大兴安岭中北段大金山地区早侏罗世埃达克质花岗闪长岩的成因及构造环境
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摘要
对大兴安岭中北段大金山地区的花岗闪长岩进行了锆石LA-ICP-MS U-Pb年代学和岩石地球化学研究,以便了解其形成时代、成因及构造背景。结果表明,花岗闪长岩为早侏罗世(183. 2±1. 0 Ma)岩浆事件的产物,具有较高的SiO_2(>56%)、Al_2O_3(>15%)和较低的MgO(<3%),较高的Na_2O/K_2O值(1. 12～2. 04),为高钾钙碱性岩浆系列;具有较高的Sr含量(>400×10~(-6)),不明显的Eu异常,轻重稀土分异明显,强烈亏损Yb和Y;富集轻稀土元素,具有埃达克岩的地球化学特征。大金山岩体表现为富钾、低镁(Mg~#为38. 70)特征,属于C型埃达克质岩,推测其形成于加厚的玄武质下地壳的部分熔融。早侏罗世埃达克岩的发现表明大兴安岭中北段大金山地区有陆壳加厚的过程,大陆发生过垂向增生;大金山岩体可能形成于蒙古-鄂霍茨克洋俯冲作用下的活动大陆边缘环境。
In this paper,the zircon LA-ICP-MS U-Pb geochronology and petrogeochemistry of the granodiorite intrusive body in the Dajinshan area in the central and northern parts of Da Hinggan range have been studied in order to understand its formation age,genesis and tectonic setting. The results show that the granodiorite is the product of the early Jurassic(183. 2±1. 0 Ma) magmatic event with high contents of SiO_2(>56%),Al_2O_3(>15%) and low content of MgO(<3%),and high ratios of Na_2O/K_2O(1. 12-2. 04),which belong to high potassium calcium alkaline magma series; It is characterized with high Sr contents(>400×10~(-6)),unobvious Eu anomaly,significant differentiation between LREE and HREE,strong depletion of Yb and Y,and enrichment of LREE,similar to geochemical characteristics of adakite. In addition,it has characters of high potassium and low-magnesium(Mg~#38. 70). It belongs to the C-type adakitic rock and is presumed to be derived from the partial melting of the thickened basaltic lower crust. The discovery of early Jurassic adakite shows that a vertical thickening event occurred in the continental crust in the Dajinshan area of the Great Khingan Range at that time. the Dajinshan intrusive body could be formed in the environment of active continental margin resulted from the subduction of the Mongolian-Okhotsk ocean.
In this paper,the zircon LA-ICP-MS U-Pb geochronology and petrogeochemistry of the granodiorite intrusive body in the Dajinshan area in the central and northern parts of Da Hinggan range have been studied in order to understand its formation age,genesis and tectonic setting. The results show that the granodiorite is the product of the early Jurassic(183. 2±1. 0 Ma) magmatic event with high contents of SiO_2(>56%),Al_2O_3(>15%) and low content of MgO(<3%),and high ratios of Na_2O/K_2O(1. 12-2. 04),which belong to high potassium calcium alkaline magma series; It is characterized with high Sr contents(>400×10~(-6)),unobvious Eu anomaly,significant differentiation between LREE and HREE,strong depletion of Yb and Y,and enrichment of LREE,similar to geochemical characteristics of adakite. In addition,it has characters of high potassium and low-magnesium(Mg~#38. 70). It belongs to the C-type adakitic rock and is presumed to be derived from the partial melting of the thickened basaltic lower crust. The discovery of early Jurassic adakite shows that a vertical thickening event occurred in the continental crust in the Dajinshan area of the Great Khingan Range at that time. the Dajinshan intrusive body could be formed in the environment of active continental margin resulted from the subduction of the Mongolian-Okhotsk ocean.
引文
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Defant M J,Drummond M S.1990.Derivation of some mordern arc magmas by melting of young subducted lithosphere.Nature,347(6294):662-665
Defant M J,Xu J F,Kepezhinskas P,Wang Q,Zhang Q,Xiao L.2002.Adakites:Some variations on a theme.Acta Petrologica Sinica,18(2):129-142
Fan W M,Guo F,Wang Y J,Lin G.2003.Late Mesozoic calc-alkaline volcanism of post-orogenic extension in the northern Da Hinggan Mountains,northeastern China.Journal of Volcanology and Geothermal Research,121(1-2):115-135
Irvine T N,Baragar W R A.1971.A guide to the chemical classification of the common volcanic rocks.Canadian Journal of Earth Sciences,8(5):523-548
Kay R W,Kay S M.2002.Andean adakites:Three ways to make them.Acta Petrologica Sinica,18(3):303-311
Liu Y S,Hu Z C,Gao S,Günther D,Xu J,Gao C G,Chen H H.2008.In situ analysis of Major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard.Chemical Geology,257(1-2):34-43
Liu Y S,Hu Z C,Zong K Q,Gao C G,Gai S,Xu J,Chen H H.2010.Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LA-ICP-MS.Chinese Science Bulletin,55(15):1535-1546
Maniar P D,Piccoli P M.1989.Tectonic discrimination of granitoids.GSA Bulletin,101(5):635-643
Pearce T H.1968.A contribution to the theory of variation diagrams.Contributions to Mineralogy&Petrology,19(2):142-157.
