阿拉善北部庆格勒地区花岗岩年代学、地球化学及岩石成因
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摘要
阿拉善地块位于华北地台西部,花岗岩广泛分布,近年来在阿拉善北缘发现了一些花岗岩多形成于晚古生代,这与以往的认识有所不同。本论文在野外地质填图的基础上对阿拉善北部庆格勒地区的花岗岩开展详细的岩石学、年代学、地球化学、全岩Sr-Nd和锆石Hf同位素综合研究,并探讨了其岩石成因。
     LA-ICP-MS锆石U-Pb定年表明,德尔和通特岩体形成于321±1Ma,早石炭世晚期;哈里努登岩体形成于284±2Ma,属早二叠世,而不是过去认为的志留纪;哈沙图岩体形成于275±1Ma,属早二叠世。结合前人研究成果,阿拉善北缘的花岗岩形成于早石炭世晚期-早二叠世,且多集中于早二叠世,该期花岗岩构成了阿拉善北缘雅布赖-诺尔公-红古尔玉林岩浆岩带的主体。
     庆格勒地区晚古生代花岗岩主要岩石类型为黑云母二长花岗岩、花岗闪长岩和钾长花岗岩,弱变形,为准铝质-弱过铝质,钙碱性-高钾钙碱性系列,部分达到钾玄岩系列。不含白云母、堇青石等矿物,暗色矿物主要为黑云母及少量角闪石,表明主要为I型花岗岩。这些花岗岩稀土元素总量较低,其中哈沙图岩体轻重稀土分馏不明显(LREE/HREE=1.0~1.7, La/Yb_N=1.3~2.8),在球粒陨石标准化图解上呈海鸥型,有较明显的铕负异常(δEu=0.07~0.20),表明其源区有斜长石残留。哈里努登、德尔和通特、牙马图岩体则相对富集轻稀土(La/Yb_N=4.1~52.8),球粒陨石标准化图解上呈右倾型,具有较明显的铕正异常或无异常,而且明显高Sr(149.9×10~(-6)~749.4×10~(-6))低Y和Yb(Y≤20×10~(-6)), Yb≤2×10~(-6)),显示出类似埃达克质岩石的地球化学特征。Sr-Nd同位素组成显示这些岩体具有低的(~(87)Sr/~(86)Sr)i值(0.70635~0.71770),和绝对值较大的负εNd(t)值(-16.4~-8.7),T_DM2为1751~2399Ma。锆石Hf同位素分析表明,庆格勒地区花岗岩锆石普遍具有很低的εHf(t)值,εHf(t)值变化范围较大,在-20~-4之间,同时具有较老的二阶段模式年龄,集中于1.5Ga~2.2Ga。揭示源区主要为古老的地壳物质,可能有少量的幔源物质贡献,证明阿拉善北部存在着古老基底。
     阿拉善北部陆缘弧可能是在晚古生代期间由古亚洲洋向阿拉善陆块俯冲所形成的,该区花岗岩具有弧花岗岩的特征,部分显示出高分异I型花岗岩特点,表明该区二叠纪是挤压环境向拉张转变的过渡时期。
The Alax block located in the west of North China platform, contains lots ofgranites with different epochs.Recent research have showed that there are somePermian granites in the northern margin of Alax, which is different from the previousperspective. This paper made detailed studies on zircon U-Pb chronology,petrology,geochemistry, Sr,Nd and Hf isotopic compositions of the granitoids in theQinggele area. The following achievements and conclusions have been made.
     LA-ICP-MS U-Pb dating of zircons from the Halinudeng pluton yields an age of284±2Ma,indicating that the formation of this plution is Early Permian.Zircon U-Pbdating yield a206Pb/208Pb age of275±1Ma of Hashatu granitoid and a206Pb/208Pb ageof321±1Ma of Deerhetongte granitoid.Combining other people’s research, the lateCarboniferous-middle Permian granites constituted main body of the northern Alaxmagmatic activity.
     The main rock types of the northern Alax magmatic rock include biotitemonzogranites, biotite-plagioclase granite and granodiorite. Geochemicalcharacteristics indicate that they are metaluminous-weakly peraluminous(A/CNK=0.98~1.08), calc-alkaline to high-K calc-alkaline rocks (Na~2O=2.5%~4.4%,K~2O=2.1%~7.3%),and the Derhetongte pluton is proved alkaline series.The mineralof the granites did not include cordierite and muscovite, and the main dark mineral isbiotite, as the characteristic of I-type granite.
