甘肃红石泉伟晶状白岗岩岩相学和岩石地球化学
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摘要
伟晶状白岗岩是红石泉铀矿床的含矿主岩,主要由钾长石、石英以及斜长石、黑云母、白云母组成,副矿物为黄铁矿和锆石。具有富硅(w(SiO_2)平均72.36%)、高碱(w(Na_2O+K_2O)平均8.75%),相对富钾贫钠(w(K_2O/Na_2O)平均2.67),低铁(w(TFe_2O_3)平均2.75%)、镁(w(MgO)平均0.70%)、钙(w(CaO)平均0.74%),弱过铝的特点,属于弱过铝高钾钙碱性系列岩石,具有S型花岗岩特征。微量元素Rb、Th、U、La、Ce、Nd、Zr、Hf等元素相对富集,Ba、Sr、Ti、P等元素相对亏损,具有明显的U、Th富集,Eu负异常。轻稀土元素相对富集,较重稀土元素分馏明显,球粒陨石标准化分布型式图总体略显右倾。结合该区的构造-岩浆演化特点,认为伟晶状白岗岩形成于中高温低压的后碰撞构造环境。
Pegmatoidal alaskite is a hosting rock of Hongshiquan uranium deposit,containing primary minerals k-feldspar,quartz,plagioclase,biotite and muscovite,and accessary minerals,pyrite and zircon.The characteristics of alaskite is its enriched silicon(SiO_2=72.36%),and alkali(Na_2O+K_2O=8.75%),relatively rich in potassium but depleted in Na(K_2O/Na_2O=2.67),iron(TFe_2O_3=2.75%),magnesium(MgO=0.70%),and calcium(CaO=0.74%),with weak peraluminous.It belongs to the weak aluminum high potassium calc alkaline series rocks,showing the characteristics of S type granite.The trace elements are relatively rich in Rb,Th,U,La,Ce,Nd,Zr,Hf and other elements,and depleted in Sr,Ba,Ti,P and other elements,with obvious U and Th enrichment,and Eu negative anomaly.Rare earth elements are relatively enriched light REE,and LREE fractionation of heavy REE are significant,chondrite standard of distribution pattern diagram slightly tilted to right on the whole.The characteristics of tectonic-magmatic evolution of the area shows the pegmatoidal alaskite is formed in post collisional tectonic environment of middle-high temperature and low pressure.
Pegmatoidal alaskite is a hosting rock of Hongshiquan uranium deposit,containing primary minerals k-feldspar,quartz,plagioclase,biotite and muscovite,and accessary minerals,pyrite and zircon.The characteristics of alaskite is its enriched silicon(SiO_2=72.36%),and alkali(Na_2O+K_2O=8.75%),relatively rich in potassium but depleted in Na(K_2O/Na_2O=2.67),iron(TFe_2O_3=2.75%),magnesium(MgO=0.70%),and calcium(CaO=0.74%),with weak peraluminous.It belongs to the weak aluminum high potassium calc alkaline series rocks,showing the characteristics of S type granite.The trace elements are relatively rich in Rb,Th,U,La,Ce,Nd,Zr,Hf and other elements,and depleted in Sr,Ba,Ti,P and other elements,with obvious U and Th enrichment,and Eu negative anomaly.Rare earth elements are relatively enriched light REE,and LREE fractionation of heavy REE are significant,chondrite standard of distribution pattern diagram slightly tilted to right on the whole.The characteristics of tectonic-magmatic evolution of the area shows the pegmatoidal alaskite is formed in post collisional tectonic environment of middle-high temperature and low pressure.
引文
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[41]呼延钰莹,路玉.小秦岭熊耳群火山岩锆石U-Pb年龄及其地球化学特征[J].地质科技情报,2016,35(5):1-8.
[42]Tischendorf G,Paelchen W.Zur Klassifikation von granitoiden/classification of granitoids[J].Zeitschrift fuer Geologische Wissenschaften,1985,13(5):615-627.
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[44]杨春四,张树明,赵亚云,等.甘肃红石泉铀矿床含矿主岩SrNd-Pb同位素特征及意义[J].矿物学报,2015,35(增刊1):175-176.