Pearce J A.1982.Trace element characteristics of lavas from destructive plate boundaries.Andesites,528-548.
Rickwood P C.1989.Boundary lines within petrologic diagrams which use oxides of major and minor elements.Lithos,22(4):247-263
Sun S S,Mc Donough W F.1989.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.In:Saunders A D,Norry M J(eds.).Magmatism in the Ocean Basins.Geological Society,London,Special Publication,42(1):313-345
Wang W,Tang J,Xu W L,Wang F.2015.Geochronology and geochemistry of Early Jurassic volcanic rocks in the Erguna Massif,northeast China:Petrogenesis and implications for the tectonic evolution of the Mongol-Okhotsk suture belt.Lithos,218-219:73-86
Wu F Y,Sun D Y,Ge W C,Zhang Y B,Grant M L,Wilde S A,Jahn B M.2011.Geochronology of the Phanerozoic granitoids in northeastern China.Journal of Asian Earth Sciences,41(1):1-30
Xu J F,Shinjio R,Defant M J,Wing Q,Rapp R P.2002.Origin of Mesozoic adakitic intrusive rocks in the Ningzhen area of East China:Partial melting of delaminated lower continental crust?Geology,30(12):1111-1114
Xu W L,Ji W Q,Pei F P,Meng E,Yu Y,Yang D B,Zhang X Z.2009.Triassic volcanism in eastern Heilongjiang and Jilin provinces,NE China:Chronology,geochemistry,and tectonic implications.Journal of Asian Earth Sciences,34(3):392-402
邓晋福,罗照华,苏尚国.2004.岩石成因、构造环境与成矿作用.北京:地质出版社
黄始琪,董树文,胡健民,施炜,陈宣华,刘志强.2016.蒙古-鄂霍次克构造带的形成与演化.地质学报,90(9):2192-2205
李仰春,张克信,吴淦国,肖庆辉,杨晓平,张达,赵焕利,韩振哲,刘旭光.2013.大-小兴安岭接合部早-中侏罗世侵入岩SHRIMP锆石U-Pb定年及成因.地质通报,32(5):717-729
李宇,许文良,王枫,唐杰,赵硕.2015.蒙古-鄂霍茨克洋的闭合时间:来自白云母花岗岩年代学与地球化学证据.见:中国矿物岩石地球化学学会第15届学术年会论文摘要集(1).长春:中国矿物岩石地球化学学会
李长珠.1999.额尔古纳成矿带金铜多金属矿成矿条件和成矿系列.有色金属矿产与勘查,8(6):329-332
梁玉伟,余存林,沈国珍,孙庆茹,李进文,杨郧城,佘宏全,张斌,谭刚.2013.内蒙古东乌旗索纳嘠铅锌银矿区花岗岩地球化学特征及其构造与成矿意义.中国地质,40(3):767-779
柳小明,高山,第五春容,袁洪林,胡兆初.2007.单颗粒锆石的20μm小斑束原位微区LA-ICP-MS U-Pb年龄和微量元素的同时测定.科学通报,52(2):228-235
孟恩,许文良,杨德彬,邱坤峰,李长华,祝洪涛.2011.满洲里地区灵泉盆地中生代火山岩的锆石U-Pb年代学、地球化学及其地质意义.岩石学报,27(4):1209-1226
孟凡超,刘嘉麒,崔岩,高金亮,刘祥,童英.2014.中国东北地区中生代构造体制的转变:来自火山岩时空分布与岩石组合的制约.岩石学报,30(12):3569-3586
潘少逵.2013大兴安岭地区岩石圈地幔的性质及其形成演化过程.博士学位论文.武汉:中国地质大学
祁进平,陈衍景,Pirajno F.2005.东北地区浅成低温热液矿床的地质特征和构造背景.矿物岩石,25(2):47-59
佘宏全,李进文,向安平,关继东,杨郧城,张德全,谭刚,张斌.2012.大兴安岭中北段原岩锆石U-Pb测年及其与区域构造演化关系.岩石学报,28(2):571-594
隋振民,葛文春,吴福元,张吉衡,徐学纯,程瑞玉.2007.大兴安岭东北部侏罗纪花岗质岩石的锆石U-Pb年龄、地球化学特征及成因.岩石学报,23(2):461-480
孙卫东,凌明星,汪方跃,丁兴,胡艳华,周继彬,杨晓勇.2008.太平洋板块俯冲与中国东部中生代地质事件.矿物岩石地球化学通报,27(3):218-225
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