北秦岭蓝田铀矿田产铀岩体的地球化学特征及其对成矿的制约
Geochemical Characteristics of Uranium-bearing Granite in Lantian Uranium Ore Field of North Qinling and Its Constraints on Uranium Mineralization
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摘要: 牧护关岩体西部的二长花岗岩赋存着北秦岭最著名的花岗岩型铀矿田——蓝田铀矿田。笔者对该花岗岩开展了系统的元素地球化学研究, 其结果显示牧护关二长花岗岩为富硅、富钾、富碱和高分异过铝质花岗岩;微量元素特征是花岗岩相对于原始地幔具有富集大离子元素Rb、U、La、Nd、Sm, 亏损Ba、Sr、P、Ti等特征;稀土元素分配模式为轻稀土富集的右倾型。铀矿石与二长花岗岩具有相似的稀土元素特征, 暗示铀矿床的成矿物质可能主要来源于二长花岗岩。尽管牧护关二长花岗岩的U含量远低于一般产铀岩体, 但铀在其中主要以活性的晶质铀矿形式存在, 也能被活化迁移继而成矿。晶质铀矿形式存在的铀可能在花岗岩铀成矿中起着更重要的作用。Abstract: Lantian uranium ore field, as the most famous granitic-type uranium ore field in the north Qinling area, lies in the monzogranite of west Muhuguan granitic pluton.Systematic element geochemistry studies were carried out on the Muhuguan monzogranite by the authors. The results show that the Muhuguan monzogranite is highly rich in silicon, potassium, alkaline and differentiation peraluminous. In terms of trace elements, granite is richer in LILE such as Rb, U, La, Nd, Sm and deficient in Ba, Sr, P, Ti compared with primitive mantle. The distribution pattern of rare earth elements are rightward oblique with LREE enrichment. The uranium ore has similar REE characteristics with the monzogranite, suggesting that metallogenic material of the uranium deposit might come from the monzonitic granite. Although uranium content of the Muhuguan monzogranite is much lower than that of the general uranium-bearing granitic pluton, uranium existsin Muhuguan monzogranite in the form of active uraninite, which can be activated to migrate and then mineralize. Uranium, which exists in the form of uraninite, may play a more important role in the mineralization of granitic-type uranium deposits.
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Key words:
- uraninite /
- geochemistry /
- Muhuguan monzogranite /
- Lantian uranium deposit /
- north Qinling
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陈佑纬, 毕献武, 胡瑞忠, 等. 贵东复式岩体印支期产铀和非产铀花岗岩地球化学特征对比研究[J]. 矿物岩石, 2009, 29(3): 106-114.
CHEN Youwei, BI Xianwu, HU Ruizhong, et al. Comparison of geochemical characteristic of uranium-and non-uranium-bearing Indosinian granites in Guidong composite pluton[J]. Journal of Mineralogy and Petrology, 2009, 29(3): 106-114.
陈佑纬, 毕献武, 胡瑞忠, 等. 贵东岩体黑云母成分特征及其对铀成矿的制约[J]. 矿物岩石地球化学通报, 2010, 29(4): 355-363.
CHEN Youwei, BI Xianwu, HU Ruizhong, et al.The Geochemical Characteristics of Biotites and their Constraints on Uranium Mineral ization in Guidong Pluton[J]. Bulletin of Mineralogy, Petrology and Geochemistry, 2010, 29(4): 355-363.
丁丽雪, 马昌前, 李建威, 等. 华北克拉通南缘蓝田和牧护关花岗岩体:LA-ICPMS锆石U-Pb年龄及其构造意义[J]. 地球化学, 2010, 39(5): 401-413.
DING Lixue, MA Changqian, LI Jianwei, et al.LA-ICPMS zircon U-Pb ages of the Lantian and Muhuguan granitoid plutons, southern margin of the North China craton: Implications for tectonic setting[J]. Geochimica, 2010, 39(5): 401-413.
