Abstract：Petrology, geochronology and geochemistry of Luohe pluton in the connecting areas between Great Xinganling and Lesser Khingan Mountains were studied to intensify the knowledge of the tectonic evolution in the middle part of Xingmeng orogenic belt and discuss the Jurassic tectonomagmatic evolution in Duobaoshan area. The results show that Luohe pluton is mainly composed of medium fine-grained granodiorite and fine-grained granodiorite, with a small amount of granodiorite porphyry developed in the middle of the pluton. The zircon U-Pb ages of the granodiorite is (168.09 ± 0.95) Ma, indicating that it is emplaced during the Middle Jurassic. The granodiorite is characterized by high Na, high K, low Ti and low P in major elements, and low Sr and high Yb in trace elements, with depleted HREE. And weakly negative Eu anomaly is in REE distribution, which makes the granodiorite belonging to the high-K calcium alkaline series I-type granite. The Triassic and Early Jurassic sedimentary in the study area and Great Hinggan Mountains were deficient according to the discrimination diagram of tectonic setting, which means that the granodiorite of Luohe pluton belongs to the post-collision granite. Combined with the characteristics of the early-middle Jurassic intrusive rocks around the study area, the Luohe pluton is considered to be formed in the post collisional tectonic environment after the closure of Mongolia Okhotsk ocean.
[1] 孙德有,吴福元,张艳斌,等.西拉木伦河—长春—延吉板块缝合带的最后闭合时间——来自吉林大玉山花岗岩体的证据[J].吉林大学学报:地球科学版,2004,34(2):174-181. Sun D Y,Wu F Y,Zhang Y B,et al.The final closing time of the west Lamulun River-Changchun-Yanji plate suture zone——evidence from the Dayushan granitic pluton,Jilin Province[J].J Jilin Univ:Earth Sci Ed,2004,34(2):174-181. [2] 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古板块碰撞时限的约束[J].岩石学报,2007,23(3):565-582. Li J Y,Gao L M,Sun G H,et al.Shuangjingzi middle Triassic syn-collisional crust-derived granite in the east Inner Mongolia and its constraint on the timing of collision between Siberian and Sino-Korean paleo-plates[J].Acta Petrol Sin,2007,23(3):565-582. [3] Cao H H,Xu W L,Pei F P,et al.Zircon U-Pb geochronology and petrogenesis of the Late Paleozoic-Early Mesozoic intrusive rocks in the eastern segment of the northern margin of the North China Block[J].Lithos,2013,170-171:191-207. [4] 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):339-353. Xu W L,Wang F,Pei F P,et al.Mesozoic tectonic regimes and regional ore-forming background in NE China:Constraints from spatial and temporal variations of Mesozoic volcanic rock associations[J].Acta Petrol Sin,2013,29(2):339-353. [5] 孟凡超,刘嘉麒,崔岩,等.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[J].岩石学报,2014,30(12):3569-3586. Meng F C,Liu J Q,Cui Y,et al.Mesozoic tectonic regimes transition in the Northeast China:Constriants from temporal-spatial distribution and associations of volcanic rocks[J].Acta Petrol Sin,2014,30(12):3569-3586. [6] Wu F Y,Sun D Y,Ge W C,et al.Geochronology of the Phane-rozoic granitoids in northeastern China[J].J Asian Earth Sci,2011,41(1):1-30. [7] 隋振民,葛文春,吴福元,等.