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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 >Magnetic fabrics of soft-sediment folded strata within a neogene accretionary complex, the Miura group, central Japan
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Magnetic fabrics of soft-sediment folded strata within a neogene accretionary complex, the Miura group, central Japan

机译：日本中部三浦集团新近生增生复合物中软沉积物褶皱地层的磁性织物

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摘要

Anisotropy of magnetic susceptibility (AMS) on the middle Miocene-Pleistocene sedimentary sequence in the Boso and Miura Peninsulas of central Japan was used to study 18 sites in the northern tectonic setting and 37 sites in the southern setting. This sequence is associated with abundant synsedimentary deformation structures of folding and faulting generated in accretionary tectonics. AMS results in different deformation settings such as the forearc, the accretionary prism and the trench were analyzed. The shapes of the dissimilar magnetic fabrics are compared using the shape parameter (T) and the corrected anisotropy degree (P') in the so called T-P' diagrams. Our results have implied that the oblate fabric of the trench sediments can be regarded as the result of depositional and compactional processes alone. The AMS shape parameters obtained from the northern sequence (forearc) closely resemble an indication of undeformed trench sediments. In contrast, a different pattern is observed in the highly prolate-shaped AMS results of the southern sequence. The difference apparently reflects the degree of deformation in the three tectonic provinces. In order to understand the deformation mechanism of the sedimentary fabric, a detailed AMS study was made on one anticline system. An AMS evolution from an oblate fabric to a prolate fabric in the anticline system was observed. We also found that an AMS tectonic fabric occurred in the center of the anticline. Thickness correlations of the strata under study indicate that strained sediments formed in the central portion of the fold. As a consequence, one can say that this mechanism can modify the magnetic fabric from the sedimentary form to the tectonic form in a compressional regime.
机译：日本中部Boso和Miura半岛中新世-更新世中部沉积序列的磁化率各向异性（AMS）用于研究北部构造环境中的18个站点和南部构造环境中的37个站点。该序列与增生构造中产生的褶皱和断层的丰富的沉积变形结构有关。 AMS可以分析不同的变形设置，例如前臂，增生棱镜和沟槽。使用形状参数（T）和校正后的各向异性度（P'）在所谓的T-P'图中比较异种磁性织物的形状。我们的结果表明，沟槽沉积物的扁圆形织物可以看作是单独沉积和压实过程的结果。从北部层序（前臂）获得的AMS形状参数非常类似于未变形的沟槽沉积物的指示。相反，在南部序列的高度长条形的AMS结果中观察到不同的模式。差异显然反映了三个构造省份的变形程度。为了了解沉积织物的变形机理，在一个背斜系统上进行了详细的AMS研究。观察到了AMS在背斜系统中从扁形织物发展为扁形织物。我们还发现，AMS构造织物出现在背斜的中心。所研究地层的厚度相关性表明，褶皱的中央部分形成了应变沉积物。结果，可以说这种机制可以在压缩状态下将磁性纤维从沉积形式转变为构造形式。

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