陈迪;刘珏懿;王先辉;杨俊;马铁球;罗来;

• 1:湖南省地质调查院

摘要(Abstract)：

对湖南中生代的五峰仙岩体进行了锆石SHRIMP U-Pb定年和岩石学、岩石地球化学分析。该岩体主要由印支期的中粒斑状黑云母二长花岗岩、细粒二云母二长花岗岩组成。本次获得黑云母二长花岗岩的锆石U-Pb年龄(233.5±2.5)Ma,表明形成于晚三叠世;结合已发表的岩体年龄资料,五峰仙岩体侵位于236~233.5 Ma和221.6 Ma,具有多阶段岩浆活动特点。五峰仙花岗岩具有高的w(SiO2)、w(P2O5),含过铝质的白云母,表现为弱铝质、强铝质岩石;微量元素方面,大离子元素Rb、Th、U富集,Nb、Ba、Sr、Ti亏损明显,稀土元素配分模式右倾,轻稀土元素富集,Eu亏损相对明显以及高的Rb/Sr比值,为高成熟度陆壳物质重熔的S型花岗岩。黑云母花岗岩中发育暗色微粒包体,具淬冷结构、含长石捕获晶及呈塑形变等特征的包体为岩浆混合成因,该类花岗岩中锆石Hf同位素εHf(t)值较高,为-4.4~0.7,Hf同位素的两阶段模式年龄TDM2值为1 534~1 216Ma,变化范围较大,可能是受幔源岩浆作用所致。五峰仙岩体是在印支板块向华南板块俯冲碰撞期后(变质基底年龄258~243Ma)及华南板块与华北板块的碰撞期间(超高压变质峰期在238~218Ma)华南内陆由挤压向伸展转换的背景下形成的。

关键词(KeyWords)： 湖南;五峰仙岩体;锆石SHRIMP U-Pb年龄;S型花岗岩;伸展背景

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局项目“南岭成矿带中西段地质矿产调查”(121201009000150002);“湖南1∶5万铁丝塘、草市、冠市街、樟树脚幅区域地质矿产调查”(12120114024101)

作者(Author): 陈迪;刘珏懿;王先辉;杨俊;马铁球;罗来;

Email:

