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西藏改则县多龙SSZ型蛇绿岩的锆石U-Pb年龄、岩石地球化学及Sr-Nd同位素特征:班公湖-怒江洋晚二叠世洋内俯冲的证据
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  • 英文篇名:Zircon U-Pb age,geochemistry and Sr-Nd isotope characteristics of the Duolong SSZ-type ophiolites in Geize County,Tibet: Evidence for intra-oceanic subduction of the Bangonghu-Nujiang Ocean during the Late Permian
  • 作者:韦少港 ; 宋扬 ; 唐菊兴 ; 刘治博 ; 王勤 ; 高轲 ; 李壮 ; 李发桥
  • 英文作者:WEI Shao Gang;SONG Yang;TANG Ju Xing;LIU Zhi Bo;WANG Qin;GAO Ke;LI Zhuang;LI Fa Qiao;The Institute of Crustal Dynamics,China Earthquake Administration;The First Monitoring and Application Center,China Earthquake Administration;Institute of Mineral Resources,Chinese Academy of Geological Sciences;College of Earth Sciences,Chengdu University of Technology;Chengdu Institute of Geology and Mineral Resources,China Geological Survey;School of Earth Sciences and Resources,China University of Geosciences;
  • 关键词:特提斯洋 ; 多龙SSZ型蛇绿岩 ; 晚二叠世 ; 洋内俯冲 ; 西藏
  • 英文关键词:Bangonghu-Nujiang Ocean;;Duolong SSZ-type ophiolites;;Late Permian;;Intra-oceanic subduction;;Tibet
  • 中文刊名:YSXB
  • 英文刊名:Acta Petrologica Sinica
  • 机构:中国地震局地壳应力研究所;中国地震局第一监测中心;中国地质科学院矿产资源研究所;成都理工大学地球科学学院;中国地质调查局成都地质调查中心;中国地质大学地球科学与资源学院;
  • 出版日期:2019-02-15
  • 出版单位:岩石学报
  • 年:2019
  • 期:v.35
  • 基金:中国地质调查局项目(DD20160026);; 国家自然科学青年基金项目(41402178);; 中国地质科学院矿产资源研究所科技基础性工作专项(2014FY121000);; 中国地震局第一监测中心科技创新主任基金项目(FMC2018005)联合资助
  • 语种:中文;
  • 页:YSXB201902015
  • 页数:18
  • CN:02
  • ISSN:11-1922/P
  • 分类号:233-250
摘要
西藏改则县多龙矿集区分布着大量的SSZ型蛇绿岩残片,是班公湖-怒江蛇绿岩带的重要组成部分,本文对代表性辉绿(玢)岩进行了锆石U-Pb定年、岩石地球化学及Sr-Nd同位素分析,获得辉绿玢岩加权平均年龄为252.1±1.5Ma(MSWD=0.09,n=33),表明多龙SSZ型蛇绿岩形成于晚二叠世。岩石烧失量普遍较高(1.57%~5.23%)的特征,表明样品普遍遭受蚀变;而且具有富硅、高铝、低MgO及低Mg~#值(36.8~63.1)的特征,说明其经历过一定程度的分离结晶作用。多龙辉绿岩和辉绿玢岩富集大离子亲石元素(LILE:Rb、Cs、K、Sr、P、Pb),亏损高场强元素(HFSE:Ta、Nb、Ti、Zr、Hf);稀土元素总量为23.27×10~(-6)~58.95×10~(-6),δEu为0.83~1.35,(La/Yb)_N为0.66~1.30,具有与岛弧拉斑玄武岩类似的稀土元素和总体一致的微量元素特征。岩石(~(87)Sr/~(86)Sr)_i值为0.707345~0.708748,(~(143)Nd/~(144)Nd)_i值为0.512669~0.512705,t_(DM2)值为305~456Ma,ε_(Nd)(t)值为+6.9~+8.8,表明其岩浆源区为亏损地幔源区,其地球化学成分具有洋内弧的特征,暗示其可能是洋内俯冲作用的产物。综合分析认为,班-怒洋壳于晚二叠世时(ca.252Ma)在板块汇聚边缘发生了类似西太平洋Izu-Bonin-Mariana的洋内俯冲作用,形成兼具MOR蛇绿岩亲缘性和俯冲带SSZ蛇绿岩地球化学印记的双重属性的多龙辉绿岩及辉绿玢岩的母岩浆;母岩浆经过结晶分异、上升侵位,最终于洋内俯冲带之上的弧前盆地环境下形成多龙辉绿岩和辉绿玢岩。
        The Duolong SSZ-type ophiolites,located in the northwest of Geize County,Tibet,are important parts of the BangonghuNujiang ophiolite belt. This paper focuses on the zircon U-Pb dating,geochemistry and Sr-Nd isotope of the Duolong SSZ ophiolites.The representative allgovite yields zircon U-Pb weighted average age of 252. 1 + 1. 5 Ma( MSWD = 0. 09,n = 33),indicating that the Duolong SSZ-type ophiolite formed in the Late Permian. These rocks have high loss on ignition,indicating that they suffered from several alterations. Besides,they share high Si,high Al but low MgO and low Mg#value of 36. 8 to 63. 1,suggesting that they experienced a certain degree of separation crystallization. These SSZ-type ophiolites are systematically more enriched in large-ion lithophile elements( LILEs: Rb,Cs,K,Sr,P and Pb),relatively depleted in high strength elements( HFSE: Ta,Nb,TiZr and Hf). They yield total amount of rare earth elements of 23. 27 × 10~(-6)~ 58. 95 × 10~(-6),δEu of 0. 83 ~ 1. 35 and( La/Yb)Nratios of 0. 66 ~ 1. 30,which are similar to those of island arc tholeiite. Moreover,these SSZ-type ophiolites share(~(87)Sr/~(86)Sr)iratios of 0. 707345 ~ 0. 708748,(143 Nd/144 Nd)iratios of 0. 512669 ~ 0. 512705,tDM2 value of 305 ~ 456 Ma and ε_(Nd)( t) value of + 6. 9 ~ +8. 8,all indicating that their parent magma source region is a depleted mantle source region. The geochemical characteristics of the Duolong SSZ-type ophiolite are characterized by the intra-oceanic arc,suggesting that they may be products of the intra-oceanic subduction of the Bangonghu-NujiangOcean,which are recorded in present-day Donglong region. Comprehensive analysis shows that the northward subduction of Bangonghu-Nujiang Tethys oceanic crust occurred during the Late Permian( ca. 252 Ma). The geodynamics in convergent intra-oceanic margins is similar to that of the Izu-Bonin-Mariana in the Western Pacific,and this deep processes formed parent magma of Duolong ophiolites which share dual attributes of MOR-type ophiolite and SSZ-type ophiolite. After crystallization,the parent magma ascended and emplaced,eventually forming the Duolong SSZ-type ophiolite in the forearc basin environment above the intra-oceanic subduction zone.
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