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The Samail subduction zone dilemma: Geochronology of high-pressure rocks from the Saih Hatat window, Oman, reveals juxtaposition of two subduction zones with contrasting thermal histories
Earth-Science Reviews ( IF 12.1 ) Pub Date : 2024-02-10 , DOI: 10.1016/j.earscirev.2024.104711
Uwe Ring , Johannes Glodny , Reuben Hansman , Andreas Scharf , Frank Mattern , Ivan Callegari , Douwe J.J. van Hinsbergen , Arne Willner , Yangbaihe Hong

The Samail Ophiolite in the Oman Mountains formed at a Cretaceous subduction zone that was part of a wider Neo-Tethys plate-boundary system. The original configuration and evolution of this plate-boundary system is hidden in a structurally and metamorphically complex nappe stack below the Samail Ophiolite. Previous work provided evidence for high-temperature metamorphism high in the nappe pile (in the metamorphic sole of the Samail Ophiolite), and high-pressure metamorphism in the deepest part of the nappe pile (Saih Hatat window), possibly reflecting a downward younging, progressive accretion history at the Samail subduction zone. However, there is evidence that the two subduction-related metamorphic events are disparate, but temporally overlapping during the mid-Cretaceous.

中文翻译:

萨迈伊俯冲带困境:阿曼 Saih Hatat 窗口的高压岩石年代学揭示了两个俯冲带的并置,具有截然不同的热历史

阿曼山脉的萨迈伊蛇绿岩形成于白垩纪俯冲带,该俯冲带是更广泛的新特提斯板块边界系统的一部分。这个板块边界系统的原始构造和演化隐藏在萨迈伊蛇绿岩下方结构和变质复杂的推覆岩堆中。先前的工作提供了推覆堆高处(萨梅尔蛇绿岩变质底)高温变质作用的证据,以及推覆堆最深处(Saih Hatat 窗口)的高压变质作用,可能反映了向下的年轻化,萨迈伊俯冲带的渐进增生历史。然而,有证据表明,这两个与俯冲相关的变质事件是不同的,但在白垩纪中期在时间上重叠。
更新日期:2024-02-10
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