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    扬子西缘祥云响水花岗岩体的成因:锆石U-Pb年代学、岩石地球化学和Sr-Nd同位素制约

    刘桂春 陈光艳 李静 陈棵 孙柏东 马进华 钱鑫 赵天宇

    刘桂春, 陈光艳, 李静, 陈棵, 孙柏东, 马进华, 钱鑫, 赵天宇, 2020. 扬子西缘祥云响水花岗岩体的成因:锆石U-Pb年代学、岩石地球化学和Sr-Nd同位素制约. 地球科学, 45(7): 2426-2440. doi: 10.3799/dqkx.2020.041
    引用本文: 刘桂春, 陈光艳, 李静, 陈棵, 孙柏东, 马进华, 钱鑫, 赵天宇, 2020. 扬子西缘祥云响水花岗岩体的成因:锆石U-Pb年代学、岩石地球化学和Sr-Nd同位素制约. 地球科学, 45(7): 2426-2440. doi: 10.3799/dqkx.2020.041
    Liu Guichun, Chen Guangyan, Li Jing, Chen Ke, Sun Bodong, Ma Jinhua, Qian Xin, Zhao Tianyu, 2020. Petrogenesis of Xiangshui Granite from Xiangyun, in the West Margin of Yangtze Block: Zircon U-Pb Geochronology, Geochemical and Sr-Nd Isotope Constraints. Earth Science, 45(7): 2426-2440. doi: 10.3799/dqkx.2020.041
    Citation: Liu Guichun, Chen Guangyan, Li Jing, Chen Ke, Sun Bodong, Ma Jinhua, Qian Xin, Zhao Tianyu, 2020. Petrogenesis of Xiangshui Granite from Xiangyun, in the West Margin of Yangtze Block: Zircon U-Pb Geochronology, Geochemical and Sr-Nd Isotope Constraints. Earth Science, 45(7): 2426-2440. doi: 10.3799/dqkx.2020.041

    扬子西缘祥云响水花岗岩体的成因:锆石U-Pb年代学、岩石地球化学和Sr-Nd同位素制约

    doi: 10.3799/dqkx.2020.041
    基金项目: 

    国家自然科学基金项目“滇西南原特提斯及其与古特提斯演化关系研究” 41672222

    中国地质调查局项目“云南区域地质调查片区总结与服务产品开发” 121201102000150012-02

    中国地质调查局项目“全国陆域及海区地质图件更新与共享” DD20190370

    详细信息
      作者简介:

      刘桂春(1982-), 男, 博士, 高级工程师, 从事区域地质调查工作.ORCID:0000-0002-8410-0820.E-mail:liuguichun15@sina.com

      通讯作者:

      李静, ORCID:0000-0002-1531-7911.E-mail:lijing641229@163.com

    • 中图分类号: P597

    Petrogenesis of Xiangshui Granite from Xiangyun, in the West Margin of Yangtze Block: Zircon U-Pb Geochronology, Geochemical and Sr-Nd Isotope Constraints

    • 摘要: 滇西至滇中一带新元古代镁铁质岩类、花岗岩类等岩浆岩有广泛分布,前人利用不同岩石组合指示这些岩浆岩形成于不同的地质构造背景.通过对祥云一带调查研究,新确定了南华纪花岗岩体,花岗岩体中含有大量的超镁铁质岩(橄榄辉长岩)、闪长岩类包体,包体与花岗岩不规则边界呈成分渐变,混合形成为花岗闪长岩、石英闪长岩、英云闪长岩类岩石.对花岗岩和铁镁质包体进行锆石U-Pb LA-ICP-MS同位素测年,获得了相近的206Pb/238U平均年龄:761.9±4.1 Ma、761.7±4.2 Ma、761.3±3.7 Ma和757.5±5.9 Ma.花岗岩主量元素显示具有高碱(alk)、中等Mg#(38~57,平均值为50)、低TiO2、P和亏损Ta、Nb、Sr特点,展现了富集轻稀土元素(LREEs)、亏损重稀土元素(HREEs)和选择性富集大离子亲石元素(LILEs)等特点,并且其εNdt)为负值(-2.73~-4.90),表明花岗岩浆的物质应为早期古老地壳部分熔融的产物;橄榄辉长岩包体地球化学特征为:低K2O,低稀土总量,LREEs和LILEs略富集或不富集,具明显P负异常,Nb-Ta和Zr-Hf无亏损,具有非常高的Mg#(71~83)等特点,这些特征都指示这些橄榄辉长岩来源于幔源,应为地幔边缘岩浆熔融的产物.花岗闪长岩、闪长岩具有略富集LREE和LILE、亏损HREE,其Mg#(45~71)较高,P亏损、负εNdt)值等特征,Ta、Nb、Ti、Sr、P略亏损或不亏损,组分介于花岗岩和橄榄辉长岩之间,显示了幔源和古老地壳部分熔融混合特点.这些岩石都展示陆源弧岩浆岩的构造背景,大洋板块向扬子板块俯冲导致幔源物质重熔的结果.

