Redefinition of jiehekou group in Yunzhongshan area, Shanxi Province
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摘要: 云中山位于五台地区和吕梁地区的过渡部位，对研究五台杂岩和吕梁杂岩的构造关系具有重要的地质意义。云中山地区变质基底由一套石英岩、黑云变粒岩、大理岩和斜长角闪岩等变质表壳岩和新太古代花岗片麻岩组成，前人将这套变质表壳岩建造称为“界河口群”，但是从野外观察来看，这套变质建造的岩石组合与吕梁山区界河口群有很大的差异，应重新厘定。本次工作在野外调查的基础上，根据岩石组合的不同，将云中山变质表壳岩划分为两部分：Ar3Y（Y代表云中山变质表壳岩）呈残留体保存在新太古代花岗片麻岩中，主要岩石类型包括：黑云变粒岩、石英岩、角闪变粒岩、斜长角闪岩等，其中花岗片麻岩的年代学研究表明该区界河口群的形成年龄老于～2.5 Ga；Pt1qz（qz代表石英岩建造）与新太古代花岗片麻岩呈韧性剪切构造接触，部分建造被古元古代晚期侵入体分隔，主要岩石组合为一套石英岩、磁铁变粒岩、大理岩、斜长角闪岩组合，年代学研究显示，这套岩石的沉积时限应在1.94～2.14 Ga。对两套岩石中变质火山岩的地球化学研究表明，Pt1qz形成于伸展背景下，有可能是被动大陆边缘的构造环境的产物，Ar3Y则形成于俯冲消减的岛弧构造背景下。Abstract: Yunzhongshan lies between Wutai area and Lvliang area, which plays an important role in studying tectonic relationship between Wutai complex and Lvliang complex.The metamorphic basement in Yunzhongshan is mainly composed of Neoarchaean granitic gneisses and a suit of metamorphosed supracrustal rocks which was called“Jiehekou Group”consisting of quartzite, Bi-leptynite, marble and amphibolite.However, according to field investigation, there are many differences between these metamorphosed supracrustal rocks and the typical Jiehekou Group in Lvliang area.Based on the rock association in this field investigation, these metamorphosed supracrustal rocks are divided into two parts.Ar3Y (Y represents Yunzhongshan metamorphosed supracrustal rocks)resided in the Neoarchaean granitic gneisses contains Bi-leptynite, quartzite, Hb-leptynite, amphibolite and so on.Chronological study of the granitic gneisses shows that the forming age of Ar3Y is older than ~2.5 Ga; Pt1qz(qz represents quartzite)has a ductile shearing contact with the Neoarchaean granitic gneisses, part of which is intruded by late Paleoproterozoic intrusions aging of ~1.94 Ga.Pt1qz consists largely of quartzite, magnetite leptynite, marble and amphibolite.The research of geochronology implies the formation age of Pt1qz is 1.94~2.14Ga.The geochemistry of the metavolcanics rocks in two suits of metamorphosed supracrustal rocks respectively suggest that Pt1qz was formed in the background of spreading tectonics with the products of passive continental margin and Ar3Y was developed in an island arc environment of subduction zone.
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Key words:
- Yunzhongshan area /
- primary Jiehekou group /
- disintergration /
- geochronology /
- tectonic setting
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[1] 康健丽,王惠初,肖志斌,等.华北克拉通新太古代地壳增生:来自山西云中山地区TTG 片麻岩和二长花岗片麻岩的证据[J].岩石学报,2017,(09):2881-2898.
[2] 王惠初,康健丽,肖志斌,等.华北克拉通新太古代板块俯冲作用:来自山西云中山地区变质高镁火成岩组合的证据[J].岩石学报,2018,33(9):1099-1118.
[3] 白瑾.五台山早前寒武纪地质[M].天津:天津科技出版社,1986.
[4] 白瑾,黄学光,王惠初,等.中国前寒武纪地壳演化(第二版)[M].北京:地质出版社,1996.
[5] YU J H, WANG D Z, WANG X Y, et al.Ages of Lüliang Group and its metamorphism in Mt.Lüliang Region, Shanxi Province: evidence from single grain zircon U-Pb dating[J].Chinese Journal of Geochemistry.1997, 16:170-177.
