诸广山九龙江铀矿床南部石壁窝矿段稀土元素地球化学特征及其地质意义
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摘要
九龙江铀矿床位于诸广山三九地区的三江口矿区,为研究矿床南部石壁窝矿段的稀土元素地球化学特征,采取正常花岗岩、蚀变花岗岩、矿化构造岩及各类矿物的岩矿心样,进行稀土元素测试分析。结果显示,各样品均具有类似的富LREE及负Eu异常的右倾稀土配分模式。石壁窝矿段的正常花岗岩∑REE=237.26×10~(-6); LREE/HREE=12.05,(La/Yb)_N=22.31,(La/Sm)_N=3.32,(Gd/Yb)_N=3.87,稀土元素分异程度明显要高于三九地区;各样品的δEu<1、δCe≈1,反映该地段处于相对还原的环境;Sm/Nd、La/Sm-La、(La/Pr)_N、Y/Ho等值及矿物学特征均暗示该矿段岩体成岩岩浆、成矿流体可能混入少量幔源组分或受幔源流体改造。石壁窝矿段的铀矿化受LREE/HREE值、Eu/∑REE值制约,具有成矿后多期次改造的成矿地质特征,整体成矿地质背景较为优越。
Jiulongjiang uranium deposit is located in the Sanjiangkou mining area of Sanjiu area of Zhuguangshan.The geochemical characteristics of rare earth elements are studied in the rock cores of normal granite,altered granite,mineralized tectonite and various minerals from Shibiwo occurrence from the southern deposit.The results show that all the samples have similar right-handed REE distribution patterns with rich LREE and negative Eu anomalies, and their REE characteristics have certain inheritance.The REE analysis of the normal granite in the Shibiwo occurrence shows ∑REE=237.26×10~(-6), slightly higher than that in the southern China; LREE/HREE=12.05,(La/Yb)_N=22.31,(La/Sm)_N=3.32,(Gd/Yb)_N=3.87.The fractionation of REE is obviously higher than that of Sanjiu area.The δEu<1 and δCe≈1 of all samples shows that Shibiwo occurrence is in a relative reductive environment. It is suggested that the ore-forming fluids may be mixed with a small amount of mantle-derived components or modified by mantle-derived fluids by the ratios of Sm/Nd,La/Sm-La,(La/Pr)_N,Y/Ho and mantle-derived minerals.Uranium mineralization in Shibiwo occurrence is restricted by the values, both LREE/∑REE and Eu/∑REE,and characterized by multi-stage reformation after mineralization, and the metallogenic geological background is superior.
Jiulongjiang uranium deposit is located in the Sanjiangkou mining area of Sanjiu area of Zhuguangshan.The geochemical characteristics of rare earth elements are studied in the rock cores of normal granite,altered granite,mineralized tectonite and various minerals from Shibiwo occurrence from the southern deposit.The results show that all the samples have similar right-handed REE distribution patterns with rich LREE and negative Eu anomalies, and their REE characteristics have certain inheritance.The REE analysis of the normal granite in the Shibiwo occurrence shows ∑REE=237.26×10~(-6), slightly higher than that in the southern China; LREE/HREE=12.05,(La/Yb)_N=22.31,(La/Sm)_N=3.32,(Gd/Yb)_N=3.87.The fractionation of REE is obviously higher than that of Sanjiu area.The δEu<1 and δCe≈1 of all samples shows that Shibiwo occurrence is in a relative reductive environment. It is suggested that the ore-forming fluids may be mixed with a small amount of mantle-derived components or modified by mantle-derived fluids by the ratios of Sm/Nd,La/Sm-La,(La/Pr)_N,Y/Ho and mantle-derived minerals.Uranium mineralization in Shibiwo occurrence is restricted by the values, both LREE/∑REE and Eu/∑REE,and characterized by multi-stage reformation after mineralization, and the metallogenic geological background is superior.
引文
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[9]王前林,蒋红安,欧阳平宁,等.诸广中段中山地区铀矿床地质特征及找矿潜力分析[J].铀矿地质,2017,33(1):16-21.
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[11]兰鸿锋,凌洪飞,陈卫锋,等.三江口东岩体岩石成因及产铀潜力分析[J].高校地质学报,2018,24(2):172-184.
[12]费天伟,刘翔,覃金宁,等.湖南汝城三江口铀矿地质特征及成因探讨[J].南华大学学报(自然科学版),2012,26(3):39-46.
[13]张术根,袁莹,姚翠霞.南岭中段诸广山复式花岗岩岩石学及其控矿作用[J].中国有色金属学报,2014,24(6):1585-1598.