       

    • 图  1  华南新元古代岩浆岩分布图(a)、滇中南华纪侵入岩分布图(b)和研究区区域地质简图(c)

      a.据Chen et al.(2017)修改(年龄数据引用Yang et al., 2016; Wang et al., 2016; Chen et al., 2017);b.据《云南省成矿地质背景研究》之侵入岩分布图修编;c.据“1:25万大理幅”修编;1.二叠纪峨眉山玄武岩;2.二叠纪辉绿岩;3.古近纪石英斑岩; 4.南华纪花岗岩;5.奥陶系;6.泥盆系;7.石炭-二叠系;8.三叠系;9.侏罗系;10.白垩系;11.第四系;12.整合/角度不整合接触;13.断裂;14.采样位置

      Fig.  1.  (a) Distribution of Neoproterozoic magmatic rocks in the South China block, (b) distribution of Neoproterozoic magmatic rocks in the middle of Yunnan and (c) geologic sketch of study area

      图  2  云南省宾川县南响水花岗体野外宏观露头岩石特征(a~b)及岩石镜下特征(c~f)

      a.浅灰色带肉色中粗粒浅色花岗岩(D007-10-1)与灰绿色闪长岩产出关系及岩浆混合特征;b.浅灰色中粗粒浅色花岗岩与深绿灰色蛇纹石化橄榄辉长岩包体(D7001-13-2)产出关系及岩浆混合特征;c.中粗粒花岗岩(D007-10-1) (正交偏光);d.蛇纹石化橄榄辉长岩(D7001-13-2) (单偏光);e.铁泥化绢云母化黑云石英闪长岩(D7001-15-1) (单偏光);f.似斑状花岗闪长岩(D7001-19-1) (正交偏光);Ol.橄榄石;Cpx.单斜辉石;Hb.角闪石;Bt.黑云母;Pl.斜长石;Kfs.钾长石;Qtz.石英

      Fig.  2.  Field photos (a and b) and micrographs (c-f) showing the mineral assemblages and microstructures of the Neoproterozoic granitoids, diorite and olivine-gabbro inclusion from Xiangshui, south Binchuan county of middle Yunnan

      图  3  云南省宾川县南响水花岗岩体不同岩石中典型锆石协和年龄图及CL图

      Fig.  3.  Concordia diagrams of zircon U-Pb data and cathodoluminescence (CL) image for representative zircon grains from Xiangshui, South Binchuan county of middle Yunnan

      图  4  (a) TAS图, (b) FeOt/MgO-SiO2图, (c) K2O-SiO2图和(d) A/NK-A/CNK图

      Fig.  4.  The distinguished diagrams, (a) TAS diagram, (b)FeOt/MgO-SiO2 diagram, (c) K2O-SiO2 diagram and (d) A/NK-A/CNK diagram

      图  5  响水花岗岩Harker图及主量元素变化关系

      图b据Chappell (1999);图c据Green and Pearson (1986)

      Fig.  5.  Harker diagrams of major-element compositions from the Xiangshui granites

      图  6  云南省宾川县南响水花岗岩类、闪长岩、橄榄辉长岩球粒陨石标准化稀土元素蛛网图(a, c, e)和原始地幔标准化微量元素蛛网图(b, d, f)

      标准化值据Sun and McDonough (1989);陆源弧玄武岩、陆源弧安山岩曲线据Condie (1989);陆源弧安山岩、英安岩、流纹岩曲线据Drummond et al. (1996)

      Fig.  6.  Chondrite-normalized REE patterns (a, c, e) and primitive mantle-normalized spider diagram (b, d, f) of granitoids, diorite and olivine-gabbro inclusion from Xiangshui granites in south Binchuan county, Yunnan

      图  7  扬子西缘响水花岗岩类、闪长岩和橄榄辉长岩包体初始Sr-Nd同位素组成

      图中Sr-Nd同位素区域为Gangdese (藏南)和Lachlan (澳大利亚) I-型花岗岩、华南东部Kwangsian阶和Indosinian阶花岗岩以及前寒武纪变质沉积岩岩石,来源Wang et al. (2016)

      Fig.  7.  Initial Sr-Nd isotopic composition for the Xiangshui granitoids, diorite and olivine-gabbro inclusion of the SW Yangtze Block

      图  8  响水花岗岩体εNd(t)-SiO2图解

      亏损地幔(SiO2=45%, Nd=11.3×10-6, εNd(t)=+7.3);洋中脊玄武岩熔融(SiO2=48%, Nd=20.0×10-6, εNd(t)=+7.3);初始弧火山(SiO2=47.4%, Nd=10.1×10-6, εNd(t)=+7.3);沉积岩熔融(SiO2=75%, Nd=183.0×10-6, εNd(t)=-2.0);俯冲相关的洋盆沉积岩(SiO2=75%, Nd=27.0×10-6, εNd(t)=-1.8);早元古代沉积岩(SiO2=82.7%, Nd=59.6×10-6, εNd(t)=-16.6);太古代沉积岩(SiO2=76.4%, Nd=131.0×10-6, εNd(t)=-23.1)

      Fig.  8.  εNd(t) vs. SiO2 diagram from Xiangshui granite

      图  9  响水花岗岩体Ti-Zr图(a)、Ti/Zr vs. Zr/Y图(b)和La/Yb vs. Th/Yb图(c)

      a.据Göncüoglu et al. (2010); b.据Condie (1989); c.据Condie (1989)

      Fig.  9.  Ti-Zr diagram (a), Ti/Zr vs. Zr/Y diagram (b) and La/Yb vs. Th/Yb diagram (c) for the Xiangshui granite

      图  10  响水花岗岩Rb/30-Hf-Ta×3 (a)和Rb-(Y+Nb) (b)图

      a.据Harris et al. (1986); b.据Pearce (1996)

      Fig.  10.  Rb/30-Hf-Ta×3 (a) and Rb-(Y+Nb) (b) diagrams for Xiangshui granitoid

      图  11  扬子西缘俯冲作用及岩浆演化特征

      底图据Chen et al. (2017)修改

      Fig.  11.  Subduction of the ocean towards the Yangtze block showing the magmatic evolution

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