杜乐天. 花岗岩型铀矿的主要地质规律及成矿模式[A]. 花岗岩型铀矿文集[C].1982.
DU Letian.The Geological and Metallogenic Model of the Granite-type Uranium Deposit[A]. The Proceedings of the Granite-type Uranium Deposit[C]. 1982.
刘埃平, 金景福, 钟子川. 401矿区铀矿床地质地球化学特征及其地下堆浸评价[J]. 成都理工学院学报, 2000, 27(2): 172-178.
LIU Aiping, JIN Jingfu, ZHONG Zichuan. Geological-Geochemical Characteristics and Underground Leaching Appreciation of Uranium Deposits in Orefield 401[J]. Journal of Chendu University of Technology, 2000, 27(2): 172-178.
刘锐, 陈觅, 田向盛, 等. 东秦岭蓝田和牧护关岩体地球化学、锆石SIMSU-Pb年龄及Hf同位素特征:岩石成因及构造意义[J]. 矿物学报, 2014, 34(4): 469-480.
LIU Rui, CHEN Mi, TIAN Xiangsheng, et al.Geochemical, Zircon SIMS U-Pb Geochronological and Hf Isotopic Study on Lantian and Muhuguan Plutons in Eastern Qinling, China: Petrogenesis and Tectonic Implications[J]. Acta Mineralogica Sinica, 2014, 34(4):469-480.
彭大明. 秦岭铀资源研究[J]. 铀矿地质, 1999, 15(3): 22-33.
PENG Daming. Invistigation on UraniumResources of Qinling region[J]. Uranium Geology, 1999, 15(3): 22-33.
王创铎, 马永焕. 铀地球化学教程[M]. 北京: 高等教育出版社, 1998.
WANG Chuangduo, MA Yonghuan .The lectures about the geochemistry of u ranium [M] .Beijing :Higher Education Press, 1998 .
王剑锋. 铀地球化学教程[M]. 北京: 原子能出版社, 1986.
WANG Jianfeng .The lectures about the geochemistry of uranium[ M] .Beijing :Atomic Energy Press, 1986.
王江波, 李卫红, 赖绍聪. 陕西蓝田铀矿田控矿因素与成矿作用过程探讨[J]. 西北地质, 2013, 46(1): 154-161.
WANG Jiangbo, LI Weihong, LAI Shaochong.Discussion on Ore-Control Factors and Mineralization of the Lantian Uranium Field, Shaanxi[J]. Northwestern Geology, 2013, 46(1):154-161 王晓霞, 王涛, 齐秋菊, 等. 秦岭晚中生代花岗岩时空分布、成因演变及构造意义[J]. 岩石学报, 2011, 27(6): 1573-1593.
WANG Xiaoxia, WANG Tao, QI Qiuju, et al. Temporal-spatial variations, origin and their tectonic significance of the LateMesozoic granites in the Qinling, Central China[J]. Acta Petrologica Sinica, 2011, 27(6): 1573-1593.
肖国贤, 朱焕巧. 401矿区铀资源潜力及勘探方向[J]. 西北铀矿地质, 2005, 31(2): 24-27.
XIAO Guoxian, ZHU Huanqiao. The Uranium Resource Potential and Exporation of orefield 401[J].Northwestern Uranium Geology, 2005, 31(2): 24-27.
杨正坤. 北秦岭成矿带蓝田铀矿田控矿构造地球化学特征和成矿模式研究[D]. 西安: 长安大学, 2013.
YANG Zhenkun.Lantian uranium ore field in North Qinling Mountains metallogenic belt of ore-controlling tectonic geochemistry characters and studying mineralization model[D]. Xi'an: Chang'an University, 2013.
余达淦, 吴仁贵, 陈培荣. 铀资源地质学教程[M]. 哈尔滨: 哈尔滨工程大学出版社, 2007.
YU Dagan, WU Rengui, CHEN Peirong .The geology of uranium resources [M] .Harbin :Harbin Engineering University Press, 2007.