[14]GB/T 14506.30—2010,硅酸盐岩石化学分析方法第30部分:44个元素量测定[S].
[15]Sun S -s,McDonough W F.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes[M]//Saunders A D,Norry M J.Magmatism in the ocean basins.London:Geological Society Special Publication,1989,42:313-345.
[16]赵芝,王登红,陈振宇,等.南岭东段与稀土矿有关岩浆岩的成矿专属性特征[J].大地构造与成矿学,2014,38(2):255-263.
[17]Goldschmidt V M.The principles of distribution of chemical elements in minerals and rocks[J].Journal of the Chemical Society,1937,102(19):655-673.
[18]张良钜,黎琪,阮青锋,等.川南峨眉山玄武岩及其晶洞中的沥青与铜矿化矿物的REE特征与成因[J].桂林理工大学学报,2014,34(1):1-7.
[19]Shannon R D.Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides[J].Acta Crystallographica,1976,32:751-767.
[20]Brugger J,Etschmann B,Chu Y S,et al.The oxidation state of europium in hydrothermal scheelite:in situ measurement by XANES spectroscopy[J].The Canadian Mineralogist,2006,44:1079-1087.
[21]Wang Z G,Zhao Z H,Zhao H L.REE distribution patterns of granites in South China[J].Geochemistry,1982,1(1):39-50.
[22]李海东,潘家永,夏菲,等.相山李家岭铀矿床热液蚀变作用地球化学特征[J].现代地质,2016,30(3):555-566.
[23]严冰,胡瑞忠,周莉,等.江西相山铀矿田的稀土元素地球化学特征[J].矿业研究与开发,2012,32(6):48-52.
[24]黄智龙,陈进,韩润生,等.云南会泽铅锌矿床脉石矿物方解石REE地球化学[J].矿物学报,2001,21(4):659-666.
[25]Bau M,Dulski P.Comparative study of yttrium and rare-earth element behaviours in fluorine-rich hydreotheral fluids[J].Contributions to Mineralogy and Petrology,1995,119:213-223.
[26]丁振举,刘丛强,姚书振,等.海底热液系统高温流体的稀土元素组成及其控制因素[J].地球科学进展,2000,15(3):307-312.
[27]祁家明,徐争启,梁军,等.桂北376铀矿床微量元素、稀土元素地球化学特征及其意义[J].铀矿地质,2013,29(1):1-8.
[28]牟平,潘家永,黄广文,等.黄沙铀矿区221铀矿床微量、稀土元素地球化学特征及其意义[J].科学技术与工程,2016,16(29):27-33.
[29]赵振华.稀土元素地球化学研究方法[J].地质地球化学,1982(1):26-33.
[30]高善继,高艳君,翟丽娜,等.南岭两类不同成因花岗岩中的磷灰石特征[J].岩石矿物学杂志,1988,7(3):265-272.
[31]Rosenbaum J M,Wilson M,Condliffe E.Partial melts of subducted phosphatic sediments in the mantle[J].Geology,1997,25(1):77-80.
[32]杜乐天.中国热液铀矿床基本成矿规律和一般热液成矿学[M].北京:原子能出版社,2001.
[33]张岳桥,董树文,李建华,等.华南中生代大地构造研究新进展[J].地球学报,2012,33(3):257-279.
[34]李建华.华南中生代大地构造过程——源于北部大巴山和中部沅麻盆地、衡山的构造变形及年代学约束[D].北京:中国地质科学院,2013.
[35]沈渭洲,凌洪飞,孙涛,等.粤北花岗岩型铀矿的地幔流体成矿作用[C]//中国核学会.中国核科学技术进展报告(第一卷).北京:中国核学会2009年学术年会,2009:1-12.
[2]Taylor R P,Fryer B J.借助稀土元素地球化学解释热液矿床的形成[J].聂凤军,译.地质地球化学,1985(5):20-23.
[3]赵振华.微量元素地球化学[J].地球科学进展,1992,7 (5):65-66.
[4]王志畅,朱西养,汪云亮,等.岩浆岩成因类型REE判别[J].铀矿地质,2004,20(5):271-278.
[5]陈旭,姜必广,何友宇,等.湖南省汝城县三江口铀矿床普查地质报告[R].衡阳:湖南省核工业地质局三〇六大队,2013.
[6]陈旭,张宋芳.三九地区九龙江矿区铀成矿地质特征及铀矿体空间分布特征研究[J].国土资源导刊,2016,13(2):9-13.
[7]杜国升,肖振华,王先金,等.“三九”地区铀成矿地质条件及找矿前景研究[R].郴州:湖南省核工业地质局三〇二大队,2012.