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[J].岩石学报,2007,23(2):461-480. Sui Z M,Ge W C,Wu F Y,et al.Zircon U-Pb ages,geochemistry and its petrogenesis of Jurassic granites in northeastern part of the Da Hinggan-Mts[J].Acta Petrol Sin,2007,23(2):461-480. [8] 邵济安,张履桥,牟保磊.大兴安岭中生代伸展造山过程中的岩浆作用[J].地学前缘,1999,6(4):339-346. Shao J A,Zhang L Q,Mu B L.Magmatism in the mesozoic extending orogenic process of Da Hinggan MTS[J].Earth Sci Front,1999,6(4):339-346. [9] 林强,葛文春,吴福元,等.大兴安岭中生代花岗岩类的地球化学[J].岩石学报,2004,20(3):403-412. Lin Q,Ge W C,Wu F Y,et al.Geochemistry of Mesozoic granites in Da Hinggan Ling ranges[J].Acta Petrol Sin,2004,20(3):403-412. [10] 李仰春,张克信,吴淦国,等.大一小兴安岭接合部早—中侏罗世侵入岩SHRIMP锆石U-Pb定年及成因[J].地质通报,2013,32(5):717-729. Li Y C,Zhang K X,Wu G G,et al.Zircon U-Pb ages and causes of the Early-Middle Jurassic granites in the Da-Xiao Xinganling Copula[J].Geological Bulletin of China,2013,32(5):717-729. [11] 刘翠,邓晋福,许立权,等.大兴安岭—小兴安岭地区中生代岩浆-构造-钼成矿地质事件序列的初步框架[J].地学前缘,2011,18(3):166-178. Liu C,Deng J F,Xu L Q,et al.A preliminary frame of magma-tectonic-Mo metallogenic events of Mesozoic Era in Da Hinggan Mountains and Xiao Hinggan Mountains areas[J].Earth Sci Front,2011,18(3):166-178. [12] 徐文喜,李成禄.大兴安岭东北部霍龙门地区中侏罗世花岗岩-锆石U-Pb年龄、地球化学特征及构造意义[J].地质与资源,2018,27(6):522-530. Xu W X,Li C L.Middle Jurassic granites in Huolongmen area,Northeastern Daxinganling Mountains:Zircon U-Pb Age,geochemistry and tectonic implications[J].Geol Res,2018,27(6):522-530. [13] 尹志刚,李敏,李文龙,等.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[J].矿物岩石地球化学通报,2019,38(1):69-79. Yin Z G,Li M,Li W L,et al.The origin and tectonic environment of the early Jurassic Adakitic Granodiorite in the Dajinshan area of the Central and Northern Da Hinggan Range[J].Bull Mineral Petrol Geochem,2019,38(1):69-79. [14] 佘宏全,李进文,向安平,等.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[J].岩石学报,2012,28(2):571-594. She H Q,Li J W,Xiang A P,et al.U-Pb ages of the zircons from primary rocks in middle-northern Daxinganling and its implications to geotectonic evolution[J].Acta Petrol Sin,2012,28(2):571-594. [15] 施璐,郑常青,唐振,等.大兴安岭中部早中侏罗世花岗岩成因及构造背景[J].地质论评,2017,63(S1):309-310. Shi L,Zheng C Q,Tang Z,et al.Genesis and tectonic significance of the early-middle Jurassic Granitoids in the central great Xing'an Range[J].Geol Rev,2017,63(S1):309-310. [16] 褚少雄,刘建明,徐九华,等.黑龙江三矿沟铁铜矿床花岗闪长岩锆石U-Pb定年、岩石成因及构造意义[J].岩石学报,2012,28(2):433-450. Chu S X,Liu J M,Xu J H,et al.Zircon U-Pb dating,petrogenesis and tectonic significance of the granodiorite in the Sankuanggou skarn Fe-Cu deposit,Heilongjiang Province[J].Acta Petrol Sin,2012,28(2):433-450. [17] Deng K,Li Q G, Chen Y J,et al.Geochronology,geochemistry and Sr-Nd-Pb-Hf isotopes of the Early Jurassic granodiorite from the Sankuanggou intrusion,Heilongjiang Province,Northeastern China:Petrogenesis and geodynamic implications[J].Lithos,2018,296-299:113-128. [18] Chu S X,Zeng Q D,Liu J M,et al.Early-Middle Jurassic magmatism and skarn-porphyry mineralization in NE China:Geochronological and geochemical constraints from the Sankuanggou skarn Fe-Cu-(Mo) deposit,and tectonic implications[J].J Geochem Explor,2019,200:84-103. [19] 杨贺,马万里,蔡文艳,等.