黄子进;付建明;路远发;周洁;卢友月;程顺波;

• 1:长江大学资源与环境学院
• 2:中国地质调查局武汉地质调查中心
• 3:中国地质调查局花岗岩成岩成矿地质研究中心

摘要(Abstract)：

五团岩体位于南岭地区西段,主要岩性为黑云母二长花岗岩。利用LA-ICP-MS微区原位测试技术,对五团岩体黑云母二长花岗岩进行了锆石U-Pb定年及CL显微结构分析。结果表明:2件锆石样品的~(206)Pb/~(238)U加权平均年龄分别为(211±0.95)Ma(MSWD=0.08)和(227±3.2)Ma(MSWD=1.9),结合前人获得的年龄数据,认为岩体形成于晚三叠世中期且具有多次侵位;岩石具高硅、富铝、高钾特征,w(SiO_2)70.54%~72.55%,平均71.67%;w(Al_2O_3)13.62%~14.55%,平均14.03%;w(K_2O)4.18%~5.28%,平均4.85%;全碱(Na_2O+K_2O)7.09%~7.89%,平均7.51%;K_2O/Na_2O比值1.44~4.51,平均2.02;总体属铁质、高钾钙碱性-钾玄岩系列过铝质花岗岩类;Ba、Nb、Sr、P、Ti表现为明显亏损,Rb、Th、U、K、La、Ce、Nd、Zr、Hf、Sm、Y、Yb、Lu等则相对富集,w(∑REE)62.07×10~(-6)~149.58×10~(-6),平均126.68×10~(-6),δEu值0.26~0.50,地球化学特征表明花岗岩为S型花岗岩,源岩主要为中、上地壳变质杂砂岩;花岗岩微量元素构造环境判别图解主要显示为后碰撞构造环境。基于岩石成因、构造环境判别以及区域构造演化过程,推断五团岩体形成于印支晚期后碰撞环境,是加厚地壳在碰撞应力减弱、深部压力降低等条件下部分熔融的产物。

关键词(KeyWords)： 锆石LA-ICP-MS U-Pb年龄;地球化学特征;印支期;五团岩体;南岭地区

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局地质矿产调查评价专项项目“南岭成矿带资源远景调查评价”(12120114084501);“南岭成矿带中西段地质矿产调查”(121201009000150002)

作者(Author): 黄子进;付建明;路远发;周洁;卢友月;程顺波;

Email:

