大兴安岭地区扎兰屯变质杂岩的碎屑锆石U-Pb年龄及其大地构造意义
Detrital zircon U-Pb dating of the Zhalantun Metamorphic Complex and its tectonic implications, Great Xing’an, NE China
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摘要: 兴安地块位于额尔古纳和松辽地块之间，长期存在着是稳定陆块和造山带等不同的认识。本文针对兴安地块南部扎兰屯地区出露的原兴华渡口群进行了专项研究，结合前人的研究成果，对该变质杂岩的形成时代、碎屑锆石年龄谱进行了研究，研究成果对该地块的大地构造属性具有重要的制约作用。（1）扎兰屯地区变质杂岩主要为绿片岩-低角闪岩相变质的碎屑岩-火山碎屑岩系，其形成时代晚于481Ma，为早古生代晚期。岩石组合、变质程度与年代学研究表明其与北部的典型兴华渡口群不同，两者不能作为同一地层单元，应该予以解体。（2）扎兰屯变质杂岩碎屑锆石年龄谱主要分为三期：481~580Ma，峰期年龄为529Ma；699~998Ma，峰期年龄为833Ma和1213~3200Ma峰期年龄为2000Ma，分别记录了泛非期Gondwana、新元古Rodinia两期重大地质事件和变质基底的年龄信息。（3）兴安地块以发育兴华渡口群为标志，存在时代为新元古代甚至为太古代的变质结晶基底，因此兴安地块应为一稳定的微陆块，而非夹持于额尔古纳和松辽地块之间的造山带。Abstract: The Xing'an Block is located in the transitional area between the Eerguna and Songliao blocks in the CAOB, with a controversial tectonic affinity of micro-continent vs. orogenic belt. In this paper, we focused on the Zhalantun Metamorphic Complex from the Zhalantun area in the Xing'an Block. The Zhalantun Metamorphic Complex was named 'Xinghuadukou Group' according 1:200000 geological map, which consists of metasandstone, slate, phyllite, mica-schist, meta-acidic volcanics and meta-volcanic tuff. Mica-schist of analyzed sample was collected from south of the Xiangyangyu Reservoir, which consists of quartz (35%~40%), chlorite (20%~25%), muscovite (20%~25%) and feldspar (8%). Sample D09-02A yielded abundant zircon grains, most of which are rounded to subhedral and range from 50 to 180μm in size. CL imaging reveals that most grains are oscillatory zoned and of magmatic origin, although some portions are darker with less distinct zoning. A total of 55 analyses were made on 55 grains. The data show a spread along concordia, with variable discordance. The detrital zircon components show great variation in U and Th contents and Th/U ratios, ranging respectively from 196×10-6~2106×10-6, 75×10-6~2455×10-6 and 0.2~1.8. The 55 zircons from D09-02A yield apparent ages ranging from 2952±32 to 481±12Ma. These results not only give information for the formation ages and detrital zircon age distributions of the Zhailantun Metamorphic Complex in this area, but also show the evidence to confirm the tectonic affinity of the Xing'an Block. (1) The Zhalantun Metamorphic Complex mainly occurs as a sequence of meta-clastic and meta-volcaniclastic rocks and shows greenschist to low-amphibolite facies metamorphism. Its formation age is younger than 481Ma and different from that of the Xinghuadukou Group in the north of the Great Xing'an. (2) Detrital zircon U-Pb dating of the Zhalantun Metamorphic Complex yields three age groups at: 481~580Ma with a peak age of 529Ma, 699~998Ma with a peak age of 833Ma and 1213~2952Ma with a peak age of 2000Ma. These age groups correspond to two key tectonic events of the Gondwana and Rodinia episodes and the Archean basement, respectively. (3) With the revelation of the Neoproterozoic and Archean basement in the Xing'an block, we suggest that the block may belong to a micro-continent but not an orogenic belt.
