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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 >Polyphase faulting during the development of the west Galicia rifted margin
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Polyphase faulting during the development of the west Galicia rifted margin

机译：西加利西亚裂谷边缘发育过程中的多相断层

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Rifted margins are commonly characterised by an extension discrepancy: the amount of extension measurable from the observed faulting is far less than that required to explain the crustal thinning. It is shown here that polyphase faulting may provide a simple explanation for this paradox, but can be very hard to recognise on seismic sections. However at the west Galicia rifted margin (the Galicia Interior Basin between the Galicia Bank and the mainland, and the deep Galicia margin to the west of the Galicia Bank), a combination of high quality depth images, seismic velocity information and stratigraphic control through ODP drilling and submersible sampling, provide complementary evidence for polyphase faulting. Beniasian-Hauterivian rifting in the Galicia Interior Basin occurred along two sets of faults: the first unroofed deep crustal rocks, evidenced by high seismic velocities close to top basement; the second cut and dismembered these early faults. Further rifting (up until the Aptian) then focussed west of the Galicia Bank, where two further phases of faulting can be inferred from the diachronous nature of seismostratigraphic units tilted within fault blocks. Removal of the latest phase of faulting aligns discontinuous reflections within the fault blocks into an anastomosing network of earlier faults; restoration along these brings the crust back to its early Hauterivian state, similar to the present structure of the Interior Basin. (c) 2005 Elsevier B.V. All rights reserved.
机译：裂谷边缘通常以延伸差异为特征：从观测到的断层可测得的延伸量远远少于解释地壳变薄所需的量。此处显示，多相断层可以为这种悖论提供简单的解释，但在地震剖面上可能很难识别。但是，在西加利西亚裂谷边缘（加利西亚银行和大陆之间的加利西亚内部盆地，加利西亚银行西部的加利西亚深边缘），结合了高质量的深度图像，地震速度信息和通过ODP进行的地层控制钻井和潜水取样，为多相断层提供了补充证据。加利西亚内陆盆地的Beniasian-Hauterivian裂谷是沿着两套断层发生的：第一个没有顶棚的深地壳岩石，以靠近顶部基底的高地震速为证据;第二次削减并消除了这些早期的缺陷。进一步裂谷（直到Aptian）然后集中到加利西亚银行以西，那里的断层又可以从断层块内倾斜的地震地层单元的历时性推断出另外两个阶段。消除最新的断层阶段，将断层块内的不连续反射对准早期断层的吻合网络。沿这些区域的恢复使地壳恢复到其早期的上特夫阶状态，类似于内部盆地的当前结构。 （c）2005 Elsevier B.V.保留所有权利。

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