张成江. 华南几个杂岩体中产铀与非产铀花岗岩的成因及其与铀成矿关系[J]. 成都理工学院学报, 1996, 23(4): 33-40.
ZHANG Chengjiang.The Genesis of Uranium-and Non-Uranium-Bearing Granites from Several Complexes in South China and Their Relationship to Uranium Mineralization[J]. Journal of Chendu Institute of Technology, 1996, 23(4):33-40 张聚杰. 401矿田铀矿化的基本特征及主要控矿因素的研究[R]. 咸阳: 核工业二0三研究所, 1981.
ZHANG Jujie. The Characteristic and ore-controlling factors of the Orefields 401[R]. Xianyang: No.203 Research Institute of Nuclear Industry, 1981.
张少琴, 朱文凤, 韦龙明. 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[J]. 中国矿业, 2009, 18(11): 104-106.
ZHANG Shaoqin, ZHU Weifeng, WEI Longming.Some characteristics of ulrichile in granite The wolframite of Shirenzhang in north of Guangdong as an example[J]. China Mining Magazine, 2009, 18(11): 104-106.
章邦桐. 华南两类花岗岩型铀矿床的地球化学识别标志及成因研究[J]. 华东地质学院学报, 1992, 15(2): 119-124.
ZHANG Bangtong. Study on Geochemical Recognition Criterias and Genesis for two kinds of Granite-type Uranium Deposits in South China[J]. Journal of East China Geological Institute, 1992, 15(2): 119-124.
章邦桐, 吴俊奇, 凌洪飞, 等. 赣南富城花岗岩中显微-超显微晶质铀矿的厘定及成因[J]. 矿物学报, 2011, 31(2): 166-172.
ZHANG Bangtong, WU junqi, Ling Honfei, et al. Detection of Micro and Super-Micro-Grained Uraninite in Fucheng Granite Pluton, Southern Jiangxi Province, China and Its Genetic Implication[J]. Acta Mineralogica Sinica, 2011, 31(2): 166-172.
CHEN Youwei, BI Xianwu, HU Ruizhong, et al. Element Geochemistry, Mineralogy, Geochronology and Zircon Hf Isotope of the Luxi and Xiazhuang Granites in Guangdong Province, China: Implications for U Mineralization[J]. Lithos, 2012, 150: 119-134.
CHESNER C A., ETTLINGER A D. Composition of Volcanic Allanite From the Toba Tuffs, Sumatra, Indonesia[J]. American Mineralogist, 1989, 74(7): 750-758.
COLLINS W J, BEAMS S D, WHITE A J R. Nature and origin of A-ty pe granites with particular reference to southeastern Australia[J] .Contributions to Mineralogy and Petrology, 1982, 80(2):189-200 .
CUNEY M. The Extreme Diversity of Uranium Deposits[J]. Mineralium Deposita, 2009, 44(1): 3-9.
DAHLKaMP F J. Uranium Deposits of the World [M]. Springer, 2010.
El-naby A, Hamdy H. High and Low Temperature Alteration of Uranium and Thorium Minerals, Um Ara Granites, South Eastern Desert, Egypt[J]. Ore Geology Reviews, 2009, 35(3): 436-446.
LEHMANN B. Uranium Ore Deposits[J]. Rev. Econ. Geol. Ams Online, 2008: 16-26.
MITTEFEHLDT D W, MILLER C F. Geochemistry of the Sweetwater Wash Pluton, California: Implications for "anomalous" Trace Element Behavior During Differentiation of Felsic Magmas [J]. Geochimica Et Cosmochimica Acta, 1983, 47(1): 109-124.
TARTèSE R, BOULVAIS P, POUJOL M. Uranium Mobilization from the Variscan Questembert Syntectonic Granite During Fluid-Rock Interaction at Depth[J]. Economic Geology, 2013, 108(2): 379-386.
TAYLOR S R, MCLENNAN S M. The Continental Crust: Its Composition and Evolution[M]. Blackwell Scientific Pub., Palo Alto, CA, 1985.
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