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[47]邓晋福,罗照华,苏尚国,等.岩石成因、构造环境与成矿作用[M].北京:地质出版社,2004.
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[2]王木清,涂江汉,伍舒梅,等.红石泉矿床含矿主岩及矿化特征[J].放射性地质,1982,9(5):390-396.
[3]杜乐天.我国花岗岩型铀矿的主要地质规律及成矿模式[C]∥佚名.花岗岩型铀矿论文集.北京:原子能出版社,1982.
[4]戎嘉树,韩泽宏,夏毓亮.我国岩体型铀矿床的矿化特征及成矿作用[J].放射性地质,1984,11(2):1-11.
[5]涂江汉.再谈红石泉铀矿床成因的若干问题[J].铀矿地质,1985,1(6):53-58.
[6]张诚,金景福.红石泉铀矿床黑云母与晶质铀矿同步富集作用探讨[J].岩石矿物学杂志,1989,8(3):24 2-250.
[7]张诚.红石泉铀矿床含矿伟晶状白岗岩成岩特征及其地质意义[J].西北地质,1989,22(1):27-34.
[8]辛存林,马维云,安国堡,等.甘肃龙首山207铀矿床成矿地质特征及其成矿机制探讨[J].地质学报,2013,87(4):577-590.
[9]辛存林,安国堡,孙现辉,等.龙首山成矿带207铀矿床矿化特征和外围铀成矿潜力分析[J].地质科技情报,2013,32(3):125-134.
[10]赵新胤,汤琳.红石泉伟晶状白岗岩型铀矿黑云母特征及成矿作用[J].现代矿业,2015,31(4):104-105.
[11]张树明,魏正宇,张良,等.龙首山碱交代型铀矿床特征和存在的问题[J].矿物学报,2013,33(增刊2):284-285.
[12]胡俊祯,蔡蕴华,巩立新,等.甘肃红石泉矿床控矿条件的研究[Z].陕西咸阳:核工业部西北地勘局二〇三研究所,1985.
[13]汤中立,白云来.华北古大陆西南边缘构造格架与成矿系统[J].地学前缘,1999,6(2):271-284.
[14]邢作云,邢集善,赵斌.华北地区深部构造特征[J].地质科技情报,2006,25(6):17-23.
[15]核工业部西北地勘局二〇三研究所.甘肃红石泉矿床控矿条件的研究[R].陕西咸阳:核工业部西北地勘局二〇三研究所,1985.
[16]路远发.GeoKit:一个用VBA构建的地球化学工具软件包[J].地球化学,2004,33(5):459-464.
[17]Wright J B.A simple alkalinity ratio and its application to question of non-orogenic granite genesis[J].Geological Magazine,1969,106(4):370-384.
[18]Peccerillo R,Taylor S R.Geochemistry of eocene calc-alkaline volcanic rocks from the Kastamonu area,Northern Tarkey[J].Contributions to Mineralogy and Petrology,1976,58:63-81.
[19]Maniar P D,Piccoli P M.Tectonic discrimination of granitoids[J].Geological Society of America Bulletin,1989,101(5):635-643.
[20]Collies W J,Beams S D,White A J R,et al.Nature and origin of A-type granites with particular reference to southeastern Australia[J].Contributions to Mineralogy and Petrology,1982,80:189-200.
[21]Sun S S,McDonough W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[C]∥Saunders A D,Norry M J.Magmatism in the Ocean Basins.[S.l.]:Geological Society Special Publications,1989,42:313-345.
[22]Taylor S R,McLennan S M.The continental crust:Its composition and evolution[M].Oxford:Blackwell,1985.
[23]黎彤,倪守斌.中国大陆岩石圈的化学元素丰度[J].地质与勘探,1997,33(1):31-37.
[24]李昌年.火成岩微量元素岩石学[M].武汉:中国地质大学出版社,1991.
[25]李献华,李武显,李正祥.再论南岭燕山早期花岗岩的成因类型与构造意义[J].科学通报,2007,52(9):981-991.