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Key words:
- Xing’an Block /
- Zhalantun metamorphic Complex /
- Detrital zircon U-Pb dating /
- Tectonic affinity /
- CAOB
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[1] Bureau of Geology and Mineral Resources of Heilongjiang Province. 1993. Regional Geology of Heilongjiang Province. Beijing: Geological Publishing House, 1-734 (in Chinese)
[2] Dong C and Zhou JB. 2012. Geochemistry of ~500Ma Pan-African khondalite series in west of NE China and its tectonic implications. Acta Petrologica Sinica, 28(9): 2866-2878 (in Chinese with English abstract)
[3] Ge WC, Wu FY, Zhou CY and Zhang JH. 2007a. Porphyry Cu-Mo deposits in the eastern Xing’an-Mongolian Orogenic Belt: Mineralization ages and their geodynamic implications. Chinese Science Bulletin, 52: 3416-3427
[4] Ge WC, Sui ZM, Wu FY, Zhang JH, Xu XC and Cheng RY. 2007b. Zircon U-Pb ages, Hf isotopic characteristics and their implications of the Early Paleozoic granites in the northwestern Da Hinggan Mts., northeastern China. Acta Petrologica Sinica 23, 423-440 (in Chinese with English abstract)
[5] Hu ZC, Gao S, Liu YS, Hu SH, Chen HH and Yuan HL. 2008. Signal enhancement in laser ablation ICP-MS by addition of nitrogen in the central channel gas. Journal of Analytical Atomic Spectrometry, 23: 1093-1101
[6] Huang JQ and Jiang CF. 1962. Preliminary investigation on the evolution of the earth’s crust from the point of view of polycyclic tectonic movements. Acta Geologica Sinica, 42(2): 105-151 (in Chinese with English abstract)
[7] Li CY. 1980. The plate tectonic outline of China. Journal of China Academy of Geological Sciences, 2(1): 11-20 (in Chinese)
[8] Li CY and Tang YQ. 1983. Some problems on subdivsion of palaeo-plates in Asia. Acta Geologica Sinica, 57(1): 1-10 (in Chinese with English abstract)
[9] Li JY. 2006. Permian geodynamic setting of Northeast China and adjacent regions: Closure of the Paleo-Asian Ocean and subduction of the Paleo-Pacific Plate. Journal of Asian Earth Sciences, 26(3): 207-224
[10] Li JY, Gao LM, Sun GH, Li YP and Wang YB. 2007. 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. Acta Petrologica Sinica, 23(3): 565-582 (in Chinese with English abstract)
[11] Liu YS, Gao S, Hu ZC, Gao CG, Zong KQ and Wang DB. 2010. 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 of mantle xenoliths. Journal of Petrology, 51: 537-571
[12] Ludwig KR. 2003. ISOPLOT 3.00: A Geochronological Toolkit for Microsoft Excel. Berkeley: Berkeley Geochronology Center, California
[13] Miao LC, Fan WM, Zhang FQ, Liu DY, Jian P, Shi GH, Tao H and Shi YR. 2003. SHRIMP zircon geochronology and its implications on the Xinkailing-Keluo complex, northwestern of Lesser Xing’an Range. Chinese Science Bulletin, 48(22): 2315-2323(in Chinese)
[14] Miao LC, Liu DY, Zhang FQ, Fan WM, Shi YR and Xie HQ. 2007. Zircon SHRIMP U-Pb ages of the "Xinghuadukou Group" in Hanjiayuanzi and Xinlin areas and the "Zhanlantun Group" in Inner Mongolia, Great Xing’an Range. Chinese Science Bulletin, 52(5): 591-601 (in Chinese)
[15] Ren JS, Niu BG and Liu ZG. 1999. Soft collision, superposition orogeny and polycyclic suturing. Earth Science Frontiers, 6(3): 85-93 (in Chinese with English abstract)
[16] Sengör AMC, Natal’in BA and Burtman VS. 1993. Evolution of the Altaid tectonic collage and Palaeozoic crustal growth in Eurasia. Nature, 364(6435): 299-307
[17] Sun LX, Ren BF, Zhao FQ, Ji SP and Geng JZ. 2013. Late Paleoproterozoic magmatic records in the Eerguna massif: Evidences from the zircon U-Pb dating of granitic gneisses. Geological Bulletin of China, 32(2-3): 341-352 (in Chinese with English abstract)
[18] Tang KD. 1990. Tectonic development of Palaeozoic fold belts at the north margin of the Sino-Korean craton. Tectonics, 9(2): 249-260
[19] Wiedenbeck M, Alle P, Corfu F, Griffin WL, Meier M, Oberli F, Quadt AV, Roddick JC and Spiegel W. 1995. Three natural zircon standards for U-Th-Pb, Lu-Hf, trace element and REE analyses. Geostandards and Geoanalytical Research, 19: 1-23