DOI: 10.19509/j.cnki.dzkq.2017.0601

参考文献(References)：

• [1]吴福元,李献华,杨进辉,等.花岗岩成因研究的若干问题[J].岩石学报,2007,23(6):1217-1238.
• [2]Pearce J A,Harris N B W,Tindle A G.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J].Journal of Petrology,1984,25(4):956-983.
• [3]Eby G N.The A-type granitoids:A review of their occurrence and chemical characteristics and speculation on their petrogenesis[J].Lithos,1990,26(1/2):115-126.
• [4]Eby G N.Chemical subdivision of the A-type granitoids:Petrogenetic and tectonic implications[J].Geology,1992,20(7):641-644.
• [5]Barbarin B.A review of the relationships between granitoid types,their origins and their geodynamic environments[J].Lithos,1999,46(3):605-626.
• [6]华仁民,毛景文.试论中国东部中生代成矿大爆发[J].矿床地质,1999,18(4),300-308.
• [7]陈沐龙,马昌前,吕昭英,等.海南岛千家复式岩体锆石U-Pb年代学及其地质意义[J].地质科技情报,2014,33(6):1-11.
• [8]邵飞,许健俊,张展适,等.江西于都马岭岩体地球化学特征及其找矿意义[J].地质科技情报,2014,33(4):19-24.
• [9]刘勇,李廷栋,肖庆辉,等.骑田岭花岗岩体的岩浆混合成因:寄主岩及其暗色闪长质包体的锆石U-Pb年龄和Hf同位素证据[J].地质科技情报,2011,30(4):19-27.
• [10]潘会彬,康志强,杨锋,等.粤北大宝山次英安斑岩中副矿物榍石的初步研究[J].地质科技情报,2014,33(3):44-50.
• [11]蔡明海,陈开旭,屈文俊,等.湘南荷花坪锡多金属矿床地质特征及辉钼矿Re-Os测年[J].矿床地质,2006,25(3):263-268.
• [12]杨锋,李晓峰,冯佐海,等.栗木锡矿云英岩化花岗岩白云母40 Ar/39 Ar年龄及其地质意义[J].桂林工学院学报,2009,29(1):21-24.
• [13]刘善宝,王登红,陈毓川,等.赣南崇义-大余-上犹矿集区不同类型含矿石英中白云母40 Ar/39 Ar年龄及其地质意义[J].地质学报,2008,82(7):932-940.
• [14]伍静,梁华英,黄文婷,等.桂东北苗儿山-越城岭南西部岩体和矿床同位素年龄及华南印支期成矿分析[J].科学通报,2012.57(13):1126-1136.
• [15]柏道远,马铁球,王先辉,等.1∶25万衡阳市幅区域地质调查报告[R].长沙:湖南省地质调查院,2005.
• [16]Wang Yuejun,Fan Weiming,Sun Min,et al.Geochronological,geochemical and geothermal constraints on petrogenesis of the Indosinian peraluminous granites in the South China Block:A case study in the Hunan Province[J].Lithos,2007,96(3):475-502.
• [17]王凯兴,陈卫锋,陈培荣,等.湖南中部地区丫江桥和五峰仙岩体地球LA-ICP-MS锆石年代学、地球化学及岩石成因研究[C]∥赵凤民.全国铀矿大基地建设学术研讨会论文集.[出版地不详]:[出版社不详],2012:468-494.
• [18]章健.华南印支期花岗岩与铀成矿:黑云母和绿泥石的制约[D].南京:南京大学,2010.
• [19]余心起,吴淦国,狄永军,等.赣南东坑盆地早侏罗世侵入岩的锆石SHRIMP测年:兼论赣南粤北地区成岩后期构造热事件[J].岩石学报,2010,26(12):3469-3484.
• [20]李洪奎,田秀林,耿科.SHRIMP锆石U-Pb测年方法简介[J].山东国土资源,2011,27(3):24-26.
• [21]宋彪,张玉海,万渝生,等.锆石SHRIMP样品靶制作、年龄测定及有关现象讨论[J].地质论评,2002,48(增刊1):26-30.
• [22]Williams I S,Claesson S.Isotope evidence for the Precambrian province and Caledonian metamorphism of high grade paragneiss from the Seve Nappes,Scandinavian Caledonides:Ⅱ.Ion microprobe zircon U-Th-Pb[J].Contrib.Mineral.Petrol.,1987,97:205-217.
• [23]Ludwing K R.Isoplot 3.0:A geochronological toolkit for Microsoft Excel[M].Berkeley:Geochronology Center Special Publication,2003:1-70.
• [24]李基宏,杨崇辉,杜利林.河北平山深熔伟晶岩锆石成因及SHRIMP U-Pb年龄[J].自然科学进展,2004,14(7):774-781.
• [25]刘勇,肖庆辉,耿树方,等.骑田岭花岗岩体的岩浆混合成因:寄主岩及其暗色闪长质微粒包体的锆石U-Pb年龄和Hf同位素证据[J].中国地质,2010,37(4):1081-1091.