     All the rocks have lower REE contents(12~198×10-6),and the Hashatu graniteshow relatively flat REE patterns, without significant fractionations of REEs(LREE/HREE=1.0~1.7, La/YbN=1.3~2.8).It has strength Eu deplete,chondrite-normalized REE pattern is―sea-gull‖type, which means plagioclase left inthe magma chamber.While the other granites is enriched in LREEs(La/YbN=4.1~52.8), and the chondrite-normalized REE pattern show theright-inclined feature, with significantly positive Eu anomalies (δEu=0.8~1.9),whichmay reflect little plagioclase left in the magma chamber.Besides, most of the granitesare high-Sr (149.9×10-6~749.4×10-6) and low-Yb (Y≤18×10-6, Yb≤1.9×10-6), similarly to the adakites.
     The granites in Qinggele area has low initial Sr isotopic radios of0.70635~0.71770and variable εNd(t) of-8.7~-16.4,the two-stage Nd depleted-mantlemodel ages(TDM2) range from1.7Ga~2.3Ga.The measurement of zircon Hf isotopic inthe granite exhibits wide range of εHf(t) values (-20~-4),and the relatively old mantlemodel ages(1.5Ga~2.2Ga).The Sr-Nd-Hf isotopic compositions suggest that thegranites were derived from the partial melting of ancient crust probably with littleadditions of mantle material and the northern margin of Alax has old metamorphicbasement.
     The late Early Carboniferous to Early Permian intrusive rocks are interpreted assubduction related magmatic rocks emplaced in an Andean-style continental marginarc during the southward subduction of the Paleo-Asian oceanic plate beneath theAlax block. The arc-related granite occurred at the structural transition fromcollisional compression to extension tectonic.
引文
Barbarin B. A review of the relationships between granitoid types,their origins and theirgeodynamic environments. Lithos,46:605~626.
    Blichert-Toft J and Albarede F.1997. The Lu-Hf isotope geochemistry of chondrites and theevolution of the mantle-crustsystem. Earth Planet Science Lett,148:243-258.
    Bonin Bernard. A-type granites and related rocks:Evolution of a concept,problems andprospects.2007,Lithos,97(1-2):1~29.
    Castro A,Moreno-Ventas I, de la Rosa JD. H-type(hybrid) granitoids: a proposed revision of thegranite-type classification and nomenclature. Earth Science Review,1991,31:237~253.
    Chappell B W and White AJR. Two contrasting granite types.Pacific Geology,1974,8:173~174.
    Chen J F,Jahn B M. Crustal evolution of southeastern China: Nd and Sr isotopicevidence.Tectonophysics,1998,284:101~133.
    DePaolo D J. Neodymium isotopes in the Colorado Front Range and crust-mantle evolution in theProterozoic. Nature,1981,291:193~196.
    Editorial Group of Regional Stratigraphic Chart of Ningxia HuiAutonomous Region. RegionalStratigraphic Chart of NorthwesternChina (Ningxia Hui Autonomous Region Fascicule).Beijing:Geological Publishing House,1978:1-188(in Chinese).
    Ewart A. The mineralogy and petrology of Tertiary-Recent orogenic volcanic rocks: With specialreference to the andesite-basaltic compositional range, in Andesites[A]. New York: JohnWiley and Sons,1982,25~95.
    Hegner, E., Walter, H.J., and Satir, M.,1995, Pb–Sr–Nd isotopic compositions and trace elementgeochemistry of megacrysts and melilitites from the Tertiary Urach volcanic field: Sourcecomposition of small volume melts under SW Germany: Contributions to Mineralogy andPetrology,122(3):322~335, doi:10.1007/s001400050131.
    Jahn BM,Wu FY,Lo CH et al.,1999. Crust-mantle interaction induced by deep subduction of thecontinental crust: Geochemical and Sr-Nd isotopic evidence from post-collisionalmafic-ultramafic intrusions of the North Dabie Complex, Central China. Chemical Geology,157:119-146.
    Jian Ping,Liu Dunyi,Kr ner A,et al. Evolution of a Permian intraoceanic arc-trench system inthe Solonker suture, Central Asian Orogenic Belt, China and Mongolia. Lithos,2010,118:169~190.
    Liu Yongsheng,Hu Zhaochu,Gao Shan,et al. In situ analysis of major and trace elements ofanhydrous minerals by LA-ICP-MS without applying an internal standard. ChemicalGeology,2008,257:34~43.
    Ludwing K R. Using Isoplot/Ex Version2,a geochronological toolkit for Microsoft Excel.Berkeley: Berkeley Geochronology Centre Special Publications,1999:1~47.