[8]黄宏业,黄思东,陈培荣.湖南九曲岭地区铀矿化产出环境分析[J].铀矿地质,2006,22(5):276-280.
[9]王前林,蒋红安,欧阳平宁,等.诸广中段中山地区铀矿床地质特征及找矿潜力分析[J].铀矿地质,2017,33(1):16-21.
[10]兰鸿锋.诸广山南体“三九”地区花岗岩的成因研究和铀成矿潜力探讨[D].南京:南京大学,2015.
[11]兰鸿锋,凌洪飞,陈卫锋,等.三江口东岩体岩石成因及产铀潜力分析[J].高校地质学报,2018,24(2):172-184.
[12]费天伟,刘翔,覃金宁,等.湖南汝城三江口铀矿地质特征及成因探讨[J].南华大学学报(自然科学版),2012,26(3):39-46.
[13]张术根,袁莹,姚翠霞.南岭中段诸广山复式花岗岩岩石学及其控矿作用[J].中国有色金属学报,2014,24(6):1585-1598.
[14]GB/T 14506.30—2010,硅酸盐岩石化学分析方法第30部分:44个元素量测定[S].
[15]Sun S -s,McDonough W F.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes[M]//Saunders A D,Norry M J.Magmatism in the ocean basins.London:Geological Society Special Publication,1989,42:313-345.
[16]赵芝,王登红,陈振宇,等.南岭东段与稀土矿有关岩浆岩的成矿专属性特征[J].大地构造与成矿学,2014,38(2):255-263.
[17]Goldschmidt V M.The principles of distribution of chemical elements in minerals and rocks[J].Journal of the Chemical Society,1937,102(19):655-673.
[18]张良钜,黎琪,阮青锋,等.川南峨眉山玄武岩及其晶洞中的沥青与铜矿化矿物的REE特征与成因[J].桂林理工大学学报,2014,34(1):1-7.
[19]Shannon R D.Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides[J].Acta Crystallographica,1976,32:751-767.
[20]Brugger J,Etschmann B,Chu Y S,et al.The oxidation state of europium in hydrothermal scheelite:in situ measurement by XANES spectroscopy[J].The Canadian Mineralogist,2006,44:1079-1087.
[21]Wang Z G,Zhao Z H,Zhao H L.REE distribution patterns of granites in South China[J].Geochemistry,1982,1(1):39-50.
[22]李海东,潘家永,夏菲,等.相山李家岭铀矿床热液蚀变作用地球化学特征[J].现代地质,2016,30(3):555-566.
[23]严冰,胡瑞忠,周莉,等.江西相山铀矿田的稀土元素地球化学特征[J].矿业研究与开发,2012,32(6):48-52.
[24]黄智龙,陈进,韩润生,等.云南会泽铅锌矿床脉石矿物方解石REE地球化学[J].矿物学报,2001,21(4):659-666.
[25]Bau M,Dulski P.Comparative study of yttrium and rare-earth element behaviours in fluorine-rich hydreotheral fluids[J].Contributions to Mineralogy and Petrology,1995,119:213-223.
[26]丁振举,刘丛强,姚书振,等.海底热液系统高温流体的稀土元素组成及其控制因素[J].地球科学进展,2000,15(3):307-312.
[27]祁家明,徐争启,梁军,等.桂北376铀矿床微量元素、稀土元素地球化学特征及其意义[J].铀矿地质,2013,29(1):1-8.
[28]牟平,潘家永,黄广文,等.黄沙铀矿区221铀矿床微量、稀土元素地球化学特征及其意义[J].科学技术与工程,2016,16(29):27-33.
[29]赵振华.稀土元素地球化学研究方法[J].地质地球化学,1982(1):26-33.
[30]高善继,高艳君,翟丽娜,等.南岭两类不同成因花岗岩中的磷灰石特征[J].岩石矿物学杂志,1988,7(3):265-272.
[31]Rosenbaum J M,Wilson M,Condliffe E.Partial melts of subducted phosphatic sediments in the mantle[J].Geology,1997,25(1):77-80.
[32]杜乐天.中国热液铀矿床基本成矿规律和一般热液成矿学[M].北京:原子能出版社,2001.
[33]张岳桥,董树文,李建华,等.华南中生代大地构造研究新进展[J].地球学报,2012,33(3):257-279.
[34]李建华.华南中生代大地构造过程——源于北部大巴山和中部沅麻盆地、衡山的构造变形及年代学约束[D].北京:中国地质科学院,2013.
[35]沈渭洲,凌洪飞,孙涛,等.粤北花岗岩型铀矿的地幔流体成矿作用[C]//中国核学会.中国核科学技术进展报告(第一卷).北京:中国核学会2009年学术年会,2009:1-12.
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