[20] Wilde SA, Zhang XZ and Wu FY. 2000. Extension of a newly-identified 500Ma metamorphic terrain in Northeast China: Further U-Pb SHRIMP dating of the Mashan Complex, Heilongjiang Province, China. Tectonophysics, 328(1-2): 115-30
[21] Wilde SA, Wu FY and Zhang XZ. 2003. Late Pan-African magmatism in northeastern China: SHRIMP U-Pb zircon evidence for igneous ages from the Mashan Complex. Precambrian Research, 122(1-4): 311-27
[22] Wu FY, Sun DY, Ge WC, Zhang YB, Grant ML, Wilde SA and Jahn BM. 2011. Geochronology of the Phanerozoic granitoids in northeastern China. Journal of Asian Earth Sciences, 41(1): 1-30
[23] Wu G, Sun FY, Zhao CS, Li ZT, Zhao AL, Pang QB and Li GY. 2005. Discovery of the Early Paleozoic post-collisional granites in northern margin of the Erguna massif and its geological significance. Chinese Science Bulletin, 50(23): 2733-2743
[24] Wu G, Chen YC, Chen YJ and Zeng QT. 2012. Zircon U-Pb ages of the metamorphic supracrustal rocks of the Xinghuadukou Group and granitic complexes in the Argun massif of the northern Great Hinggan Range, NE China, and their tectonic implications. Journal of Asian Earth Sciences, 49: 214-233
[25] Yang XL. 2007. Geological characteristics and study of detrital zircon geochronology of epimetamorphic rock serise in Zhalantun area. Master Degree Thesis. Changchun: Jilin University (in Chinese)
[26] Zhou JB, Wilde SA, Zhang XZ, Zhao GC, Zheng CQ, Wang YJ and Zhang XH. 2009. The onset of Pacific margin accretion in NE China: Evidence from the Heilongjiang high-pressure metamorphic belt. Tectonophysics, 478(3-4): 230-246
[27] Zhou JB, Wilde SA, Zhao GC, Zhang XZ, Wang H and Zeng WS. 2010a. Was the easternmost segment of the Central Asian Orogenic Belt derived from Gondwana or Siberia: An intriguing dilemma? Journal of Geodynamics, 50(3-4): 300-317
[28] Zhou JB, Wilde SA, Zhao GC, Zhang XZ, Zheng CQ, Wang H and Zeng WS. 2010b. Pan-African metamorphic and magmatic rocks of the Khanka Massif, NE China: Further evidence regarding their affinity. Geological Magazine, 147(5): 737-749
[29] Zhou JB, Wilde SA, Zhang XZ, Zhao GC, Liu FL. Qiao DW, Ren SM and Liu JH. 2011a. A>1300km Late Pan-African metamorphic belt in NE China: New evidence from the Xing’an block and its tectonic implications. Tectonophysics, 509(3-4): 280-292
[30] Zhou JB, Wilde SA, Zhang XZ, Ren SM and Zheng CQ. 2011b. Early Paleozoic metamorphic rocks of the Erguna block in the Great Xing’an Range, NE China: Evidence for the timing of magmatic and metamorphic events and their tectonic implications. Tectonophysics, 499(1-4): 105-117
[31] Zhou JB, Wilde SA, Zhang XZ, Liu FL and Liu JH. 2012. Detrital zircons from phanerozoic rocks of the Songliao Block, NE China: Evidence and tectonic implications. Journal of Asian Earth Sciences, 47: 21-34
[32] Zhou JB and Wilde SA. 2013. The crustal accretion history and tectonic evolution of the NE China segment of the Central Asian Orogenic Belt. Gondwana Research, 23: 1365-1377
[33] 董策, 周建波. 2012. 中国东北地区西部~500Ma泛非期孔兹岩系地球化学特征及其地质意义. 岩石学报, 28(9): 2866-2878
[34] 葛文春, 吴福元, 周长勇, 张吉衡. 2007a. 兴蒙造山带东端斑岩型Cu, Mo矿床成矿时代及其地球动力学意义. 科学通报, 52(20): 2407-2417
[35] 葛文春, 隋振民, 吴福元, 张吉衡, 徐学纯, 程瑞玉. 2007b. 大兴安岭东北部早古生代花岗岩锆石U-Pb年龄、Hf同位素特征及地质意义. 岩石学报, 23(2): 423-440
[36] 黑龙江省地质矿产局.1993.黑龙江省区域地质志.北京: 地质出版社, 1-734
[37] 黄汲清, 姜春发. 1962. 从多旋回构造运动观点初步探讨地壳发展规律. 地质学报, 42(2): 105-152
[38] 李春昱. 1980.中国板块构造的轮廓.中国地质科学院报, 2(1): 11-20
[39] 李春昱, 汤耀庆. 1983. 亚洲古板块划分以及有关问题. 地质学报, 57(1): 1-10
[40] 李锦轶, 高立明, 孙桂华, 李亚萍, 王彦斌. 2007. 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. 岩石学报, 23(3): 565-582
[41] 苗来成, 范蔚茗, 张福勤, 刘敦一, 简平, 施光海, 陶华, 石玉若. 2003. 小兴安岭西北部新开岭-科洛杂岩锆石SHRIMP年代学研究及其意义. 科学通报, 48(22): 2315-2323
[42] 苗来成, 刘敦一, 张福勤, 范蔚茗, 石玉若, 颉颃强. 2007. 大兴安岭韩家园子和新林地区兴华渡口群和扎兰屯群锆石SHRIMP U-Pb年龄. 科学通报, 52(5): 591-601
[43] 任纪舜, 牛宝贵, 刘志刚. 1999. 软碰撞、叠覆造山和多旋回缝合作用. 地学前缘, 6(3): 85-93
[44] 孙立新, 任邦方, 赵凤清, 冀世平, 耿建珍. 2013. 内蒙古额尔古纳地块古元古代末期的岩浆记录——来自花岗片麻岩的锆石U-Pb年龄证据. 地质通报, 32(2-3): 341-352
[45] 武广, 孙丰月, 赵财胜, 李之彤, 赵爱琳, 庞庆帮, 李广远. 2005. 额尔古纳地块北缘早古生代后碰撞花岗岩的发现及其地质意义. 科学通报, 50(20): 2278-2288
[46] 杨现力. 2007. 扎兰屯浅变质岩系地质特征及其碎屑锆石年代学研究. 硕士学位论文. 长春: 吉林大学
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