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首页> 外文期刊>Journal of Asian earth sciences >The Late Jurassic extensional event in the Yanshan fold and thrust belt (North China): New insights from an integrated study of structural geology, geophysics, and geochemistry of the Siganding granitic pluton
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The Late Jurassic extensional event in the Yanshan fold and thrust belt (North China): New insights from an integrated study of structural geology, geophysics, and geochemistry of the Siganding granitic pluton

机译：燕山褶皱和推力皮带（华北）的黎氏侏罗纪拓地赛事：来自西方结构地质，地球物理和地球化学的综合研究的新见解

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摘要

The Yanshan fold and thrust belt (YFTB) was built up by multiple contractional events, namely the ?Yanshan Movement?, which was traditionally subdivided into the ?Yanshan-A? and ?Yanshan-B?. In contrast with the better constraint on ?Yanshan-B? (ca.140 Ma), the timing of ?Yanshan-A? is still in dispute. The Middle Jurassic contraction (172?160 Ma) was widely accepted, however, whether this contraction can last into 150 Ma is still unclear. In this article, to clarify the Late Jurassic tectonic regime in the YFTB, a multidisciplinary study, including structural geology, Anisotropy of Magnetic Susceptibility (AMS), gravity modeling, geochronology, and geochemistry, has been carried out to investigate the emplacement mechanism of the Siganding pluton (ca. 161?157 Ma) in the northern Beijing area. The magma was predominantly derived from the Precambrian continental lower crust. The magnetic foliations are pluton margin-parallel and outward dipping, resembling the fabric pattern of magmatic dome. The NE-SW striking magnetic lineations and NW-SE linear feeder zones revealed by gravity modeling indicate that the emplacement of the Siganding pluton was controlled by a weak NE-SW crustal stretching interpreted as a regional tectonic extension. Considering that the Late Jurassic (164?153 Ma) NE-SW oriented extension structures are not only documented in the YFTB, but also the entire eastern NCC, hereby we propose that the ?Yanshan-A? is constrained at 172?164 Ma, instead of a wide range from the Middle Jurassic to Late Jurassic (172?150 Ma) as argued by previous workers. The extension could be ascribed to the oblique subduction of the Izanagi plate.
机译：燕山褶皱和推力皮带（YFTB）由多个合同事件建立，即燕山运动？，传统上细分为？燕山-A？和？yanshan-b ?.与更好的限制相比，yanshan-b？ （CA.140 MA），时间的时间？燕山-A？仍然存在争议。侏罗纪收缩（172？160 mA）被广泛接受，然而，这种收缩是否可以持续到150 mA仍然不清楚。在本文中，为了澄清YFTB中的侏罗纪构造制度，已经进行了多学科研究，包括结构地质，磁性敏感性的各向异性（AMS），重力建模，地理学和地球化学，以研究展开的施加机制在北京北部地区的Siganding Pluton（CA.161？157 ma）。岩浆主要来自Precambrian Continental下皮。磁性叶子是富弦边缘平行和向外浸渍，类似于岩浆圆顶的织物图案。由重力建模显示的NE-SW引人注目的磁性基底eations和NW-SE线性馈线区域表明，Siganding钚的施加由被解释为区域构造延伸的弱Ne-SW地壳拉伸来控制。考虑到侏罗纪晚期（164？153 ma）Ne-SW定向的延伸结构不仅记录在YFTB中，而且还有整个东部的NCC，特此建议是那个？燕山-A？被限制在172年？164 mA，而不是从中间侏罗纪到晚侏罗纪（172？150 mA），如前工人所争论的那样。延伸可以归因于Izanagi板的倾斜俯冲。

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  • 来源
    《Journal of Asian earth sciences》 |2021年第15期|104708.1-104708.22|共22页
  • 作者

    Zeng Jipei; Wei Wei; Lin Wei; Meng Lingtong; Qiu Huabiao; Chu Yang; Ren Zhiheng; Wang Yin; Feng Zhentian; Li Qiuli; Ling Xiaoxiao;

  • 作者单位

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

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

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

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

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

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

    Chinese Acad Sci Innovat Acad Earth Sci Inst Geol & Geophys State Key Lab Lithospher Evolut Beijing 100029 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China|Chinese Acad Geol Sci SinoProbe Ctr Beijing 100037 Peoples R China;

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

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

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

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

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  • 正文语种 eng
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  • 关键词

    North China Craton; Yanshan fold and thrust belt; Anisotropy of Magnetic Susceptibility; Gravity modeling; Emplacement process of the Siganding pluton; Late Jurassic extension;

    机译：华北克拉顿;燕山褶皱和推力带;磁化率的各向异性;重力建模;Siganding钚的施加过程;侏罗纪延伸;

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