[26]施文翔,廖群安,胡远清,等.东天山地区中天山地块内中元古代花岗岩的特征及地质意义[J].地质科技情报,2010,29(1):29-37.
[27]魏庆国,高昕宇,赵太平,等.大别北麓汤家坪花岗斑岩锆石LA-ICP-MS U-Pb定年和岩石地球化学特征及其对岩石成因的制约[J].岩石学报,2010,26(5):1550-1562.
[28]李敏,李敏,程银行,等.内蒙古东乌旗巴彦都兰二长花岗岩年代学、地球化学特征及其地质意义[J].地质科技情报,2015,34(4):6-14.
[29]Chappell B W,White A J R.Two contrasting granite type[J].Pacific.Geol.,1974,8:173-174.
[30]翟明国.华北克拉通的形成演化与成矿作用[J].矿床地质,2010,29(1):24-36.
[31]Zhai M G,Gong B L,Guo J H,et al.Sm-Nd geochronology and petrography of garnet pyroxene granulites in the northern Sulu region of China and their geotectonic implication[J].Lithos,2000,52:23-33.
[32]Zhai M G,Bian A G,Zhao T P.The amalgamation of the supercontinent of North China Craton at the end of the Neo-Archaean and its breakup during Late Palaeoproterozoic and MesoProterozoic[J].Science in China:Series D,2000,43:219-232.
[33]Pearce J A,Harris Nigel B W,Tindle A G.Trace element discrimination diagram for the tectonic interpretation of granitic rocks[J].Journal of Petrology,1984,25(4):956-983.
[34]张旗,王焰,李承东,等.花岗岩按照压力的分类[J].地质通报,2006,25(11):1274-1278.
[35]肖庆辉,邓晋福,马大铨,等.花岗岩研究思维与研究方法[M].北京:地质出版社,2002:12-53.
[36]贺元凯,吴泰然,罗红玲,等.华北板块北缘中段新太古代的陆-陆碰撞事件:来自合教S型花岗岩的证据[J].北京大学学报:自然科学版,2010,46(4):571-580.
[37]余吉远,李向民,马中平,等.北祁连构造带冷龙岭地区火山岩地球化学特征及年代学[J].地质科技情报,2010,29(4):6-13.
[38]施彬,朱云海,寇晓虎,等.甘肃省榆中地区中元古代兴隆山岩群火山岩地球化学特征及构造环境[J].地质科技情报,2007,26(2):45-50.
[39]夏明哲,夏昭德,卢荣辉,等.龙首山地块的归属问题:来自地壳结构和中-新元古代地层的证据[J].地球科学与环境学报,2011,33(2):132-137.
[40]李伍平,路凤香,孙善平,等.北京西山东岭台组(J3d)火山岩的成因及其构造环境探讨[J].岩石学报,2000,16(3):345-352.
[41]呼延钰莹,路玉.小秦岭熊耳群火山岩锆石U-Pb年龄及其地球化学特征[J].地质科技情报,2016,35(5):1-8.
[42]Tischendorf G,Paelchen W.Zur Klassifikation von granitoiden/classification of granitoids[J].Zeitschrift fuer Geologische Wissenschaften,1985,13(5):615-627.
[43]Wilson M.Igneous petrogenesis[M].London:Unwin Hyman Press,1989:295-323.
[44]杨春四,张树明,赵亚云,等.甘肃红石泉铀矿床含矿主岩SrNd-Pb同位素特征及意义[J].矿物学报,2015,35(增刊1):175-176.
[45]核工业部西北地勘局二一二大队.龙首山铀矿带红石泉矿床初步勘探总结报告[R].甘肃武威:核工业部西北地勘局二一二大队,1986.
[46]Huang W L,Wyllie P J.Phase relationships of S-type granite with H2O to 35kbar:Muscovite granite from Harnet peak[J].South Dakta JGR,1981,86(B11):10515-10529.
[47]邓晋福,罗照华,苏尚国,等.岩石成因、构造环境与成矿作用[M].北京:地质出版社,2004.
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