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    攀枝花大田地区前震旦纪斜长角闪岩地球化学特征及构造意义

    郑玉文 陈友良 彭渤洋 胡漾 郭锐 邓舟

    郑玉文, 陈友良, 彭渤洋, 胡漾, 郭锐, 邓舟, 2021. 攀枝花大田地区前震旦纪斜长角闪岩地球化学特征及构造意义. 地球科学, 46(1): 59-72. doi: 10.3799/dqkx.2019.279
    引用本文: 郑玉文, 陈友良, 彭渤洋, 胡漾, 郭锐, 邓舟, 2021. 攀枝花大田地区前震旦纪斜长角闪岩地球化学特征及构造意义. 地球科学, 46(1): 59-72. doi: 10.3799/dqkx.2019.279
    Zheng Yuwen, Chen Youliang, Peng Boyang, Hu Yang, Guo Rui, Deng Zhou, 2021. Geochemical Characteristics and Tectonic Significance of the Neoproterozoic Amphibolites from Datian Area, Panzhihua City. Earth Science, 46(1): 59-72. doi: 10.3799/dqkx.2019.279
    Citation: Zheng Yuwen, Chen Youliang, Peng Boyang, Hu Yang, Guo Rui, Deng Zhou, 2021. Geochemical Characteristics and Tectonic Significance of the Neoproterozoic Amphibolites from Datian Area, Panzhihua City. Earth Science, 46(1): 59-72. doi: 10.3799/dqkx.2019.279

    攀枝花大田地区前震旦纪斜长角闪岩地球化学特征及构造意义

    doi: 10.3799/dqkx.2019.279
    基金项目: 

    国家自然科学基金项目 41472073

    “康滇地轴前寒武纪混合岩中铀成矿远景预测评价” 201807-03

    详细信息
      作者简介:

      郑玉文(1995-), 女, 硕士研究生, 从事构造地质学及矿床地球化学研究工作.ORCID:0000-0002-2227-987X.E-mail:309722182@qq.com

      通讯作者:

      陈友良, ORCID:0000-0001-6844-3105.E-mail:chenyouliang09@cdut.cn

    • 中图分类号: P581;P597

    Geochemical Characteristics and Tectonic Significance of the Neoproterozoic Amphibolites from Datian Area, Panzhihua City

    • 摘要: 对攀枝花大田地区斜长角闪岩进行了系统的主微量地球化学特征、锆石LA-ICP-MS U-Pb年代学以及Lu-Hf同位素特征研究.结果表明:斜长角闪岩的SiO2含量为47.88%~50.05%,原岩为亚碱性-碱性玄武岩.斜长角闪岩稀土总量(ΣREE)较高,稀土元素配分模式为轻稀土富集的右倾型,与洋岛玄武岩相似.微量元素原始地幔标准化蛛网图为"隆起"型,与板内玄武岩特征类似.Zr/Nb、Hf/Th等比值均表明其与板内玄武岩类似,而与岛弧玄武岩具有明显的差异.锆石U-Pb定年结果表明岩浆结晶年龄为816.0~833.6 Ma,同期岩浆结晶锆石的εHf(t)值在-6.8~+3.8之间,其岩浆源区为与OIB类似的富集地幔源区且受到了地壳物质的混染.综合上述资料,认为其形成于Rodinia超级地幔柱活动导致的大陆裂谷环境.

       

    • 图  1  (a) 研究区大地构造位置; (b)攀枝花大田地区区域地质简图

      1.第四系浮土; 2.侏罗系长石石英砂岩; 3.咱里组三段; 4.咱里组二段; 5.咱里组一段; 6.印支期黑云母花岗岩; 7.印支期二云母花岗岩; 8.晋宁期石英闪长岩; 9.晋宁期含角闪石黑云母花岗岩; 10.辉绿岩脉; 11.断层; 12.钾长石化、绿泥石化蚀变带; 13.锆石采样位置; 14.研究区

      Fig.  1.  Tectonic setting map (a) and geological map of Datian area, Panzhihua City (b)

      图  2  斜长角闪岩野外露头(a)和镜下显微照片(b)

      Hbl.角闪石; Bt.黑云母; Pl.斜长石

      Fig.  2.  Photographs of the representative (a) and amphibolites in the Datian area (b)

