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首页> 外文期刊>International Journal of Earth Sciences >Silurian to early Permian slab melting and crustal growth in the southern Altaids: insights from adakites and associated mineral deposits in the Dananhu arc, Eastern Tianshan, NW China
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Silurian to early Permian slab melting and crustal growth in the southern Altaids: insights from adakites and associated mineral deposits in the Dananhu arc, Eastern Tianshan, NW China

机译：Silurian到南部南部的二叠师融合和地壳增长：来自丹南弧，天山东部的Adakites和相关矿物矿床的见解

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摘要

The mechanics of crustal growth in the Altaids during the Phanerozoic is still not well understood. This paper reports new geochronological, geochemical, and isotopic data from Paleozoic adakitic intrusions in the Dananhu arc in the Chinese Eastern Tianshan with the aim of better understanding the specific mechanisms of crustal growth. Our new LA-ICPMS U-Pb zircon age data show that four phases of adakitic intrusions formed at 410-413 Ma, 385-387 Ma, 335 Ma, and 313-311 Ma. Combined with previous data of ours and from the literature, there were seven phases of adakitic intrusions from the Silurian to early Permian. All these adakitic intrusions have distinctive geochemical-isotopic signatures with high Na and Al, high Sr, low Yb and Y, high Sr/Y and (La/Yb)(N) values, relatively high MgO contents and Mg numbers (Mg# = 41-70), high abundances of compatible elements (Cr = 1.66-46.30 ppm, Ni = 2.40-26.96 ppm), and positive high epsilon(Hf) (t) (+ 7.1 to + 15.6) and a T-DM (Ma) range from 325 to 670 Ma. These adakitic intrusions were associated with essential Cu polymetallic mineralization in the Dananhu arc. The above chemical data and relations indicate that the processes of oceanic slab melting generated these adakitic rocks. Our new geochronological, geochemical and isotopic data, integrated with the geology of the Dananhu intra-oceanic arc, lead us to conclude that multiphase of hot/young oceanic crust subduction and melting generated the massive crustal growth in the Silurian-early Permian. Our results indicate that the magmas were derived by slab melting of hot/young oceanic crust, which was one of the most critical mechanisms of continental crustal growth in the Paleozoic accretionary orogen of the Altaids.
机译：在北曲期间的石头石油成长的机制仍然不太了解。本文报告了在天山东南弧古生代Adakitic Intrings中的新地理学，地球化学和同位素数据，旨在更好地理解地壳增长的具体机制。我们的新LA-ICPMS U-PB锆石年龄数据显示，在410-413 mA，385-387mA，335 mA和313-311 mA中形成的四个阶段的Adakitic Intrings。结合我们的先前数据和文献，从艾尔厄里亚语到早期二叠纪有七个阶段的adakitic入侵。所有这些AdaKitic Intrings都具有具有高Na和Al，高Sr，低Yb和Y，高Sr / Y和（La / Yb）（n）值，相对高的MgO内容物和Mg编号（Mg＃= 41-70），高丰度的相容元素（Cr = 1.66-46.30 ppm，Ni = 2.40-26.96ppm）和正高ε（HF）（T）（+ 7.1至+ 15.6）和T-DM（MA ）范围从325到670 mA。这些AdaAgitic Intringians与Dananhu弧中的基本Cu多金属矿化有关。上述化学数据和关系表明海洋板坯熔化的过程产生了这些粘土岩。我们的新地理学，地球化学和同位素数据，与丹南内海洋地质的地质集成，引导我们得出结论，热/幼群地壳俯冲和融化的多相在硅里安早期二叠纪产生了大规模的地壳增长。我们的结果表明，岩浆是由热/幼脑地壳的平板熔化来源的，这是古生古生代植物古老的古生地壳增长的最关键机制之一。

著录项

  • 来源
    《International Journal of Earth Sciences》 |2021年第6期|2115-2131|共17页
  • 作者

    Mao Qigui; Ao Songjian; Song Dongfang; Xiao Wenjiao; Windley Brian F.; Sang Miao; Tan Zhou; Wang Hao; Li Rui;

  • 作者单位

    Chinese Acad Sci Xinjiang Res Ctr Mineral Resources Xinjiang Inst Ecol & Geog Urumqi 830011 Peoples R China|Redrock Min CO Ltd Hami 839000 Peoples R China;

    Chinese Acad Sci Inst Geol & Geophys State Key Lab Lithospher Evolut Beijing 100029 Peoples R China|Univ Chinese Acad Sci Coll Earth & Planetary Sci Beijing 100049 Peoples R China|Chinese Acad Sci China Pakistan Joint Res Ctr Earth Sci Inst Mt Hazards & Environm Chengdu 610041 Peoples R China;

    Chinese Acad Sci Inst Geol & Geophys State Key Lab Lithospher Evolut Beijing 100029 Peoples R China|Univ Chinese Acad Sci Coll Earth & Planetary Sci Beijing 100049 Peoples R China;

    Chinese Acad Sci Xinjiang Res Ctr Mineral Resources Xinjiang Inst Ecol & Geog Urumqi 830011 Peoples R China|Chinese Acad Sci Inst Geol & Geophys State Key Lab Lithospher Evolut Beijing 100029 Peoples R China|Univ Chinese Acad Sci Coll Earth & Planetary Sci Beijing 100049 Peoples R China|Chinese Acad Sci China Pakistan Joint Res Ctr Earth Sci Inst Mt Hazards & Environm Chengdu 610041 Peoples R China;

    Univ Leicester Sch Geog Geol & Environm Leicester LE1 7RH Leics England;

    Chinese Acad Sci Xinjiang Res Ctr Mineral Resources Xinjiang Inst Ecol & Geog Urumqi 830011 Peoples R China;

    Chinese Acad Sci Xinjiang Res Ctr Mineral Resources Xinjiang Inst Ecol & Geog Urumqi 830011 Peoples R China;

    Chinese Acad Sci Xinjiang Res Ctr Mineral Resources Xinjiang Inst Ecol & Geog Urumqi 830011 Peoples R China;

    Chinese Acad Sci Xinjiang Res Ctr Mineral Resources Xinjiang Inst Ecol & Geog Urumqi 830011 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Adakite; Oceanic slab melting; Crustal growth; Accretionary orogeny; Eastern Tianshan;

    机译：Adakite;海洋板坯融化;地壳增长;痛苦的orenogy;天山东部;

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