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首页> 外文期刊>Journal of structural geology >The role of structural inheritance in the development of high-displacement crustal faults in the necking domain of rifted margins: The Klakk Fault Complex, Fr0ya High, offshore mid-Norway
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The role of structural inheritance in the development of high-displacement crustal faults in the necking domain of rifted margins: The Klakk Fault Complex, Fr0ya High, offshore mid-Norway

机译：结构遗传在裂泥边缘的颈缩域中高位缩持区的发展中的作用：Klakk故障复合，Fr0ya高，挪威海上

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摘要

The role of inherited structures during the development of normal faults in continental rifts and proximal domains of passive margins have been extensively studied. Few studies, however, have a focus on deciphering the ole of inheritance in the development of high-displacement (10 km), low-angle (30 degrees) normal faults in necking domains of passive margins. We integrated and interpreted potential field, 2D and 3D reflection seismic, and well data to study the role of structural inheritance in controlling the location and development of the southern part of the Klakk Fault Complex, offshore mid-Norway. The down-to-the-west Klakk Fault Complex is an N-S non-collinear fault complex that separates the Froya High in its footwall from the Ras Basin in its hanging wall. The fault segments vary from low-angle planar to listric fault geometries in cross-section, with displacements of 17 km-34 km. These displacements led to syn-rift basement thinning of 12-14 km toward the west, which consequently, also affected the crustal wedge geometry of the necking domains. We identify three intra-acoustic-basement structures based on seismic facies and define their 3D geometry: (i) a bowl-shaped basin, (ii) a hyperbolic surface, and (iii) a domal structure. We discuss their origin and elucidate their role during later rifting. We conclude that pre-existing basement structures controlled the rift-related structures during the second rift phase (thinning), and affected the location, geometries, orientation and segmentation of the high-displacement low-angle faults in the necking domains. The results of this work offer new insights into the development of necking domains in areas where a thick continental crust (25 km) is present during rifting.
机译：广泛研究了遗传结构在陆地裂缝和近端域中发生普通故障期间的作用。然而，少数研究具有重点在于在高位移（> 10km）的开发中的遗传中解读，在被动边缘的颈域的颈域中的低角度（<30度）正常断层中。我们综合和解释了潜在的领域，2D和3D反射地震，以及研究结构遗传在控制挪威中海南部南方故障复合体南部地点和发展方面的作用。向前的Klakk故障复合体是一个N-S非相连的故障复合体，将Frooya在其悬挂墙上的RAS盆地中的脚踏壁分开。故障段因横截面的低角度平面而变化，以横截面列出故障几何形状，位移为17km-34公里。这些位移导致了朝向西部12-14公里的Syn-rift地下室变薄，因此，也影响了颈域的地壳楔形几何形状。我们识别基于地震相的三个声学基础地下室结构，并定义其3D几何形状：（i）碗状盆，（ii）一个双曲线表面，（iii）是一种多样性结构。我们讨论他们的起源并在以后徘徊期间阐明它们的作用。我们得出结论，预先存在的地下室结构在第二次裂隙阶段（细化）期间控制了裂缝相关结构，并影响了颈域中高位移低角度故障的位置，几何，方向和分段。这项工作的结果提供了新的见解，进入饲养过程中厚大陆地壳（> 25公里）的区域开发的新见解。

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