[6] 于津海,王德滋,王赐银,等.山西吕梁山中段元古代花岗质岩浆活动和变质作用[J].高校地质学报,2004,10(4):500-513.
[7] 耿元生,杨崇辉,宋彪,等.吕梁地区18 亿年的后造山花岗岩:同位素年代和地球化学制约[J].高校地质学报,2004,10(4):477-487.
[8] 耿元生,杨崇辉,万渝生.吕梁地区古元古代花岗岩浆作用-来自同位素年代学的证据[J].岩石学报,2006,22(2):305-314.
[9] 万渝生,耿元生,沈其韩,等.孔兹岩系-山西吕梁地区界河口群的年代学和地球化学[J].岩石学报,2000,16(1):49-58.
[10] 刘建忠,张福勤,欧阳自远,等.山西吕梁山界河口群变质基性火山岩的地球化学及年代学研究[J].中国科学(D辑),2001,31(2):111-118.
[11] 翟明国.华北克拉通2.1-1.7 Ga 地质事件群的分解和构造意义探讨[J].岩石学报,2004,20(6):1341-1354.
[12] 翟明国,彭澎.华北克拉通古元古代构造事件[J].岩石学报,2007,23(11):2665-2682.
[13] ZHAO G C, SIMON A WILDE, SUN M, et al.SHRIMP UPb zircon ages of granitoid rocks in the Lüliang Complex:Implications for the accretion and evolution of the Trans-North China Orogen [J].Precambrian Research.2008, 160:213-226.
[14] ZHAO G C, YIN C Q, GUO J H, et al.Metamorphism of the Lüliang amphibolite: implications for the tectonic evolution of the North China Craton[J].American Journal of Science.2010, 310:1480-1502.
[15] WANG Z H, WILDE S A, WANG K Y, et al.A MORBarc basalt-adakite association in the 2.5 Ga Wutai greenstone belt: Late Archean magmatism and crustal growth in the North China Craton [J].Precambrian Research.2004, 131:323-343.
[16] WILDE S A, ZHAO G C, WANG K Y, et al.First SHRIMP zircon U-Pb ages for Hutuo Group in Wutaishan:further evidence for Palaeoproterozoic amalgamation of North China Craton[J].Chinese Science Bulletin.2004, 49:83-90.
[17] WILDE S A, CAWOOD P A, WANG K Y , et al.Granitoid evolution in the Late Archean Wutai complex, North China Craton[J].Journal of Asian Earth Sciences.2005, 24: 597-613.
[18] KRÖNER A, WILDE S A, LI J H , et al.Age and evolution of a late Archean to Paleoproterozoic upper to lower crustal section in the Wutaishan/Hengshan/Fuping terrain of northern China[J].Journal of Asian Earth Sciences.2005, 24:577-595.
[19] 陈斌,刘树文,耿元生,等.吕梁-五台地区晚太古宙-古元古代花岗质岩石锆石U-Pb年代学和Hf同位素性质及其地质意义[J].岩石学报,2006,22(2):296-304.
[20] 杜利林,杨崇辉,任留东,等.吕梁地区2.2-2.1岩浆事件及其构造意义[J].岩石学报,2012,28(9):2751-2769.
[21] 杜利林,杨崇辉,王伟,等.五台地区滹沱群时代与地层划分新认识:地质学与锆石年代学证据[J].岩石学报,2011,27(4):1037-1055.
[22] 刘超辉,刘福来,赵国春.吕梁杂岩界河口群的源区特征及构造背景: 来自锆石U-Pb 年龄和Hf 同位素的证据[J].岩石学报,2013,29(2):517-532.
[23] 米广尧,米然,毛永栋.云中山区界河口岩群单颗粒锆石年龄及地质意义[J].矿物学报,2018,(2):176-184.
[24] LIU J Z, ZHANG F Q, QUYANG Z Y, et al.Geochemistry and chronology of metamorphic mafic volcanic rocks in Jiehekou Group, Lüliang mountains.Shanxi Province[J].Science in China(series D).2001, 31(2):111-118.
