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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Strain partitioning across a subduction thrust fault near the deformation front of the Hikurangi subduction margin, New Zealand: A magnetic fabric study on IODP Expedition 375 Site U1518
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Strain partitioning across a subduction thrust fault near the deformation front of the Hikurangi subduction margin, New Zealand: A magnetic fabric study on IODP Expedition 375 Site U1518

机译：在新西兰Hikurangi俯冲边缘的变形前面的俯冲推力故障划分的应变分区：IODP探险队的磁性织物研究375位点U1518

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Understanding the distribution of strain along thrust and splay faults in active accretionary systems is crucial to understand the mechanical properties of the sediments and the strength of the fault zone and its slip behavior. This paper investigates the distribution of strain through sediment compaction and texture development across the Papaku fault, a major splay fault near the deformation front of the Hikurangi subduction margin, New Zealand using the anisotropy of magnetic susceptibility technique (AMS). International Ocean Discovery Program Site U1518 penetrated hanging wall, fault zone and footwall sequences to a maximum depth of 484.9 meters below seafloor. A total of 330 discrete samples was subjected to AMS measurements and magnetic remanence data used to reconstruct the axial orientation of each sample in a geographic reference frame. The AMS display distinct fabric differences between hanging wall, through the fault zone and footwall domains, demonstrating that strain is partitioned across the fault zone. Hanging wall sequences show a strike-parallel northeasterly lineation of K-max and weakly prolate shapes, typical for a component of northeast-southwest lateral shortening. In contrast, footwall sequences are more oblate and show a clustering of K-max in northerly direction. This demonstrates that strain in the footwall is dominated by gravitational loading, however a component of sub-horizontal east-westerly strain, parallel to the convergence direction of the Pacific Plate exists. Strain decoupling between hanging- and footwall sequences occurs near the top of the Papaku fault zone. Differences in the degree of magnetic susceptibility between footwall sediments incorporated into the fault zone, and the underlying undeformed footwall sequences are indicative for the progressive dewatering of the underconsolidated footwall sequences. (c) 2020 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
机译：了解应变沿推力和张开断层活跃增生系统中的分布是了解沉积物的机械性能和断裂带的强度和滑移性能是至关重要的。本文研究的菌株通过沉积物压实和分布在整个Papaku故障质地发展，靠近变形前的俯冲希库朗伊裕度的重大故障张开，使用磁化率技术（AMS）的各向异性新西兰。国际海洋探索项目网站U1518渗透上盘，断裂带下盘和序列的下方海底484.9米的最大深度。总共330个离散样本进行AMS测量和用于重构每个样品的轴向定向在一个地理参考帧剩磁数据。该AMS显示挂壁之间不同织物的差异，通过故​​障区和下盘结构域，这表明应变穿过断层区被划分。挂壁序列显示K-max和弱扁长形状的走向平行东北划线，典型为东北 - 西南侧起酥油的成分。与此相反，下盘序列是更扁圆，并显示K-Max在向北方向的群集。这表明在该下盘应变由重力负荷为主，子水平东 - 西风菌株然而的成分，平行于太平洋板块存在收敛方向。应变hanging-和下盘序列之间的去耦出现在接近Papaku断裂带的顶部。在掺入到断裂带下盘沉积物和底层未变形下盘序列之间磁化率的程度的差异表示为underconsolidated下盘序列的逐步脱水。 （C）2020年作者（一个或多个）。由elsevier b.v发布。这是CC的开放访问文章，许可证（http://creativecommons.org/licenses/by/4.0/）。

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