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首页> 外文期刊>Mineralogy and Petrology >Petrogenesis and tectonic implications of Late Jurassic shoshonitic lamprophyre dikes from the Liaodong Peninsula, NE China
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Petrogenesis and tectonic implications of Late Jurassic shoshonitic lamprophyre dikes from the Liaodong Peninsula, NE China

机译：中国东北辽东半岛晚侏罗世的沙生煌斑岩岩的岩石成因及其构造意义

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摘要

This paper presents detailed mineral chemical, element geochemical and Sr–Nd–Hf isotopic data for the Late Jurassic (155 ± 4 Ma) lamprophyre dikes in the Liaodong Peninsula, NE China. The lamprophyres are shoshonitic and geochemically fall into three groups: Group I has relatively high SiO2 (52.5–57.0 wt.%), low MgO (5.5–8.3 wt.%) and compatible trace element (e.g. Cr = 128–470 ppm) contents, high initial 87Sr/86Sr ratios (0.7093–0.7117), and low εNd (T) values (−9.6 to −12.1); Group II has relatively low SiO2 (44.8–50.0 wt.%), high MgO (10.8–14.2 wt.%) and compatible trace element (e.g. Cr = 456–1,041 ppm) contents, low initial 87Sr/86Sr ratios (0.7073–0.7087), and high εNd (T) values (−1.4 to −2.9); Group III is transitional between the two in all elemental and isotopic compositions. Interpretation of the elemental and isotopic data suggests that the lamprophyric melts were derived by partial melting of subcontinental lithospheric mantle (SCLM) at a depth of 60–80 km (group I), decompression melting of upwelling asthenosphere at 60–100 km (group II), and mixing between the SCLM-derived and asthenosphere-derived melts (group III). It is assumed that the local SCLM was detached at a depth of 60–80 km by the 155 Ma ago. A continental arc-rifting related to the Palaeo-Pacific plate subduction is favored as a geodynamic force for such a cratonic lithosphere detachment.
机译：本文介绍了中国东北辽东半岛晚侏罗世（155±4 Ma）煌斑岩堤的详细矿物化学，元素地球化学和Sr–Nd–Hf同位素数据。煌斑岩为生辉岩，地球化学分为三类：第一类具有较高的SiO2（52.5-57.0 wt。％），低的MgO（5.5-8.3 wt。％）和相容的痕量元素（例如Cr = 128- 470 ppm）的含量，高的初始87 Sr / 86 Sr比（0.7093-0.7117）和低的εNd（T）值（-9.6至-12.1）；第二组具有相对较低的SiO2（44.8–50.0 wt。％），高的MgO（10.8–14.2 wt。％）和相容的痕量元素（例如Cr = 456–1,041 ppm），较低的初始87 > Sr / 86 Sr比（0.7073–0.7087）和高εNd（T）值（-1.4至-2.9）；第三组在所有元素和同位素组成的两者之间是过渡的。元素和同位素数据的解释表明，煌斑岩的融化是通过在60–80 km深度（I组）对亚大陆岩石圈地幔（SCLM）的部分融化，在60–100 km处的上升流软流圈的减压融化而获得的（II组） ），并在SCLM衍生的和软流圈衍生的熔体之间混合（III组）。假定当地的SCLM在155 Ma之前已在60–80 km的深度分离。与古太平洋板块俯冲有关的大陆弧裂陷被认为是这种克拉通岩石圈破裂的地球动力。

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  • 来源
    《Mineralogy and Petrology》 |2010年第4期|p.127-151|共25页
  • 作者

    Yao-Hui Jiang; Shao-Yong Jiang; Hong-Fei Ling; Pei Ni;

  • 作者单位

    State key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210093, China;

    State key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210093, China;

    State key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210093, China;

    State key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210093, China;

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