    Martin H,Smithies R H,Rapp R,et al. An overview of adakite,tonalite-trondhjemite-granodiorite(TTG),and sanukitoid: relationships and some implications for crustal evolution. Lithos,2005,79:1~24.
    Pearce J A,Harris N B W and Tindle A G. Trace element discrimination diagrams for the tectonicinterpretation of granitic rocks. Journal of Petrology,1984,25:956~983.
    Pearce JA,Harris B W and Tindle A G.Trace element discrimination diagrams for the tectonicinterpretations of granitic rocks.J.Petrol,1984,25:956~983.
    Pitcher W S. Comments on the geological environments of granites. Origin of Granite Batholits:Geochemical Evidence.[s.l.]:Shiva Publishing Limited,1979,1-8.
    Pitcher W S.The Nature and origin of granite(2ndedition).Chapman and Hall, London,1997:386
    Piteher W S. Granite type and tectonic environment.In Hsu K(ed) Mountain BuildingProcesses.Academic Press,London,1983.
    Rudnick R L. Making continental crust. Nature,1995,378:571~578.
    Soderlund U, Patchett PJ, V ervoort JD et al.2004. The176Lu decay constant determined byLu-Hf and U-Pb isotope system atics of Precambrian mafic intrusions. Earth Planet ScienceLett,219:311-324.
    Sun S S and McDonough W F. Chemical and isotopic systematics of oceanic basalts:implicationsfor mantle composition and processes[A]. Saunders A D and Norry M J. Magmatism in theOcean Basin[C]. Geological Society Special Publication,1989,42:313~345.
    Watson E B and Harrison TM.Zircon thermometer reveals minimurn melting conditions onearliest Earth.Seience,2005,308:841~844.
    Watson E B,Wark D A,Thomas J B. Crysrallization thermometers for zircon and rutile.Contrib.Mineral.petrol,2006,151:413~433.
    Xiao Wenjiao,Windley B F,Hao Jie, et al. Accretion leading to collision and the PermianSolonker suture,Inner Mongolia,China: Termination of the central Asian orogenic belt.Tectonics,2003,22(6):1069~1089.
    Zaek T,Moraes R and Klonz A.Temperature dependence of Zr in rurile:Empirical calibration ofa rutile themometer. Contrib.Mineral.Petrol.,2004,148:471~488.
    Zhang SB,Zheng YF,Wu YB,et al.Zircon U-Pb age and Hf isotope evidence for3.8Ga crustalremnant and episodic reworking of Archean crust in South China. Earth and PlanetaryScience Letters,2006,252:56~71.
    Zhang Shuanhong,Zhao Yue,Alfred Kr ner, et al. Early Permian plutons from the northern NorthChina block: constraints on continental arc evolution and convergent margin magmatismrelated to the Central Asian orogenic belt. International Journal of Earth Sciences,2009,98(6):1441~1467.
    Zhang Shuanhong,Zhao Yue,Song Biao,et al. Contrasting Late Carboniferous and LatePermian-Middle Triassic intrusive suites from the northern margin of the North China craton:geochronology,petrogenesis,and tectonic implications. Geological Society of AmericaBulletin,2009,121:181~200.
    邓晋福,赵海玲,莫宣学,等.中国大陆根柱构造-大陆动力学的钥匙.北京:地质出版社,1996,110.
    邓晋福,吴宗絮,赵国春,等.华北地台前寒武花岗岩类、陆壳演化与克拉通形成.岩石学报,1999,15(2):190-198.
    董春艳,刘敦一,李俊建,等.华北克拉通西部孔兹岩带形成时代新证据:巴彦乌拉——贺兰山地区锆石SHRIMP定年和Hf同位素组成.科学通报,2007,52(16):1913~1922.
    董申保.近代花岗岩的研究回顾.高校地质学报,1995,1(2):1~12.
    高振家,吴绍祖.1983.前寒武纪及古生代塔里木地台的构造发展[J].科学通报,28(23):1448~1450.
    葛肖虹,刘俊来.2000.被肢解的―西域克拉通‖.岩石学报,16(1):59~66.
    葛肖虹,马文璞,刘俊来,等.对中国大陆构造格架的讨论.中国地质,2009,36(5):949~965.
    耿元生,王新社,沈其韩,等.阿拉善地区新元古代晋宁期变形花岗岩的发现及其地质意义.岩石矿物学杂志,2002,21(4):412~420.
    耿元生,王新社,沈其韩,等.内蒙古阿拉善地区前寒武纪变质基底阿拉善群的再厘定.中国地质,2006,33(1):138~145.
    耿元生,周喜文.阿拉善地区新元古代岩浆事件及其地质意义.岩石矿物学杂志,2010,29(6):779~795.
