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首页> 外文期刊>Journal of Asian earth sciences >Geochronology, geochemistry and origins of the Paleozoic-Triassic plutons in the Langshan area, western Inner Mongolia, China
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Geochronology, geochemistry and origins of the Paleozoic-Triassic plutons in the Langshan area, western Inner Mongolia, China

机译：内蒙古西部Lang山地区古生代-三叠纪岩体的年代学，地球化学及其成因

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摘要

The Langshan area is the northeastern part of the Alxa block and adjacent to the Inner Mongolia-Da Hing-gan Orogenic Belt (IMDOB) to the north, and geochronological and geochemical studies of the Langshan plutons would be helpful for unraveling the relationship of the magmatism in the Langshan area with that in the IMDOB. Based on zircon U-Pb ages presented in this study and in published papers, five mag-matic stages are recognized in Langshan area: Late Silurian (～418 Ma), Carboniferous (328-304 Ma), Early Permian (294-272 Ma), Late Permian (260-254 Ma) and Middle-Late Triassic (245-227 Ma). The Late Silurian two-mica granite is peraluminous and has a source from ancient continental crust, indicating a collision event. The late Early Carboniferous mafic plutons are subalkaline, show appinitic affinities, and may originate from the subduction-modified continental lithospheric mantle. The late Early Permian granodiorite is weakly peraluminous and high-K calc-alkaline and may be derived from ancient continental crust, while the late Early Permian alkaline gabbro-diorite displays EM I-like Sr-Nd isotopic signatures, indicating an enriched subcontinental lithospheric mantle source. The Late Permian granodiorite is calc-alkaline and peraluminous and may result from the partial melting of ancient lower continental crust, whereas the Late Permian leuconorite belongs to low-K tholeiitic series and has a cumulate origin from an enriched mantle source with the input of juvenile mantle materials. The Paleozoic-Triassic mag-matic stages in the Langshan area are consistent with the main magmatic periods in the northern NCC, which are the Late Silurian to Middle Devonian (～418-386 Ma) and Early Carboniferous to Late Triassic (～342-211 Ma, with three magmatic stages of Carboniferous, Permian and Triassic). Especially, the Carboniferous to Late Triassic magmatic period in the northern NCC are closely comparable with that in the IMDOB, indicating the two domains might be involved in similar tectonic processes during Late Paleozoic.
机译：Lang山地区是阿拉善地块的东北部，北部与内蒙古-大兴安造山带（IMDOB）相邻，对shan山岩体的地质年代和地球化学研究将有助于阐明岩浆作用的关系。在郎山地区与在IMDOB中一样。根据本研究和发表的论文中锆石的U-Pb年龄，Lang山地区认识到五个岩浆阶段：志留纪晚期（〜418 Ma），石炭纪（328-304 Ma），早二叠纪（294-272 Ma）。 ），二叠纪晚期（260-254 Ma）和中晚期三叠纪（245-227 Ma）。志留纪晚期的两云母花岗岩是高铝质的，其来源是古代大陆壳，表明发生了碰撞事件。早期石炭纪镁铁质岩体为亚碱性，显示出相似的亲和力，可能起源于俯冲作用修饰的大陆岩石圈地幔。二叠纪晚期的花岗闪长岩为弱钙铝质和高K钙碱性，可能源自古代大陆地壳，而二叠纪晚期的碱性辉长岩闪长岩显示出EM I状的Sr-Nd同位素特征，表明该大陆圈岩石圈地幔富集。资源。晚二叠纪花岗闪长岩是钙碱性和高铝质的，可能是古代低陆壳的部分熔融所致，而晚二叠纪的白闪石属于低钾的胆甾岩系列，其累积的成因来自丰富的地幔源，并伴有幼年的输入。地幔材料。 Lang山地区的古生代-三叠纪岩浆阶段与北部NCC的主要岩浆时期一致，即志留统晚期至中泥盆统（〜418-386 Ma）和石炭纪至三叠纪晚期（〜342-211）。 Ma，具有石炭纪，二叠纪和三叠纪的三个岩浆阶段。尤其是，北NCC的石炭纪至三叠纪晚期岩浆期与IMDOB的岩浆期具有可比性，表明这两个领域可能与古生代晚期相似的构造过程。

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  • 来源
    《Journal of Asian earth sciences》 |2015年第1期|337-351|共15页
  • 作者

    Zeng-Zhen Wang; Bao-Fu Han; Li-Xia Feng; Bo Liu;

  • 作者单位

    Key Laboratory of Orogenic Belts and Crustal Evolution of Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;

    Key Laboratory of Orogenic Belts and Crustal Evolution of Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;

    Key Laboratory of Orogenic Belts and Crustal Evolution of Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;

    Key Laboratory of Orogenic Belts and Crustal Evolution of Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    LA-ICP-MS; Geochemistry; Origins; Plutons; Paleozoic-Triassic; Western Inner Mongolia;

    机译：LA-ICP-MS;地球化学;起源;lut古生代-三叠纪;内蒙古西部;

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