新疆冰草沟地区铀矿地球化学及成矿特征
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摘要
新疆冰草沟地区是我国重要火山岩型铀矿成矿远景区.以冰草沟铀矿床下二叠统塔什库拉组中亚组中铀矿石、矿化围岩和正常围岩为研究对象,针对几类岩矿石类型进行元素地球化学对比,进行宏观与微观相结合研究.冰草沟铀矿矿石中磷与铀呈高度的正相关关系,即铀、磷矿是同体共生关系.磷具有深成性并且是地幔流体的重要组成部分,推断铀源来自于地幔流体及其萃取基底岩石和围岩中的铀.根据几类岩矿石的REE地球化学特征和配分模式,推断其具有统一的沉积环境与构造背景.部分铀矿石明显富集HREE,显然在沉积成岩后期经历了(热液)改造作用.总结冰草沟地区铀矿主要经历了早期构造活化阶段、中期铀沉淀富集阶段和晚期富碳酸盐热液侵入三个成矿阶段.
Bingcaogou region of Xinjiang province is an important mineral foreground area for epithermalmesothermal volcanic type of uranium deposit.Trace element analyses were carried out for various geological bodies. There is a high degree of positive correlation between phosphorus and uranium in the ore. Also phosphorus has a deep nature and is an important component of mantle fluids, it is inferred that uranium source comes from mantle fluid and its extraction of uranium from basement rocks and surrounding rocks REE patterns suggest that the various geological bodies were initially formed from the same material sources,sedimentary environments and tectonic settings.The fact that some of the uranium ores are enriched in HREE relative to other uranium ores suggests two stages of uranium mineralization,a diagenetic stage over printed by a hydrother mal mineralization.
Bingcaogou region of Xinjiang province is an important mineral foreground area for epithermalmesothermal volcanic type of uranium deposit.Trace element analyses were carried out for various geological bodies. There is a high degree of positive correlation between phosphorus and uranium in the ore. Also phosphorus has a deep nature and is an important component of mantle fluids, it is inferred that uranium source comes from mantle fluid and its extraction of uranium from basement rocks and surrounding rocks REE patterns suggest that the various geological bodies were initially formed from the same material sources,sedimentary environments and tectonic settings.The fact that some of the uranium ores are enriched in HREE relative to other uranium ores suggests two stages of uranium mineralization,a diagenetic stage over printed by a hydrother mal mineralization.
引文
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[21]腾格尔,刘文汇,徐永昌,等.缺氧环境及地球化学叛识标志的探讨-以鄂尔多斯盆地为例[J].沉积学报,2004,22(2):365-372.
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[27]Rollison HR.Using Geochemical Dare:Evaluation,Presentations.Interpretation[M].Zimbabwe:Pearson Education Limited,1993:106-111.
[28]朱西养,汪云亮,王志畅,等.REE地球化学在砂岩型铀矿成矿研究中的应用-以川北砂岩型铀矿床为例[J].地质论评,2005,51(4):401-408.
[29]薛伟,薛春纪,池国祥,等.鄂尔多斯盆地东胜砂岩型铀矿微量和稀土元素地球化学特征[J],现代地质,2010,24(4):776-784.
[2]周宏伟,党龙,张利.新疆冰草沟矿床铀、磷相关性研究[J].新疆地质,2012,30(2):221-225.
[3]钟福军,潘家永,夏菲,等.我国火山岩型铀矿找矿预测地质模型的构建与应用[J].东华理工大学学报(自然科学版),2015,38(2):135-143.
[4]徐达淦.中国东南部火山岩型铀矿成矿构造环境、岩浆岩体系、成矿系列及成矿模式[J].华东地质学院学报,1992,15(1):11-22.
[5]弓小平,李晓光.西天山阿吾拉勒铁成矿带西段含矿地层地球化学特征及成矿过程分析[J].新疆大学学报(自然科学版),2017,34(3):273-278.