    韩宝福,何国琦,王式洸,等.新疆北部后碰撞幔源岩浆活动与陆壳纵向生长.地质论评,1998,44(4):396~406.
    韩宝福,季建清,宋彪,等.新疆准噶尔晚古生代陆壳垂向生长——后碰撞深成岩浆活动的时限.岩石学报,2006,22(5):1077~1086.
    洪大卫,王式洸.花岗岩地球动力学.见肖庆辉等主编.当前地学研究的前沿领域和发展动向.地质矿产部信息研究院,1993,321~326.
    洪大卫,王式洸,谢锡林,等.兴蒙造山带正ε (Nd,t)值花岗岩的成因和大陆地壳生长.地学前缘,2000,7(2):440~456.
    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.岩石学报,2007,23(10):2595~2604.
    霍福臣,曹景轩,董燕生,等.贺兰山—阿拉善地区下、中前寒武系的划分对比及其变质、成矿作用特征.长春地质学院学报,1987,17(1):35~46.
    李锦轶,高立明,孙桂华,等.内蒙古东部双井子中三叠世同碰撞壳源花岗岩的确定及其对西伯利亚与中朝板块碰撞时限的约束.岩石学报,2007,23(3):565~582.
    李锦轶,何国琦,徐新,等.新疆北部及邻区地壳构造格架及其形成过程的初步探讨.地质学报,2006,80(1):148~168.
    李锦轶,宋彪,王克卓,等.东天山吐哈盆地南缘二叠纪幔源岩浆杂岩:中亚地区陆壳垂向生长的地质记录[J].地球学报,2006,27(5):424~446.
    李俊建,沈宝丰,李惠民,等.内蒙古西部巴彦乌拉山地区花岗闪长质片麻岩的单颗粒锆石U-Pb法年龄.地质通报,2004,23(12):1243~1245.
    李俊建.内蒙古阿拉善地块区域成矿系统:博士学位论文.北京:中国地质大学,2006.
    刘楚雄,许保良,邹天人,等.塔里木北缘及邻区海西期碱性岩岩石化学特征及其大地构造意义[J].新疆地质,2004,22(1):43~49.
    刘敦一,万渝声,伍家善,等.华北克拉通太古宙地壳演化和最古老的岩石.地质通报,2007,26(9):1131~1138
    陆松年,于海峰,金巍,等.塔里木古大陆东缘的微大陆块体群.岩石矿物学杂志,2002,21(4):317~325.
    内蒙古自治区地质矿产局.内蒙古自治区区域地质志.北京:地质出版社,1991:1~725.
    宁夏回族自治区区域地层表编写组.西北地区区域地层表(宁夏回族自治区分册).北京:地质出版社,1978:1-188.
    任纪舜,姜春发,张正坤,等.中国大地构造及其演化.北京:科学出版社,1980.
    任康绪,阎国翰,牟保磊,等.阿拉善断块富碱侵入岩Rb-Sr年龄及其地质意义.北京大学学报(自然科学版),2005,41(2):204~211.
    沈其韩,耿元生,宋彪,等.华北和扬子陆块及秦岭-大别造山带地表和深部太古宙基底的新信息.地质学报,2005a,79(5):616-627.
    沈其韩,耿元生,王新社,等.阿拉善地区前寒武纪斜长角闪岩的岩石学、地球化学、形成环境和年代学.岩石矿物学杂志,2005b,24(1):21~31.
    童英,洪大卫,王涛,等.阿尔泰造山带南缘富蕴后造山线形花岗岩体锆石U-Pb年龄及其地质意义.岩石矿物学杂志,2006,25(2):85~90.
    童英,洪大卫,王涛,等.中蒙边境中段花岗岩时空分布特征及构造和找矿意义.地球学报,2010a,31(3):395~-412.
    童英,王涛,洪大卫,等.北疆及邻区石炭——二叠纪花岗岩时空分布特征及其构造意义.岩石矿物学杂志,2010b,29(6):619~641.
    童英,王涛,洪大卫,等.中国阿尔泰北部山区早泥盆世花岗岩的年龄、成因及构造意义.岩石学报,2007,23(8):1933~1944.
    万天丰.2004.中国大地构造学纲要.北京:地质出版社,76-80.
    王德滋,周金城.我国花岗岩研究的回顾与展望.岩石学报,1999,15(2):161~169.
    王鸿桢主编.1985.中国古地理图集.北京:地图出版社,141-142.
    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锆石SHRIMP年龄、成因及陆壳垂向生长意义.岩石学报,2005,21(3):640~650.
