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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 >A low-angle detachment fault revealed: Three-dimensional images of the S-reflector fault zone along the Galicia passive margin
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A low-angle detachment fault revealed: Three-dimensional images of the S-reflector fault zone along the Galicia passive margin

机译：低角度分离故障揭示：沿着加利西亚无源裕度的S逆向器断层区的三维图像

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摘要

A new 3-D seismic reflection volume over the Galicia margin continent-ocean transition zone provides an unprecedented view of the prominent S-reflector detachment fault that underlies the outer part of the margin. This volume images the fault's structure from breakaway to termination. The filtered time-structure map of the S-reflector shows coherent corrugations parallel to the expected paleoextension directions with an average azimuth of 107 degrees. These corrugations maintain their orientations, wavelengths and amplitudes where overlying faults sole into the S-reflector, suggesting that the parts of the detachment fault containing multiple crustal blocks may have slipped as discrete units during its late stages. Another interface above the S-reflector, here named S', is identified and interpreted as the upper boundary of the fault zone associated with the detachment fault. This layer, named the S-interval, thickens by tens of meters from SE to NW in the direction of transport. Localized thick accumulations also occur near overlying fault intersections, suggesting either non-uniform fault rock production, or redistribution of fault rock during slip. These observations have important implications for understanding how detachment faults form and evolve over time. 3-D seismic reflection imaging has enabled unique insights into fault slip history, fault rock production and redistribution. (C) 2018 Elsevier B.V. All rights reserved.
机译：Galicia边缘大陆 - 海洋过渡区的新的3-D地震反射量提供了前所未有的突出的S-反射器分离故障，使边缘的外部底层底层。此卷图像将故障的结构从分离到终止。 S-反射器的过滤时间结构图表示平行于预期的古展示方向的相干波纹，平均方位角为107度。这些波纹维持其取向，波长和幅度，其中覆盖过滤到S反射器中的覆盖物覆盖，表明含有多个地壳块的分离故障的部分可能在其后期的离散单元中被滑动。在这里，在这里命名为S'的另一个接口被识别并被解释为与分离错误相关的故障区域的上边界。该层，命名为S间隔，从SE到NW沿运输方向增厚。局部厚累积也发生在覆盖故障交叉附近，表明在滑动期间的逆均匀的故障岩石生产或重新分配故障岩石。这些观察结果对了解拆卸故障形式和随着时间的推移而发展的重要意义。 3-D地震反射成像使独特的见解是故障滑动历史，故障岩石生产和再分配。 （c）2018年elestvier b.v.保留所有权利。

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