[6]杨水源.华南赣杭构造带含铀火山盆地岩浆岩的成因机制及动力学背景[D].南京:南京大学,2013.
[7]刘雷.地幔去气与铀成矿的关系-以江西相山火山岩型铀矿为例[D].北京:中国科学院,2005.
[8]毛伟,王果,李晓峰,等.新疆白杨河铀铍矿床流体包裹体研究[J].矿床地质,2013,5(32),1026-1034.
[9]赵军红,胡瑞忠,蒋国豪,等.初论地幔热柱与铀成矿的关系[J].大地构造与成矿学,2001,25(2):171-178.
[10]姜耀辉,蒋少勇,凌洪飞.地幔流体与铀成矿作用[J].地学前缘,2004,11(2):491-499.
[11]李月湘,田建吉,衣龙升,等.哈萨克斯坦与新疆北部古生代火山岩型铀矿成矿条件对比[J].世界核地质科学,2012,29(3):130-141.
[12]刘雷,胡瑞忠,商朋强,等.火山岩型铀矿床成矿构造控制特征-以俄罗斯Streltsovka火山岩型铀矿床与中国相山火山岩型铀矿床为例[J].矿物岩石地球化学通报,2005,24(4):363-368.
[13]弓小平,张晓帆,孙宝生.新疆富蕴县萨尔布拉克金矿预测区断裂特征及其控矿规律[J].新疆大学学报(自然科学版),2009,26(1):27-32.
[14]窦隆洋.遥感技术在新疆达坂城冰草沟一带铀矿地质勘查中的应用[D].乌鲁木齐:新疆大学,2015.
[15]黎彤.中国陆壳及其沉积层和上陆壳的化学元素丰度[J].地球化学,1994,23(2):140-145.
[16]Haskin LA,Haskin MA,Frey FA,et al.Relative and absolute terrestrial abundances of the rare earths[M].Oxford:Pergamon,1968:889-911.
[17]Taylor SR,Mclennan SM.The Continental Crust:Its Composition and Evolution[M].Oxford:Black well Scientif-cientific Publications,1985:1-372.
[18]黄世杰.略谈深源铀成矿与深部找矿问题[J].铀矿地质,2006,22(2):70-75.
[19]朱捌,凌洪飞,沈渭洲,等.粤北石土玲铀矿床同位素地球化学研究[J].矿床地质,2006,25(1):71-82.
[20]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):761-768.
[21]腾格尔,刘文汇,徐永昌,等.缺氧环境及地球化学叛识标志的探讨-以鄂尔多斯盆地为例[J].沉积学报,2004,22(2):365-372.
[22]杜乐天.地壳流体与地幔流体间的关系[J].地学前缘,1996(4):13-21.
[23]韩吟文,马振东,张宏飞,等.地球化学[M].北京:地质出版社,2003:181-212.
[24]陈骏,王鹤年.成矿流体作用过程中REE示踪研究[J].南京大学学报(自然科学版),1997,33(3):28-35.
[25]Fleet AR.Aqueous and sedimentary geochemistry of the rare earth elements[M].Amsterdam:Elsever,1984:331-373.
[26]Mclennan SM.Rare earth elements in sedimentary rocks:influence of provenance and sedimentary processer-[M].Chantilly:Mineralogical Society of America,1989:169-200.
[27]Rollison HR.Using Geochemical Dare:Evaluation,Presentations.Interpretation[M].Zimbabwe:Pearson Education Limited,1993:106-111.
[28]朱西养,汪云亮,王志畅,等.REE地球化学在砂岩型铀矿成矿研究中的应用-以川北砂岩型铀矿床为例[J].地质论评,2005,51(4):401-408.
[29]薛伟,薛春纪,池国祥,等.鄂尔多斯盆地东胜砂岩型铀矿微量和稀土元素地球化学特征[J],现代地质,2010,24(4):776-784.