    王涛,李伍平,李金宝,洪大卫,童英,李舢.2008.东天山东段同造山到后造山花岗岩幔源组分的递增及陆壳垂向生长意义-同位素证据.岩石学报,24(4),762~772
    王涛,童英,李舢,等.阿尔泰造山带花岗岩时空演变、构造环境及地壳生长意义——以中国阿尔泰为例.岩石矿物学杂志,2010,29(6):595~618
    王涛.花岗岩研究与大陆动力学.地学前缘,2000a,7(增刊):137~146.
    王涛.花岗岩混合成因研究及大陆动力学意义.岩石学报,2000b,16(2):161~168.
    王廷印,高军平,王金荣,等.内蒙古阿拉善北部地区碰撞期和后造山期岩浆作用.地质学报,1998b,72(2):126~137.
    王廷印,王金荣,刘金坤,等.宗乃山——沙拉扎山陆壳基底火山弧火成岩组合及地球化学特征.地球化学,1994,23:162~172.
    王廷印,王士政,王金荣.阿拉善地区古生代陆壳的形成和演化.兰州:兰州大学出版社,1994:31~178.
    王廷印,张铭杰,王金荣,等.恩格尔乌苏冲断带特征及大地构造意义.地质科学,1998a,33(4):385~394.
    吴福元,李献华,杨进辉,等.花岗岩成因研究的若干问题.岩石学报,2007,23(6):1217~1238.
    仵康林.阿拉善地区华力西晚期花岗岩类岩石地球化学特征及构造意义:硕士学位论文.西安:长安大学,2011.
    吴泰然,何国琦.内蒙古阿拉善地块北缘的构造单元划分及各单元的基本特征.地质学报,1993,62(2):97~108.
    肖庆辉,邓晋福,邱瑞照,刘勇,冯艳芳.花岗岩类与大陆地壳生长初探—以中国典型造山带花岗岩类岩石的形成为例.中国地质,2009,36(3):594~621.
    徐克勤,胡受奚,孙明志,等.论花岗岩的成因系列-以华南中生代花岗岩为例.地质学报,1983,2:107~118.
    阎志强.内蒙古阿拉善地区板块构造初探.宁夏地质,1988,(1):69~85.
    杨巍然,郭铁鹰,路元良,等.1984.中国构造演化中的“开”与“合”.地球科学—武汉地质学院学报,26(3):39-56.
    杨振德,潘行适,杨易福.阿拉善断块及邻区地质构造特征与矿产.北京:科学出版社,1988:46-75,81~96.
    张本仁,高山,张宏飞.秦岭造山带地球化学.北京:科学出版社,2002:1~87.
    张建军,王涛,张招崇等.华北地块北缘西段巴音诺尔公—狼山地区牙马图岩体的岩浆混合成因—岩相学和元素地球化学证据.地质论评,2012,58(1):53~66.
    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之一.岩石学报,2007a,23(5):1141~1152.
    张旗,潘国强,李承东,等.花岗岩结晶分离作用问题-关于花岗岩研究的思考之二.岩石学报,2007b,23(6):1239~1251.
    张旗,王焰,李承东,等.花岗岩的Sr-Yb分类及其地质意义.岩石学报,2006,22(9):2249~2269.
    张旗,王焰,王元龙.燕山期中国东部高原下地壳组成初探:埃达克质岩Sr-Nd同位素制约.岩石学报,2001,17(5):505~513.
    张拴宏,赵越,刘建民等.华北地块北缘晚古生代——早中生代岩浆活动期次、特征及构造背景.岩石矿物学杂志,2010,29(6):824~842.
    张招崇,董书云,黄河,等.西南天山二叠纪中酸性侵入岩的地质学和地球化学:岩石成因和构造背景.地质通报,2009,28(12):1827-~1839.
    张招崇,闫升好,陈柏林,等.新疆东准噶尔北部俯冲花岗岩的SHRIMP U-Pb锆石定年.科学通报,2006,51(13);1565~1574.
    张振法.1997.“北山晚华力西地槽褶皱带”(西阿拉善)的性质、归属及有关问题的探讨.内蒙古地质,1:24~40.
    周红英,莫宣学,李俊建,等.内蒙古阿拉善庆格勒图黑云斜长片麻岩单颗粒锆石U-Pb法年龄.矿物岩石地球化学通报,2007,26(3):221~223.
    周良仁.1996.阿拉善陆块中的北大山裂谷带.西北地质,17(04):1~11.①宁夏计委地质局.1976.中华人民共和国区域地质调查报告(庆格勒图幅,1:20万)

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