额尔古纳地块八卡地区岩浆作用及其构造意义
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摘要
通过对额尔古纳八卡地区酸性侵入岩进行LA-ICP-MS锆石U-Pb定年研究表明,八卡区内5个代表性的酸性侵入岩体中的锆石大部分为自形-半自形晶,显示其为岩浆成因锆石;岩浆作用集中于3个阶段。其包括:1)新元古代早期岩浆活动,正长花岗岩加权平均年龄为798 Ma±6Ma,其形成可能与Rodinia超大陆裂解的构造背景有关;2)晚二叠世—早三叠世的岩浆活动,岩石年龄介于238～267Ma,结合花岗岩特征,反映其形成于古亚洲洋闭合后的造山后环境;3)花岗岩的138Ma±1Ma、137Ma±2Ma岩体年龄显示了早白垩世岩浆作用的存在,该岩浆事件与蒙古-鄂霍茨克缝合带的演化有关。
Zircons from the 5 representative acidic intrusive bodies in Baka area are generally idiomorphic or hypidiomorphic crystals from magma.Data of LA-ICP-MS zircon U-Pb dating of the acidic intrusive rocks are concentrated in 3 stages.The first stage is early Neoproterozoic orthoclase granite with the weighted average age of 798 Ma±6 Ma which is related to the geological event of disintegration of Rodinia supercontinent.The second stage is 242 to 265 Ma,the late Permian-Early Triassic period and the magmatism took place under the post-orogenic environment after the closure of the Paleo-Asian oceanaccording to characteristics of the granite.The third stage is is 138 Ma±1 Ma and 137 Ma±2 Ma corresponding to early Cretaceous Epoch related to the evolution of the Mongolian-Okhotsk suture zone.
Zircons from the 5 representative acidic intrusive bodies in Baka area are generally idiomorphic or hypidiomorphic crystals from magma.Data of LA-ICP-MS zircon U-Pb dating of the acidic intrusive rocks are concentrated in 3 stages.The first stage is early Neoproterozoic orthoclase granite with the weighted average age of 798 Ma±6 Ma which is related to the geological event of disintegration of Rodinia supercontinent.The second stage is 242 to 265 Ma,the late Permian-Early Triassic period and the magmatism took place under the post-orogenic environment after the closure of the Paleo-Asian oceanaccording to characteristics of the granite.The third stage is is 138 Ma±1 Ma and 137 Ma±2 Ma corresponding to early Cretaceous Epoch related to the evolution of the Mongolian-Okhotsk suture zone.
引文
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[8]许文良，王枫，裴福萍，等．中国东北中生代构造体制与区域成矿背景：来自中生代火山岩组合时空变化的制约[J]．岩石学报，2013,29(2):340-345．
[9]Tang J,Xu W L,Wang F,Wang W,Xu M J,Zhang Y H.Geochronology and geochemistry of Neoproterozoic magmatismin the Erguna Massif,NE China:Petrogenesis and implications forthe breakup of the Rodinia supercontinent[J].Precambrian Res,2013,224:597-611．
[10]Tang J,Xu W L,Wang F,Wang W,Xu M J,Zhang Y H.Geochronology and geochemistry of Early-Middle Triassic magma-tism in the Erguna Massif,NE China:Constraints on the tectonicevolution of the Mongol-Okhotsk Ocean[J].Lithos,2014,184-187:1-16．
[11]Tang J,Xu W L,Wang F,Zhao S,Li Y.Geochronology,geochem-istry and deformation history of Late Jurassic-Early Cretaceous in-trusive rocks in the Erguna Massif,NE China:Constraints on the lateMesozoic tectonic evolution of the Mongol-Okhotsk orogenic belt[J].Tectonophysics,2015,658:91-110．