DOI: 10.19509/j.cnki.dzkq.2017.0609

参考文献(References)：

• [1]Deprat J.Etude comparative des Fusulinidés d′Akasaka(Japon)et des Fusulinidés de China et d′Indochine[J].Memoire du Service Géologique Indochine,1914,3:59.
• [2]Fromagat J.Sur la structure des Indosinides[J].Comptes Rendus de 1′A cadem ic des Sciences,1932,195:538.
• [3]Meng Y H,Sun Y C,Cao Z L,et al.Adaptive extended Kalman filter(AEKF)-based mobile robot localization using sonar[J].Robotica,2000,18(5):459-473.
• [4]HsüK J,Li J,Chen H,et al.Tectonics of South China:Key to understanding West Pacific geology[J].Tectonophysics,1990,183(1/4):9-39.
• [5]李继亮.东南大陆岩石圈结构与地质演化[M].北京:冶金工业出版社,1993.
• [6]任纪舜.中国东部及邻区大陆岩石圈的构造演化与成矿[M].北京:科学出版社,1990.
• [7]郭令智,施央申,马瑞士,等.西太平洋中、新生代活动大陆边缘和岛弧构造的形成及演化[J].地质学报,1983,57(1):11-21.
• [8]郭福祥.中国南方中新生代大地构造属性和南华造山带褶皱过程[J].地质学报,1998,72(1):22-23.
• [9]郭春丽,郑佳浩,楼法生,等.华南印支期花岗岩类的岩石特征、成因类型及其构造动力学背景探讨[J].大地构造与成矿学,2012,36(3):457-472.
• [10]程顺波,付建明,马丽艳,等.桂东北越城岭-苗儿山地区印支期成矿作用:油麻岭和界牌矿区成矿花岗岩锆石U-Pb年龄和Hf同位素制约[J].中国地质,2013,40(4):1189-1201.
• [11]Wang Q,Li J W,Jian P,et al.Alkaline syenites in eastern Cathaysia(South China):Link to Permian-Triassic transtension[J].Earth&Planetary Science Letters,2005,230(3/4):339-354.
• [12]王岳军,范蔚茗,席先武,等.湖南印支期过铝质花岗岩的形成:岩浆底侵与地壳加厚热效应的数值模拟[J].地球科学:中国地质大学学报,2002,32(6):491-499.
• [13]丁兴,陈培荣,陈卫锋,等.湖南沩山花岗岩中锆石LA-ICPMSU-Pb定年:成岩启示和意义[J].中国科学:地球科学,2005,35(7):606-616.
• [14]孙涛.新编华南花岗岩分布图及其说明[J].地质通报,2006,25(3):332-335.
• [15]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.
• [16]Liu Y,Hu Z,Gao S,et al.In situ,analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard[J].Chemical Geology,2008,257(1/2):34-43.
• [17]Liu Y,Gao S,Hu Z,et al.Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons from mantle xenoliths[J].Journal of Petrology,2009,51(51):392-399.
• [18]Ludwing K R.Isoplot 3.00:A geochronological toolkit for microsoft excel[M].[S.l.]:Berkeley Geochronology Center,Special Publication No.4,2003.
• [19]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.
• [20]付建明,马昌前,谢才富,等.湖南骑田岭岩体东缘菜岭岩体的锆石SHRIMP定年及其意义[J].中国地质,2004,31(1):96-100.
• [21]周家馨.微量元素对的比值在火成岩结晶分异过程中的数字控制[J].中国科学:地球科学,1990,20(2):195-201.
• [22]陈小明,王汝成,刘昌实,等.广东从化佛冈(主体)黑云母花岗岩定年和成因[J].高校地质学报,2002,8(3):293-307.
• [23]Belousova E,Griffin W,O′Reilly S Y,et al.Igneous zircon:Trace element composition as an indicator of source rock type[J].Contributions to Mineralogy and Petrology,2002,143(5):602-622.
• [24]Douce A E P,Beard J S.Dehydration-melting of biotite gneiss and quartz amphibolite from 3to 15kbar[J].Journal of Petrology,1995,36(3):707-738.
• [25]Frost B R,Barnes C G,Collins W J,et al.A geochemical classification for granitic rocks[J].Journal of Petrology,2001,42(11):2033-2048.
• [26]Morrison G W.Characteristics and tectonic setting of the shoshonite rock association[J],Lithos,1980,13(1):97-108.
• [27]Sun S S,Mcdonough W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[J].Geological Society London Special Publications,1989,42(1):313-345.
• [28]Taylor S R,McIennan S M.The continental crust:Its composition and evolution[M].London:Blackwell,1985:57-72.
• [29]Green T H.Significance of Nh/Ta as an indicator of geochemical process in the crust-mantle system[M].Chemical Geology,1995,120(3/4):347-359.
• [30]Sylvester P J.Post-collisional strongly peraluminous granites[J].Lithos.1998,45(1/4):29-44.
• [31]Altherr R,Holl A,Hegner E,et al.High-potassium,calc-alkaline I-type plutonism in the European Variscides:Northern Vosges(France)and northern Schwarzwald(Germany)[J].Lithos,2000,50(1/3):51-73.
• [32]Wang Yuejun,Wu Chunming,Zhang Aimei,et al.Kwangsian and Indosinian reworking of the eastern South China Block:Constrains on zircon U-Pb geochronology and metamorphism of amphibolites and graulites[M].Lithos,2012,150(5):227-242.
• [33]Gilder S A,Gill J,Coe R S,et al.Isotopic and paleomagnetic constraints on the mesozoic tectonic evolution of South China[J].Journal of Geophysical Research,1996,107(7):16137-16154.
• [34]Rowley D B,Ziegler A M,Nie G.Comment on“mesozoic overthrust tectonics in South China”[J].Geology,1997,17:384-386.
• [35]周新民.对华南花岗岩研究的若干思考[J].高校地质学报,2003,9(4):556-565.
• [36]Zhou Xinmin,Sun Tao,Shen Weizhou,et al.Petrogenesis of Mesozoic granitoids and volcanic rocks in south China:A response to tectonic evolution[J].Episodes,2006,29(1):26-33.
• [37]Yu Jinhai,Wang Lijuan,Wang Xiaolei,et al.Greochemistry and geochronology of the Fucheng Complex in the southeastern Jiangxi Province[J].China Acta Petrologica Sinica,2007,23(6):1441-1456.
• [38]梁新权,李献华,丘元禧,等.华南印支期碰撞造山:十万大山盆地构造和沉积学证据[J].大地构造与成矿学,2005,29(1):99-112.
• [39]程顺波,付建明,陈希清,等.桂东北海洋山岩体锆石SHRIMP U-Pb定年和地球化学研究[J].华南地质与矿产,2012,28(2):132-140.
• [40]肖庆辉,邓晋富,马大铨,等.花岗岩研究思维与方法[M].北京:地质出版社,2002.