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首页> 外文期刊>Oceanographic Literature Review >Spatial and temporal influence of pacific subduction on south China: Geochemical migration of cretaceous mafic-intermediate rocks
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Spatial and temporal influence of pacific subduction on south China: Geochemical migration of cretaceous mafic-intermediate rocks

机译：太平洋郊区对华南地区的空间与颞影响：白垩纪镁铁质中间岩石的地球化学迁移

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摘要

The Cretaceous igneous rocks in the South China Block (SCB) were associated with the slab subduction and roll-back of the Pacific Plate. Thus, they provide excellent opportunities to examine the spatial-temporal geochemical migration of magmatism in the retreating subduction margins. The Cretaceous mafic-intermediate igneous rocks from the southeastern SCB were aged between 142 and 71 Ma, and can geochemically be subdivided into three groups: Group A (126-129 Ma and 83- 93 Ma), Group B (126-142 Ma and 71-108 Ma) and Group C (116-142 Ma and 70-110 Ma). Group A and B were mainly distributed in the SCB interior and derived from asthenosphere and astheno-sphere-lithosphere interaction sources, respectively. Group C occurred to the east of the Ganjiang Fault and originated from slab-lithosphere interaction. From the coastal provinces to the interior, these mafic-intermediate igneous rocks show increasing incompatible element ratios and Nd isotopic compositions, reflective of a westerly decreasing involvement of slab-derived components. They show two similar age-pulses at c. 125 Ma and c. 90 Ma as well as the Cretaceous A-type granites, indicating two episodes of subduction retreat of the Pacific slab during the Cretaceous. This spatial-temporal pattern of the Cretaceous mafic-intermediate igneous rocks suggests that the Cretaceous slab metasomatism of Pacific subduction retreat was limited to the east of the Ganjiang Fault.
机译：南方中国街区（SCB）的白垩纪火岩与太平板的板坯俯冲和回滚有关。因此，它们提供了良好的机会来检查岩浆中岩浆中的空间地球化学迁移在撤退的俯冲边缘。来自东南部SCB的白垩纪MAFIC-中间岩石在142和71 mA之间岁，并且可以将地球化学细分为三组：A组（126-129 mA和83-93 mA），B组（126-142 mA和71-108 mA）和C组（116-142 mA和70-110 mA）。 A组和B主要分布在SCB内部，并分别从哮喘圈和哮喘 - 球岩岩石圈相互作用源。 C组发生在赣江故障的东部，源于平滑岩石圈互动。从沿海省份到内部，这些乳头中间体的火岩显示出增加不相容的元素比率和ND同位素组合物，反映了植物衍生成分的西方累积。它们在C时显示出两个类似的年龄脉冲。 125 ma和c。 90 mA以及白垩纪A型花岗岩，表示在白垩纪期间太平洋板坯的两次俯冲阶段。这种白垩纪乳房中间岩石岩石的空间模式表明，太平洋俯冲撤退的白垩纪板坯偏定术仅限于甘江断层的东部。

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    《Oceanographic Literature Review》 |2020年第10期|2173-2173|共1页
  • 作者

    C. Gan; Y. Wang; T.L. Barry;

  • 作者单位

    Guangdong Provincial Key Lab of Geodynamics and Geohazards School of Earth Sciences and Engineering Sun Yat- sen University Guangzhou 510275 China;

    Guangdong Provincial Key Lab of Geodynamics and Geohazards School of Earth Sciences and Engineering Sun Yat- sen University Guangzhou 510275 China;

    Guangdong Provincial Key Lab of Geodynamics and Geohazards School of Earth Sciences and Engineering Sun Yat- sen University Guangzhou 510275 China;

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