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首页> 外文期刊>Journal of Asian earth sciences >Episodic Mesozoic thickening and reworking of the North China Archean lower crust correlated to the fast-spreading Pacific plate
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Episodic Mesozoic thickening and reworking of the North China Archean lower crust correlated to the fast-spreading Pacific plate

机译：华北太古宙下地壳的偶发性中生代增厚与返修与太平洋板块的快速扩散有关

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摘要

A central target in Earth sciences is to understand the processes controlling the stabilization and destruction of Archean continents. The North China craton (NCC) has in part lost its dense crustal root after the Mesozoic, and thus it is a key region to test models of crust-mantle differentiation and subsequent evolution of the continental crust. However, the timing and mechanisms responsible for its crustal thickening and reworking have been long debated. Here we report the Early Cretaceous Yinan (eastern NCC) adakitic granites, for which major/trace elemental models demonstrate that they are complementary to the analogy of the documented eclogitic relicts within the NCC. Based on their Late Archean inherited zircons, depleted mantle Nd model ages of ～2.8 Ga, large negative ε_(Nd)(t) values (-36.7 to -25.3) and strongly radiogenic initial ~(87)Sr/~(86)Sr ratios (0.7178-0.7264), we suggest that the Yinan adakitic granites were potentially formed by the dehydration melting of a thickened Archean mica-bearing mafic lower crust during the Early Cretaceous (ca. 124 Ma), corresponding to a major period (117-132 Ma) of the NCC Mesozoic intrusive magmatism. Combined previous results, it is shown that the thickening and reworking of the North China Archean lower crust occurred largely as two short-lived episodes at 155-180 Ma and 117-132 Ma, rather than a gradual, secular event. These correlated temporally with the superfast-spreading Pacific plate during the Mesozoic. The synchroneity of these events suggests rapid plate motion of the Pacific plate driving the episodic NCC crustal thickening and reworking, resulting in dense eclogitic residues that became gravitationally unstable. The onset of lithospheric delamina-tion occurred when upwelling asthenosphere heated the base of lower crust to form coeval felsic magmas with or without involvement of juvenile mantle material. Collectively, the circum-Pacific massive crustal production could be attributed to the unusually rapid motion of Pacific at 155-180 Ma and 117-132 Ma.
机译：地球科学的中心目标是了解控制太古代大陆的稳定和破坏的过程。华北克拉通（NCC）在中生代之后部分失去了致密的地壳根，因此，这是测试地幔-幔幔分化模型和随后的大陆壳演化的关键区域。但是，引起地壳增厚和返工的时机和机制长期以来一直在争论。在这里，我们报告早期白垩纪伊南（东部NCC）的adakitic花岗岩，其主要/痕量元素模型表明它们与NCC内已记录的遗遗遗物的类比是互补的。基于其晚太古代的锆石，耗尽的地幔Nd模型年龄为2.8 Ga，较大的负ε_（Nd）（t）值（-36.7至-25.3）和强放射源的初始〜（87）Sr /〜（86）Sr比率（0.7178-0.7264），我们认为伊南埃达克质花岗岩可能是由早白垩纪（约124 Ma）期间对应于一个主要时期（117- NCC中生代侵入岩浆作用（132 Ma）。结合先前的结果，表明华北太古宙下地壳的增厚和改造主要是在155-180 Ma和117-132 Ma发生了两次短暂的事件，而不是逐渐的世俗事件。这些在时间上与中生代超快扩散的太平洋板块相关。这些事件的同步性表明，太平洋板块的快速板块运动驱动了偶发的NCC地壳增厚和返工，导致致密的片状残渣变得引力不稳定。当软流圈上升流加热下部地壳的底部以形成具有或不涉及幼年地幔物质的后代长英质岩浆时，岩石圈开始分层。总体而言，环太平洋大规模地壳生产可能归因于太平洋在155-180 Ma和117-132 Ma异常快速的运动。

著录项

  • 来源
    《Journal of Asian earth sciences》 |2014年第5期|63-74|共12页
  • 作者

    Jun-Bo Zhang; Wen-Li Ling; Yong-Sheng Liu; Rui-Chun Duan; Shan Gao; Yuan-Bao Wu; Hong-Mei Yang; Xiao-Fei Qiu; Yong-Qing Zhang;

  • 作者单位

    State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Ceosciences, Wuhan 430074, China;

    State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Ceosciences, Wuhan 430074, China;

    State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Ceosciences, Wuhan 430074, China;

    Wuhan Institute of Geology and Mineral Resources, Wuhan 430205, China;

    State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Ceosciences, Wuhan 430074, China;

    State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Ceosciences, Wuhan 430074, China;

    Wuhan Institute of Geology and Mineral Resources, Wuhan 430205, China;

    Wuhan Institute of Geology and Mineral Resources, Wuhan 430205, China;

    Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China;

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  • 正文语种 eng
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  • 关键词

    Adakitic granite; Archean lower crust; Thickening; Pacific plate; Rapid spreading; North China craton;

    机译：Adakitic花岗岩;太古代的下地壳;增稠;太平洋板块;快速传播;华北克拉通;

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