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    长江中下游中生代安山质火山岩记录的新元古代大洋板片-地幔相互作用

    陈龙 郑永飞

    陈龙, 郑永飞, 2019. 长江中下游中生代安山质火山岩记录的新元古代大洋板片-地幔相互作用. 地球科学, 44(12): 4144-4151. doi: 10.3799/dqkx.2019.243
    引用本文: 陈龙, 郑永飞, 2019. 长江中下游中生代安山质火山岩记录的新元古代大洋板片-地幔相互作用. 地球科学, 44(12): 4144-4151. doi: 10.3799/dqkx.2019.243
    Chen Long, Zheng Yongfei, 2019. Neoproterozoic Oceanic Slab-Mantle Interaction: Geochemical Evidence from Mesozoic Andesitic Rocks in the Middle and Lower Yangtze Valley. Earth Science, 44(12): 4144-4151. doi: 10.3799/dqkx.2019.243
    Citation: Chen Long, Zheng Yongfei, 2019. Neoproterozoic Oceanic Slab-Mantle Interaction: Geochemical Evidence from Mesozoic Andesitic Rocks in the Middle and Lower Yangtze Valley. Earth Science, 44(12): 4144-4151. doi: 10.3799/dqkx.2019.243

    长江中下游中生代安山质火山岩记录的新元古代大洋板片-地幔相互作用

    doi: 10.3799/dqkx.2019.243
    基金项目: 

    国家“973”计划项目“大陆俯冲带壳幔相互作用” 2015CB856106

    国家青年科学基金项目“冈底斯岩基晚白垩世镁铁质侵入岩地球化学研究” 41703025

    详细信息
      作者简介:

      陈龙(1985—), 男, 副研究员, 主要从事岩浆岩地球化学和俯冲带化学地球动力学研究

    • 中图分类号: P581

    Neoproterozoic Oceanic Slab-Mantle Interaction: Geochemical Evidence from Mesozoic Andesitic Rocks in the Middle and Lower Yangtze Valley

    • 摘要: 大陆弧安山岩的形成是大洋板片向大陆边缘之下俯冲的结果,但是在具体形成机制上存在很大争议.针对这个问题,对长江中下游地区中生代安山质火山岩及其伴生的玄武质和英安质火山岩进行了系统的岩石地球化学研究,结果对大陆弧安山质火成岩的成因提出了新的机制.分析表明,这些岩石形成于早白垩世,它们不仅表现出典型的岛弧型微量元素分布特征,而且具有高度富集的Sr-Nd-Hf同位素和高的放射成因Pb以及高的氧同位素组成.通过全岩和矿物地球化学成分变化检查发现,地壳混染和岩浆混合作用对其成分的富集特征贡献有限,而其岩浆源区含有丰富的俯冲地壳衍生物质才是其成分富集的根本原因.虽然这些火山岩的喷发年龄为中生代,但是其岩浆源区形成于新元古代早期的华夏洋壳俯冲对扬子克拉通边缘之下地幔楔的交代作用.大陆弧安山岩地幔源区中含有大量俯冲洋壳沉积物部分熔融产生的含水熔体,显著区别于大洋弧玄武岩的地幔源区,其中只含有少量俯冲洋壳来源的富水溶液和含水熔体.正是这些含水熔体交代上覆地幔楔橄榄岩,形成了不同程度富集的超镁铁质-镁铁质地幔源区.在早白垩纪时期,古太平洋俯冲过程的远弧后拉张导致中国东部岩石圈发生部分熔融,其中超镁铁质地幔源区熔融形成玄武质火山岩,镁铁质地幔源区则熔融形成安山质火山岩.因此,大陆弧安山岩成因与大洋弧玄武岩一样,可分为源区形成和源区熔融两个阶段,其中第一阶段对应于俯冲带壳幔相互作用.

       

    • 图  1  长江中下游地区庐枞盆地火山岩原始地幔标准化的微量元素分布图

      Chen et al.(2014);GLOSS.全球俯冲沉积物平均组成(Plank and Langmuir, 1998);CAA.大陆弧安山岩(Kelemen et al., 2014);OAB.大洋弧玄武岩(Kelemen et al., 2014).原始地幔微量元素组成根据McDonough and Sun (1995)

      Fig.  1.  Primitive mantle⁃normalized trace element patterns for the Luzong volcanics in the Middle⁃Lower Yangtze River belt, South China

      图  2  长江中下游地区庐枞盆地火山岩初始Sr⁃Nd⁃Hf⁃Pb同位素组成图解

      同位素初始值回算到130 Ma;据Chen et al.(2014)

      Fig.  2.  The initial Sr and Nd, Hf and Pb isotope correlation diagrams for the Luzong volvanics in the Middle⁃Lower Yangtze River belt, South China

      图  3  长江中下游地区庐枞盆地火山岩锆石δ18O值统计

      Chen et al.(2014);正常地幔锆石δ18O为5.3‰±0.3‰ (Valley et al., 1998)

      Fig.  3.  Histogram of zircon δ18O values for Luzong volvanics in the Middle⁃Lower Yangtze River belt, South China

      图  4  长江中下游地区庐枞盆地火山岩全岩La和(La/Sm)N图解

      Chen et al.(2014)

      Fig.  4.  Whole⁃rock La contents versus (La/Sm)N ratios for the Luzong volcanics in the Middle⁃Lower Yangtze River belt, South China

      图  5  长江中下游地区庐枞盆地火山岩全岩SiO2含量和初始Nd同位素组成相关图

      Chen et al.(2014)

      Fig.  5.  Correlation diagrams between SiO2 content and initial Nd isotope ratio for the Luzong volcanics in the Middle⁃Lower Yangtze River belt, South China

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    • 收稿日期:  2019-09-10
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