• [26]Cox K G,Bell J D,Pankhurst R J.The interpretation of igneoue rock[M].[S.l.]:London George Allen and Unwin,1979.
• [27]Wilson M B.Igneous petrogenesis:A golbal tectonic approach[M].London:Springer,1989.
• [28]Maniar P D,Piccoli P M.Tcetonic discrimination of granitoids[J].Geological Society of America Bulletin,1989,101(5):635-643.
• [29]Sun S S,McDonough W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.Magmatism in the Ocean Basins[J].Geol.Soc.Spec.Publ.,1989,42:313-345.
• [30]侯可军,李延河,邹天人,等.LA-MC-ICP-MS锆石Hf同位素的分析方法及地质应用[J].岩石学报,2007,23(10):2595-2604.
• [31]侯可军,李延河,谢桂青.LA-MC-ICPMS锆石Hf同位素的分析方法及地质应用[C]∥李延河.同位素分析和定年新方法.北京:地质出版社,2011:40-48.
• [32]吴福元,李献华,郑永飞,等.Lu-Hf同位素体系及其岩石学应用[J].岩石学报,2007,23(2):185-220.
• [33]Griffin W L,Wang X,Jackson S E,et al.Zircon Chemistry and magma genesis,SE China:Ln-siut analysis of Hf isotopes,Tonglu and Pingtan igneous complexes[J].Lithos,2002,61(3):237-269.
• [34]Amelin Y,Lee D C,Halliday AN,et al.Nature of the Earth′s earliest crust from hafnium isotopes in single detrital zircons[J].Nature,1999,339:252-255.
• [35]Blichert-Toft J,Albarede F.The Lu-llf isotope geochemistry of chondrites and the evolution of the mantle-crust system[J].Earth and Planetary Science Lettary,1997,148:243-258.
• [36]Vervoort J D,Patchett P J,Blichert-Toft J,et al.Relationships between Lu-Hf and Sm-Nd isotopic systems in the global sedimentary system[J].Earth and Planetary Science Letters,1999,168:79-99.
• [37]Soderlund U,Patchett P J,Vervoot J D,et al.The 176Lu decay constant determined by Lu-Hf and U-Pb isotope systematic of Precambrian mafic intrusions[J].Earth and Planetary Science Letters,2004,219:311-324.
• [38]Griffin W L,Pearson N J,Belousova E,et al.The Hf isotope composition of cratonic mantle:LA-MC-ICPMS analysis of zircon megacrysts in kimberlites[J].Geochim.Cosmoehim.Acta,2000,64:133-147.
• [39]Whalen J B,Currie K L,Chappell B W.A-Type granites:Geochemical characteristics,discrimination and petrogenesis[J].Contrib.Miner.Petrol.,1987,95:407-419.
• [40]Bonin B.A-type granites,related rocks:Evolution of a concept,problems,prospects[J].Lithos,2007,97(1/2):1-29.
• [41]King P L,White A J R,Chappell B W,et al.Characterization and origin of aluminous A-type granites from the Lachlan fold belt,southeastern Australia[J].Journal of Petrology,1997,38(3):371-391.
• [42]张旗,冉皞,李承东.A型花岗岩的实质是什么?[J].岩石矿物学杂志,2012,31(4):621-626.
• [43]Collins 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].Contrib.Miner.Petrol.,1982,80(2):189-200.
• [44]刘昌实,陈小明,陈培荣,等.A型岩套的分类、判别标志和成因[J].高校地质学报,2003,9(4):573-591.
• [45]Clemens J D,Holloway J R,White A J R.Origin of an A-type granite:Experimental constraints[J].American Minerologist,1986,71(3/4):317-324.