黑龙江小多宝山矽卡岩型Fe-Cu矿床成矿时代及构造背景——来自岩石地球化学、锆石年代学及Hf同位素证据[J].岩石学报,2020,36(3):856-870. Yang H,Ma W L,Cai W Y,et al.Metallogenic epoch and tectonic setting of the Xiaoduobaoshan Fe-Cu deposit in Heilongjiang Province,China:Evidence from petrogeochemistry,zircon U-Pb geochronology and Hf isotopic compositions[J].Acta Petrol Sin,2020,36(3):856-870. [20] 黑龙江省地质局第一区调队.多宝山铜矿幅、工人村幅(部分)1∶5万区域地质调查报告[R].1981. The First Regional Geological Survey Team of Heilongjiang Geological Bureau.1∶50 000 Regional Geological Survey Report of Duobaoshan Copper Ore Sheet and Gongrencun Sheet (part)[R].1981. [21] 潘桂棠,肖庆辉,陆松年等.中国大地构造单元划分[J].中国地质,2009,36(01):1-28. Pan G T, Xiao Q H, Lu S N, et al.Subdivision of tectonic units in China[J].Geology in China, 2009,36(01):1-28. [22] 符安宗,杨文鹏,刘渊,等.大兴安岭中段碾子山地区晚三叠世埃达克质侵入岩的发现及其地质意义[J].现代地质,2022,36(01):266-281. Fu A Z, Yang W P, Liu Y, et al.Discovery of Late Triassic Adakitic Rocks at Nianzishan in the Central Great Xing'an Range and Its Geological Significance[J].Geoscience,2022,36(01):266-281. [23] 赵焕利,刘旭光,刘海洋,等.黑龙江多宝山古生代海盆闭合的岩石学证据[J].世界地质,2011,30(1):18-27. Zhao H L,Liu X G,Liu H Y,et al.Petrological evidence of Paleozoic marine basin closure in Duobaoshan of Heilongjiang[J].Glob Geol,2011,30(1):18-27. [24] Jackson S E,Pearson N J,Griffin W L,et al.The application of laser ablation-inductively coupled plasma-mass spectrometry to in situ U-Pb zircon geochronology[J].Chem Geol,2004,211(1/2):47-69. [25] Liu Y S,Hu Z C,Zong K Q,et al.Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LA-ICP-MS[J].Chin Sci Bull,2010,55(15):1535-1546. [26] Ludwig K R.ISOPLOT 3.0:A Geochronological Toolkit for Microsoft Excel[M].Berkeley:Berkeley Geochronology Center Special Publication,2003. [27] Liang Q,Jing H,Gregoire D C.Determination of trace elements in granites by inductively coupled plasma mass spectrometry[J].Talanta,2000,51(3):507-513. [28] Hoskin P W O,Black L P.Metamorphic zircon formation by solid-state recrystallization of protolith igneous zircon[J].J Metamorph Geol,2000,18(4):423-439. [29] Maniar P D,Piccoli P M.Tectonic discrimination of grani-toids[J].GSA Bull,1989,101(5):635-643. [30] Peccerillo A,Taylor S R.Geochemistry of eocene calc-alkaline volcanic rocks from the Kastamonu area,Northern Turkey[J].Contrib Mineral Petrol,1976,58(1):63-81. [31] Sun S S,McDonough W F.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and proce-sses[J].Geo Soc London Special Pub,1989,42(1):313-345. [32] 马鸿文. 花岗岩成因类型的判别分析[J].