      图  3  大田地区斜长角闪岩Zr/TiO2-Nb/Y图解

      Winchester and Floyd(1977)

      Fig.  3.  Zr/TiO2 vs. Nb/Y diagrams of the amphibolites in Datian area

      图  4  大田地区斜长角闪岩球粒陨石标准化稀土元素配分模式图(a)和微量元素原始地幔标准化蛛网图(b)

      球粒陨石和原始地幔标准化值据Sun and McDonough(1989);俯冲带玄武岩范围据Tatsumi and Eggins(1995)

      Fig.  4.  Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace elements spider diagram (b) for the amphibolites in Datian are

      图  5  DT1802锆石阴极发光图像

      每颗锆石上面的数值为测点年龄(Ma)和εHf(t), 下面为编号

      Fig.  5.  Zircon CL images from the amphibolite in Datian area (DT 1802)

      图  6  DT1802锆石U-Pb年龄谐和图

      Fig.  6.  SHRIMP U-Pb Concordia diagrams of zircon from the amphibolite in Datianarea(DT 1802)

      图  7  ZK4001-11锆石阴极发光图像及测点年龄

      每颗锆石上面的数值为测点年龄(Ma), 下面为编号

      Fig.  7.  Zircon CL images from the amphibolite in Datian area(ZK4001-11)

      图  8  ZK4001-11锆石U-Pb年龄谐和图(单位:Ma)

      Fig.  8.  SHRIMP U-Pb concordia diagrams of zircon from the amphibolite in Datian area(ZK4001-11)

      图  9  大田地区斜长角闪岩(176Hf/177Hf)i与锆石结晶年龄图解(a)和εHf(t)与锆石结晶年龄图解(b)

      a. 176Lu/177Hf=0.015据Griffin et al.(2002); b. Hf亏损地幔演化线据Dhuime(2011)

      Fig.  9.  Composite plot of (176Hf/177Hf)i vs. U-Pb age (a) and εHf(t) values vs. U-Pb age (b) of zircons for the rocks form Datian area

      图  10  大田地区斜长角闪岩的Zr/Nb-Ce/Y图解(a)和Nb/Yb-Th/Yb图解(b)

      OIB-type.洋岛型; E-MORB-type.富集型洋中脊型; N-MORB-type.正常洋中脊型; SSZ-type.俯冲带型;据Goncuoglu et al.(2010)

      Fig.  10.  Zr/Nb-Ce/Y diagram (a) and Nb/Yb-Th/Yb diagram (b) for the amphibolites in Datian area

      图  11  大田地区斜长角闪岩的Zr/Y-Zr图解(a)和Th-Hf/3-Nb/16图解(b)

      WPB.板内玄武岩; MORB.洋脊玄武岩; IAB.火山弧玄武岩; MORB.洋脊玄武岩; OIB.洋岛玄武岩; IAB.火山弧玄武岩; a.据Pearce(1982);b.据第鹏飞等(2017)

      Fig.  11.  Zr/Y-Zr diagram (a) and Th-Hf/3-Nb/16 diagram (b) for the amphibolites in Datian area

      图  12  大田地区斜长角闪岩的La/10-Y/15-Nb/8图解(a)和Ti/V图解(b)

      图a中:1.火山弧玄武岩; 2.大陆玄武岩; 3.大洋玄武岩; 1A.钙碱性玄武岩; 1C.火山弧拉斑玄武岩; 1B. 1A区和1B区间的重叠区域; 2A.大陆玄武岩; 2B.弧后盆地大陆玄武岩; 3A.大陆内裂谷区的碱性玄武岩; 3B及3C区为富集型洋脊玄武岩(3B区为富集区, 3C区为弱富集区); 3D.正常洋脊玄武岩; a.据Pearce(1982);b.据Shervais(1982)

      Fig.  12.  La/10-Y/15-Nb/8 diagram (a) and Ti/V diagram (b) for the amphibolites in Datian area

      图  13  大田地区斜长角闪岩Th/Hf-Ta/Hf(a)和Th/Zr-Nb/Zr(b)构造环境判别图解

      a.据汪云亮等(2001); b.据孙书勤等(2003)

      Fig.  13.  Th/Hf vs. Ta/Hf (a) and Th/Zr vs. Nb/Zr (b) tectonic setting discrimination diagrams for the amphibolites in Datian area

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