[12]Zhao S,Xu W L,Wang W,Tang J,Zhang Y H.Geochronologyand geochemistry of Middle-Late Ordovician granites and gabbros inthe Erguna region,NE China:Implications for the tectonic evolutionof the Erguna Massif[J].Earth SciChina,2014,25:841-853．
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[14]张丽，刘永江，李伟民．关于额尔古纳地块基底性质和东界的讨论[J]．地质科学，2013,48(1):227-244．
[15]内蒙古自治区地质矿产局．内蒙古自治区岩石地层[M]．武汉：中国地质大学出版社，1996:1-342．
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[22]孙立新，任邦方，赵凤清，等．额尔古纳地块太平川巨斑状花岗岩的锆石U-Pb年龄和Hf同位素特征[J]．地学前缘，2012,19(5):114-122．
[23]徐备．Rodinia超大陆构造演化研究的新进展和主要目标[J]．地质科技情报，2001,20(1):15-19．
[24]Lu S N,Li H K,Zhang C L,et al.Geological and Geochronological Evidence for the Precambrian Evolution of the Tarim Craton and Surrounding Continental Fragments[J].Precambrian Research,2008,160(1-2):94-107．
[25]Xia L Q,Xia Z C,Xu X Y,et al.Mid-Late Neoprotero-zoic Rift-Related Volcanic Rocks in China:Geological Re-cords of Rifting and Break-Up of Rodinia[J].Geoscience Fron-tiers,2012,3(4):375-399．
[26]王伟，许文良，王枫，等．满洲里-额尔古纳地区中生代花岗岩的锆石U-Pb年代学与岩石组合：对区域构造演化的制约[J]．高校地质学报，2012,18(1):88-105．
[27]赵硕，许文良，唐杰，等．额尔古纳地块新元古代岩浆作用与微陆块构造属性：来自侵入岩锆石U-Pb年代学、地球化学和Hf同位素的制约[J]．地球科学，2016,41(11):1804-1822．
[28]Ernst R E,Buchan K L.Mantle Plume Events during the Assembly and Breakup of Rodinia:The Record form ShortDuration Large Igneous Province[J].Abstracts with Programs-Geological Society of America,1999,31(7):316．
[29]Li Z X,Bogdanova S V,Collins A S,et al.Assem-bly,Configuration,and Break-Up History of Rodinia:A Synthesis[J].Precambrian Research1,2008,60(1-2):179-210．
[30]Zhang Y H,Xu W L,Tang J,Wang F,Xu M J,Wang W.Age and provenance of the Ergunahe Group and the Wubinaobao Formation,northeastern Inner Mongolia,NE China:Implications for tectonic settingof the Erguna Massif[J].International Geology Review,2014,56:653-671．
[31]Li J Y.Permian geodynamic setting of Northeast China and adjacent regions:closure of the Paleo-Asian Ocean and subbduction of the Paleo-Pacific Plate[J].Journal of Asian Earth Sciences,2006,26(3-4):207-224．
[32]李益龙，周汉文，肖文交，等．古亚洲构造域和西太平洋构造域在索伦缝合带东段的叠加[J]．地球科学-中国地质大学学报，2012,37(3):434-449．
[33]Sorokin A A,Kudryashov N M,Sorokin A P.Fragments of Paleozoic active margins at the souther nperiphery of the Mongolia-Okhotsk foldbelt:evidence from the northeastern Argun terrane,Amur river region[J].Doklady Earth Sciences,2002,387A:1038-1042．
[34]张永清，韩建刚，胡凤翔．内蒙古阿拉善盟巴音诺日公地区中三叠世花岗岩特征及构造意义[J]．内蒙古地质，2002(4):15-20．
[35]张炯飞，朱群，邵军，等．内蒙古八道卡石英闪长岩单颗粒锆石U-Pb年龄及其地质意义[J]．吉林大学学报（地球科学版），2003,33(4):43-433．
[36]李锦轶．新疆东部新元古代晚期和古生代构造格局及其演变[J]．地质论评，2004,50(3):304-322．
[37]吕志成，段国正，刘丛强，等，满洲里-额尔古纳地区岩浆作用及其大地构造意义[J]．矿物岩石，2001,21(1):78-85．
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