岩石学报,1992,8(4):341-350. Ma H W.Discrimination of genetic types of granitoid rocks[J].Acta Petrol Sin,1992,8(4):341-350. [33] Chappell B W.Aluminium saturation in I- and S-type granites and the characterization of fractionated haplogranites[J].Lithos,1999,46(3):535-551. [34] Tischendorf G,Paelchen W.Zur Klassifikation von Granitoid-en[J].Z Geol Wiss,1985,13(5):615-627. [35] McDonough W F,Sun S S.The composition of the Earth[J].Chem Geol,1995,120(3/4):223-253. [36] Taylor S R,McLennan S M.The Continental Crust: Its Composition and Evolution,An Examination of the Geochemical Record Preserved in Sedimentary Rocks[M].Carlton:Blackwell Scientific Publication,1985. [37] Chappell B W,White A J R.I- and S-type granites in the Lachlan Fold Belt[J].Earth Environ Sci Trans Roy Soc Edinburgh,1992,83(1/2):1-26. [38] White R V,Tarney J,Kerr A C,et al.Modification of an oceanic plateau,Aruba,Dutch Caribbean:Implications for the generation of continental crust[J].Lithos,1999,46(1):43-68. [39] Wiebe R A,Jellinek M,Markley M J,et al.Steep schlieren and associated enclaves in the Vinalhaven granite,Maine:possible indicators for granite rheology[J].Contrib Mineral Petrol,2007,153(2):121-138. [40] Barbarin B.Mafic magmatic enclaves and mafic rocks associated with some granitoids of the central Sierra Nevada batholith,California:nature,origin,and relations with the hosts[J].Lithos,2005,80(2/3):155-177. [41] 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 Mineral Petrol,1982,80(2):189-200. [42] Batchelor R A,Bowden P.Petrogenetic interpretation of granitoid rock series using multicationic parameters[J].Chem Geol,1985,48(2/3):43-55. [43] Pearce J A,Harris N B W,Tindle A G.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J].J Petrol,1984,25(4):956-983. [44] Pearce J.Sources and settings of granitic rocks[J].Episodes,1996,19(4):120-125. [45] 张旗,王元龙,金惟俊,等.造山前、造山和造山后花岗岩的识别[J].地质通报,2008,27(1):1-18. Zhang Q,Wang Y L,Jin W J,et al.Criteria for the recognition of pre-,syn-and post-orogenic granitic rocks[J].Geol Bull China,2008,27(1):1-18. [46] 韩宝福. 后碰撞花岗岩类的多样性及其构造环境判别的复杂性[J].地学前缘,2007,14(3):64-72. Han B F.Diverse post-collisional granitoids and their tectonic setting discrimination[J].Earth Sci Front,2007,14(3):64-72. [47] 肖庆辉,邓晋福,马大铨,等.花岗岩研究思维与方法[M].北京:地质出版社,2002. Xiao Q H,Deng J F,Ma D Q,et al.The Ways of Investigation on Granitoids[M].Beijing:Geological Publishing House,2002. [48] 黑龙江省地质矿产局.黑龙江省区域地质志[M].北京:地质出版社,1993. Bureau of Geology and Mineral Resources of Heilongjiang Pro-vince.Regional Geology of Heilongjiang Province[M].Beijing:Geological Publishing House,1993. [49] 内蒙古自治区地质矿产局.内蒙古自治区区域地质志[M].北京:地质出版社,1993. Bureau of Geology and Mineral Resources of Nei Mongol (Inner Mongolia) Autonomous Region.Regional Geology of Nei Mongol (Inner Mongolia) Autonomous Region[M].Beijing:Geological Publishing House,1993. [50] 李宇,丁磊磊,许文良,等.孙吴地区中侏罗世白云母花岗岩的年代学与地球化学:对蒙古——鄂霍茨克洋闭合时间的限定[J].岩石学报,2015,31(1):56-66. Li Y,Ding L L,Xu W L,et al.Geochronology and geochemistry of muscovite granite in Sunwu area,NE China:Implications for the timing of closure of the Mongol-Okhotsk Ocean[J].Acta Petrol Sin,2015,31(1):56-66.
2023, Vol. 10 
