,舒桂明.2006.秦岭造山带秦岭岩群独居石电子探针化学年龄:晚泛非期变质证据?科学通报,51(21):2512~2516.
陈勤五.1989.华南铀成矿期及其特征的初步探讨.矿床地质,8(3):14 ~20.
陈璋如,王安然.1984.硼矿床中的原生铀矿物—晶质铀矿和铅铀方钍石.矿物学报,4(3):259~266.
Bowles J F W.1992.用电子探针分析结果确定岩石中单颗粒晶质铀矿的年龄.见:马丽君,刘晓东,译.地质地球化学,20(2):132~136.
杜乐天,王文广.2009.华南花岗岩型铀矿找矿新目标—绢英岩化铀矿类型.铀矿地质,25(2):85~90.
付建明,李华芹,屈文俊,马丽艳,杨晓君,魏君奇,刘国庆.2008.粤北始兴地区石英脉型钨矿成矿时代的确定及其地质意义.大地构造与成矿学,32(1):57~62.
葛祥坤,秦明宽,范光.2011.电子探针化学测年法在晶质铀矿/沥青铀矿定年研究中的应用现状.世界核地质科学,28(1):55~6.
胡瑞忠.1994.花岗岩型铀矿床成因讨论以华南为例.地球科学进展,9(2):41~46.
田野,周旻玥,韦龙明,裴秋明,王莉,覃日贤,赖传勇.2014.粤北石人嶂石英脉型钨矿床流体包裹体研究——以14#脉为例.有色金属(矿山部分),待刊.
王小飞,戚华文,屈文俊,胡瑞忠,彭建堂,毕献武.2009.粤北石英脉型钨矿辉钼矿Re-Os同位素年代学.矿物学报,29(1):331~332.
韦龙明,汪劲草,朱文凤,林锦富,金凌志,冯日照,周莉莉,何勇华,张少琴,邓红卫.2008a.广东石人嶂—梅子窝钨矿研究新进展.桂林工学院学报,28(2):151~156.
韦龙明、林锦富、李文铅、汪劲草、朱文凤.2008b.广东梅子窝钨矿“五层楼”叠加现象探讨.地质学报,82(7):888~893.
韦龙明.2010.粤北仁始南矿集区成矿潜力及组合探测技术.见:王登红,陈富文,张永忠等著.南岭有色-贵金属成矿潜力及综合探测技术研究.北京:地质出版社,385~425.
吴其反,路凤香,方迎尧,卢建忠,熊盛青,范正国,朱捌.2006.广东大亚湾西北部新发现铀矿点及找矿远景讨论.岩石学报,22(8):2360~2366.
杨晓君,付建明,马丽艳,李祥能,徐德明,魏君奇.2008.粤北梅子窝钨锡矿床地质特征及其成矿年龄研究.大地构造与成矿学,32(3):346~351.
翟伟,孙晓明,邬云山,孙红英,华仁民,杨永强,李文铅,李社宏.2010.粤北梅子窝钨矿区隐伏花岗闪长岩锆石SHRIMP U-Pb年龄与40 Ar/39 Ar成矿年龄及其地质意义.高校地质学报,16(2):177~185.
张成江.1990.贵东岩体花岗岩中晶质铀矿的特征及其找矿意义.成都地质学院学报,17(3):10~18.
张广辉,韦龙明,朱文凤,彭艳华,王潇潇,王莉.2013.石人嶂钨矿晶质铀矿测年结果探讨.地质论评,59(增刊):847~848.
张少琴,朱文凤,韦龙明.2009.产铀花岗岩体中的晶质铀矿的若干特征——以粤北石人嶂钨矿为例.中国矿业,18(11):104~106.
张昭明.1982.电子探针在测定晶质铀矿年龄中的应用.放射性地质,5:408~411.
朱捌,凌洪飞,沈渭洲,高剑峰,邓平,黄国龙,谭正中.2006.粤北石土岭铀矿床同位素地球化学研究.矿床地质,25(1):71~82.
朱文凤,韦龙明,杨国高,郭威敏,刘芳.2012.石人嶂钨矿床放射性矿物的发现及初步研究.桂林理工大学学报,32(1):14~19.
Hetherington Callum J,Jercinovic Michael J,Williams Michael L.2008.Understanding geologic processes with xenotime:Composition,chronology,and a protocol for electron probe microanalysis.Chem.Geol,254:133~147.
Kample Ulf.2003.Precise electron microprobe age determination in altered uraninite:Consequences on the intrusion age and the metallogenic significance of the Kirchberg granit(Erzgebirge,Germany).Contrib.Mineral Petrol,145:107~118.
Tickyj Hugo,Hartmann Léo A,Vasconcellos Marcos A Z.2004.Electron microprobe dating of monazite substantiates ages of major geological events in the southern Brazilian shield.Journal of South American Earth Sciences,16:699~713.
Wei Longming,Zhu Wenfeng,Yang Guogao,Zhang Shaoqin,2011.Preliminary Research into Uraninite in Shirenzhang Tungsten Deposit,Guangdong,China,The International Symposium on Deep Exploration into the Lithosphere,Scientific Program&Proceedings,Beijing,China:113~116.