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    中国东南部晚中生代基性岩脉地幔源区的岩性演化历史

    雷祝梁 曾罡 王小均 陈立辉

    雷祝梁, 曾罡, 王小均, 陈立辉, 2019. 中国东南部晚中生代基性岩脉地幔源区的岩性演化历史. 地球科学, 44(4): 1159-1168. doi: 10.3799/dqkx.2019.021
    引用本文: 雷祝梁, 曾罡, 王小均, 陈立辉, 2019. 中国东南部晚中生代基性岩脉地幔源区的岩性演化历史. 地球科学, 44(4): 1159-1168. doi: 10.3799/dqkx.2019.021
    Lei Zhuliang, Zeng Gang, Wang Xiaojun, Chen Lihui, 2019. Mantle Source Lithology of Late Mesozoic Mafic Dikes in Southeastern China. Earth Science, 44(4): 1159-1168. doi: 10.3799/dqkx.2019.021
    Citation: Lei Zhuliang, Zeng Gang, Wang Xiaojun, Chen Lihui, 2019. Mantle Source Lithology of Late Mesozoic Mafic Dikes in Southeastern China. Earth Science, 44(4): 1159-1168. doi: 10.3799/dqkx.2019.021

    中国东南部晚中生代基性岩脉地幔源区的岩性演化历史

    doi: 10.3799/dqkx.2019.021
    基金项目: 

    国家自然科学基金项目 41672048

    详细信息
      作者简介:

      雷祝梁(1995-), 男, 硕士研究生, 矿物学、岩石学、矿床学专业

      通讯作者:

      曾罡

    • 中图分类号: P581

    Mantle Source Lithology of Late Mesozoic Mafic Dikes in Southeastern China

    • 摘要: 中国东南部晚中生代的岩浆活动被认为与古太平洋板块的俯冲作用密切相关,而板块的俯冲作用又势必会对地幔的性质产生重要影响.晚中生代基性岩脉在中国东南部尤其是沿海地区广泛分布,为揭示中国东南部地幔演化历史及其与古太平洋板块俯冲之间的潜在成因联系提供了理想的研究对象.因此,对湘、赣、浙、闽、粤五省基性岩脉的年代学和地球化学数据进行了总结,通过恢复它们的原始岩浆组成,厘定其地幔源区岩性,揭示了研究区地幔的岩性演化历史.研究发现,中国东南部晚中生代基性岩脉的源区岩性在地域上没有显著差异,在时间尺度上表现出明显变化.在150~110 Ma期间,中国东南部地幔源区的岩性包含富硅辉石岩和贫硅辉石岩两类;而在110~64 Ma期间,地幔源区的主体岩性转变为贫硅辉石岩,伴随部分橄榄岩.基于上述地幔岩性的演化规律,并结合前人对研究区基性玄武岩的研究工作,认为研究区晚中生代地幔的岩性转变主要受控于古太平洋板块的俯冲过程,是板块俯冲角度改变的结果.

       

    • 图  1  中国东南部晚中生代基性岩脉分布

      Zeng et al.(2016)修改

      Fig.  1.  Distribution of the Late Mesozoic mafic dikes in southeastern China

      图  2  中国东南部晚中生代基性岩脉全岩MgO与CaO/Al2O3协变图

      基性岩脉数据来源已在文中列出,黑色十字表示用“Petrolog 3”软件(Danyushevsky and Plechov, 2011)模拟的分离结晶过程,初始熔体1、2分别为Xyk4和ZHC-13的原始岩浆成分,潜在结晶矿物相为橄榄石(Ol)和单斜辉石(Cpx),“L-Ol”表示橄榄石分离结晶,“L-Ol-Cpx”表示橄榄石和单斜辉石分离结晶,“L+Ol”表示橄榄石堆晶

      Fig.  2.  Variations of CaO/Al2O3 versus MgO for Late Mesozoic mafic dikes in southeastern China

      图  3  中国东南部晚中生代基性岩脉全岩SiO2与K2O/TiO2协变图

      其中经历过单斜辉石分离结晶的样品(MgO < 7.5%,图中半透明符号所示)已被排除;中国东部大陆地壳数据引自Gao et al.(1998)

      Fig.  3.  Variations of K2O/TiO2 versus SiO2 for the Late Mesozoic mafic dikes in southeastern China

      图  4  中国东南部晚中生代基性岩脉原始岩浆成分相图(a); MgO与CaO协变图(b); MgO与SiO2协变图(c)

      图a为以摩尔比例从Diopside向CATS-Olivine-Quartz平面投影的假三元相图(Herzberg, 2011),箭头表示温度降低方向;图b中黑色分离结晶趋势线以及橄榄岩实验熔体(2~7 GPa)区域据Herzberg (2011);图c中贫硅辉石岩、富硅辉石岩及橄榄岩实验熔体区域,华南晚中生代玄武岩原始岩浆数据均据Zeng et al.(2016),缩写:Ol.橄榄石;Cpx.单斜辉石;Opx.斜方辉石、Qz.石英;Grt.石榴子石;Plag.斜长石

      Fig.  4.  Phase diagram of primary magmas for Late Mesozoic mafic dikes in southeastern China (a), variations of CaO versus MgO (b), variations of SiO2 versus MgO (c)

      图  5  中国东南部晚中生代基性岩脉Fe/Mn与FeOT/CaO-3MgO/SiO2协变图

      橄榄岩熔体推荐FC3MS值上限(0.65)、橄榄岩和辉石岩实验熔体数据引自Yang et al.(2016)

      Fig.  5.  Variations of FeOT/CaO-3MgO/SiO2 versus Fe/Mn for the Late Mesozoic mafic dikes in southeastern China

      图  6  中国东南部晚中生代构造-岩浆演化模式

      Fig.  6.  The tectono-magmatic evolution of southeastern China during Late Mesozoic

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