[25] 耿元生,万渝生,沈其韩,等.吕梁地区早前寒武纪主要地质事件的年代框架[J].地质学报,2000,74(3):216-223.
[26] 张兆琪,薛文彦,魏云峰,等.山西吕梁山北段岩片法填图新尝试[J].中国地质,2004,31(2):155-160.
[27] 田辉,王惠初,任云伟,等.山西云中山-关帝山地区界河口岩群岩石学特征、LA-ICP-MS 锆石U-Pb 年龄及其归属[J].地质通报,2014,33(5):672-683.
[28] ZHAO G C, SUN M, WILDE S A, et al.Late Archean to Paleoproterozoic evolution of the North China Craton: key issues revisited[J].Precambrian Res.2005, 136:177-202.
[29] SUN S S, AND MCDONOUGH W F.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.Special Publications 42.Geological Society, London, pp.1989, 313-345.
[30] INNOCENTI F, AGOSTINI S, VINCENZO G D,et al.Neogene and Quaternary volcanism in Western Anatolia: Magma sources and geodynamic evolution[J].Marine Geology.2005, 221:397-421.
[31] MULLEN E D.MnO/TiO2/P2O5: A minor element discriminant for basaltic rocks of oceanic environments and its implications for petrogenesis[J].Earth Planet.Sci.Lett.1983, 62:53-63.
[32] WOOD D A.The application of a Th-Hf-Ta diagram to problems of tectono-magmatic classification and to establishing the nature of crustal contamination of basaltic lava of the British Tertiary volcanic province[J].Earth and Planetary Science Letters.1980, 50(2):77-97.
[33] LANGMUIR C H, BENDER J F, BENCE A E.Petrogenesis of basalts from the famous area: Mid-Atlantic Ridge[J].Earth & Planetary Science Letters, 1977, 36(1):133-156.
[34] KIEFFER B, ARNDT N, LAPIERRE H, et al.Flood and Shield Basalts from Ethiopia: Magmas from the African Superswell[J].Journal of Petrology, 2004, 45(4):793-834.
[35] 吴昌华,钟长汀.华北陆台中段吕梁期的SW-NE 向碰撞晋蒙高级区孔兹岩系进入下地壳的构造机制[J].前寒武纪研究进展,1998,21(3):28-50.
[36] 李江海,钱祥麟,黄雄南,等.华北陆块基底构造格局及早期大陆克拉通化过程[J].岩石学报,2000,16(1):1-10.
[37] CONDIE K C, O’NEILL C, ASTER R C.Evidence and implications for a widespread magmatic shutdown for 250 My on Earth[J].Earth and Planetary Science Letters, 2009, 282:294-298.
[38] FRENCH J E, HEAMAN L M.Precise U-Pb dating of Paleoproterozoic mafic dyke swarms of the Dharwar craton, India:implications for the existence of the Neoarchean supercaraton Sclavia[J].Precambrian Research, 2000, 183(3):416-441.
[39] PARTIN C A, BEKKER A, SYLVESTER P J, et al.Filling in the Juvenile magmatic gap: evidence for uninterrupted Paleoproterozoic plate tectonics[J].Earth and Planetary Science Letters, 2014, 388:123-133.
[40] PEHRSSON S J, BUCHAN K L, EGLINGTON B M, et al.Did plate tectonics shutdown in the Palaeoproterozoic? A view from the Siderian geologic record[J].Gondwana Research, 2014, 26(3/4):803-815.
[41] 赵娇,张成立,郭晓俊,等.华北吕梁地区2.4 Ga A 型花岗岩的确定及地质意义[J].岩石学报, 2015,31(6):1606-1620.
[42] 翟明国.中国主要古陆与联合大陆的形成-综述与展望[J].中国科学(地球科学),2013,43(10):1583-1606.
[43] 杨崇辉,杜利林,任留东,等.河北赞皇地区许亭花岗岩的时代及成因:对华北克拉通中部带构造演化的制约[J].岩石学报,2011,27(4):1003-1016.
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