• [46]Skjerlie K P,Johnston A D.Vapor-absent melting at 10kbar of a biotite-and amphibole-bearing tonalitic gneiss:Implications for the generation of A-type granite[J].Geology,1992,21(4):336-342.
• [47]Patiňo Dounce A E.Generation of metaluminous A-type granites by low-pressure melting of calc-alkaline granitoids[J].Geology,1997,25(8):743-746.
• [48]Watson R R,Harrtson T M.Zircon saturation revised:Temperature and composition effects in a variety of crustal magma types[J].Earth and Planetary Science Letters,1983,64:295-304.
• [49]王强,赵振华,熊小林.桐柏-大别造山带燕山期A型花岗岩厘定[J].岩石矿物学杂志,2000,19(4):297-306.
• [50]王涛,洪大卫,童英,等.中国阿尔泰造山带后造山喇嘛昭花岗岩体错石SHRIMP年龄、成因及陆壳垂向生长意义[J].岩石学报,2005,21(3):640-650.
• [51]Dostal J,Chatterjee A K.Contrasting behavior of Nb/Ta and Zr/Hf ratios in a peraluminous granites pluton(Nova Scotia,Canada)[J].Chem.Geol.,2000,163:207-218.
• [52]King P L,Chappell B W,Allen C M,et al.Are A-type granites the high-temperature felsic granites?:Evidence from fractionated granites of the Wangrah Suite[J].Ausralian Journal of Earth Science,2001,48:501-514.
• [53]Taylor S R,Mclennan S M.The geochemical evolution of the continental crust[J].Rev.Geophys.,1995,33:241-265.
• [54]王德滋,谢磊.岩浆混合作用:来自岩石包体的证据[J].高校地质学报,2008,14(1):16-21.
• [55]Hibbard M J.Textural anatomy of twelve magma-mixed granitic systems[C]∥Didier J,Barbarin B.Enclaves and granite petrology.Amesterdam:Elsevier,1991:431-444.
• [56]董申保.近代花岗岩研究的回顾[J].高校地质学报,1995,1(2):1-12.
• [57]王德滋,周金城.我国花岗岩研究的回顾与展望[J].岩石学报,1999,15(2):235-241.
• [58]齐有强,胡瑞忠,刘燊,等.岩浆混合作用研究综述[J].矿物岩石地球化学通报,2008,27(4):409-416.
• [59]王晓霞,王涛,卢欣祥,等.北秦岭老君山-秦岭梁环斑结构花岗岩岩浆混合的岩相学证据及其意义[J].地质通报,2002,21(8/9):523-529.
• [60]张旗,潘国强,李承东,等.花岗岩混合问题:与玄武岩对比的启示-关于花岗岩研究的思考[J].岩石学报,2007,23(5):1141-1152.
• [61]陶继华,岑涛,龙文国,等.华南印支期弱过铝质和强过铝质花岗岩中矿物化学及其岩石成因制约[J].地学前缘,2015,22(2):64-78.
• [62]Hairs N B W,Pearce J A,Tindle A G.Geochemical characteristics of collision-zone magmatism[C]∥Coward M P,Reis A C.Collision tectonics.London:Spec.Publ.Grol.Soc.Lond.,1986:67-81.
• [63]Batchelor R A,Bowden P.Petrogenetic interpretation of granitoid rock series using multicationic parameters[J].Chem.Geol.,1985,48:43-55.
• [64]Pearce J A.Sources and ettings of granitic rocks[J].Episodes,1996,19:120-125.
• [65]周新民,陈培荣,徐夕生.南岭地区晚中生代花岗岩成因与岩石圈动力学演化[M].北京:科学出版社,2007.
• [66]高万里,王宗秀,李春麟,等.浙东南印支期花岗岩的锆石U-Pb年代学、地球化学及意义[J].地质学报,2014,88(6):1055-1067.
• [67]Carter A,Roques D,Bristow C.Understanding Mesozoic accretion in southeast Asia:Significance of Triassic thermotectonism(indosinian orogeny)in Vietnam[J].Geology,2001,29:211-214.
• [68]李万友,马昌前,刘园园,等.浙江印支期铝质A型花岗岩的发现及地质意义[J].中国科学:地球科学,2012,42(2):164-177.
• [69]柏道远,陈必河,钟响,等.湘西南印支期五团岩体锆石SHRIMP U-Pb年龄、地球化学特征及形成背景[J].中国地质,2014,41(6):2002-2018.
• [70]陈迪,邵拥军,刘伟,等.湖南锡田复式花岗岩体岩石学、岩石地球化学特征[J].华南地质与矿产,2015,31(1):11-25.