伊比利亚西南近海阿尔卑斯构造反演的几何连贯断层网

IF 3.2 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Solid Earth Pub Date : 2024-01-29 DOI:10.5194/se-15-39-2024
Tiago M. Alves
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引用次数: 0

摘要

摘要。本文回顾了伊比利亚西南部大西洋边缘阿尔卑斯构造反演的构造样式和规模,该地区因历史上的地震、海啸和相关地质灾害而闻名。经过重新处理的高质量二维地震数据提供了构造断层的新图像,首次绘制了深度超过 10 千米的断层图。这些断层中共有 26 条,是阿尔卑斯构造过程中垂直抬升和水平平移(缩短)的同步裂隙结构。在区域范围内,构造的重新激活表现为:(a) 现今大陆架部分地区的隆起;(b) 大陆坡脚地层的局部褶皱和推移;(c) 重新激活的断层附近的同步隆起和后隆起序列的过度膨胀(如 "被动隆起")。这项研究首次证明,在伊比利亚西南部绘制的 26 条近海断层的生长和联系过程中,几何连贯性占主导地位;因此,这些断层很容易重新活化,形成运动学上连贯的断层网络。它们形成了 100-250 公里长的结构,其中最长的可能产生动量震级 (Mw) 为 8.0 的地震。构造反转始于晚白垩世,在岩浆侵入体附近,其震级更大。与以前的模型不同,这项研究推测中生代晚期岩浆活动较强烈的地区包括加厚、较硬的地壳,并形成西北-东南向压缩的侧向支撑。研究表明,这些结构支承促进了两个不同地区早期褶皱和推力带的发展--这是汇聚边缘的典型特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Networks of geometrically coherent faults accommodate Alpine tectonic inversion offshore southwestern Iberia
Abstract. The structural styles and magnitudes of Alpine tectonic inversion are reviewed for the Atlantic margin of southwestern (SW) Iberia, a region known for its historical earthquakes, tsunamis and associated geohazards. Reprocessed, high-quality 2D seismic data provide new images of tectonic faults, which were mapped to a depth exceeding 10 km for the first time. A total of 26 of these faults comprise syn-rift structures accommodating vertical uplift and horizontal advection (shortening) during Alpine tectonics. At the regional scale, tectonic reactivation has been marked by (a) the exhumation of parts of the present-day continental shelf, (b) local folding and thrusting of strata at the foot of the continental slope, and (c) oversteepening of syn- and post-rift sequences near reactivated faults (e.g. “passive uplift”). This work proves, for the first time, that geometric coherence dominated the growth and linkage of the 26 offshore faults mapped in SW Iberia; therefore, they are prone to reactivate as a kinematically coherent fault network. They form 100–250 km long structures, the longest of which may generate earthquakes with a momentum magnitude (Mw) of 8.0. Tectonic inversion started in the Late Cretaceous, and its magnitude is greater close to where magmatic intrusions are identified. In contrast to previous models, this work postulates that regions in which Late Mesozoic magmatism was more intense comprise thickened, harder crust and form lateral buttresses to northwest–southeast compression. It shows these structural buttresses to have promoted the development of early stage fold-and-thrust belts – typical of convergent margins – in two distinct sectors.
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来源期刊
Solid Earth
Solid Earth GEOCHEMISTRY & GEOPHYSICS-
CiteScore
6.90
自引率
8.80%
发文量
78
审稿时长
4.5 months
期刊介绍: Solid Earth (SE) is a not-for-profit journal that publishes multidisciplinary research on the composition, structure, dynamics of the Earth from the surface to the deep interior at all spatial and temporal scales. The journal invites contributions encompassing observational, experimental, and theoretical investigations in the form of short communications, research articles, method articles, review articles, and discussion and commentaries on all aspects of the solid Earth (for details see manuscript types). Being interdisciplinary in scope, SE covers the following disciplines: geochemistry, mineralogy, petrology, volcanology; geodesy and gravity; geodynamics: numerical and analogue modeling of geoprocesses; geoelectrics and electromagnetics; geomagnetism; geomorphology, morphotectonics, and paleoseismology; rock physics; seismics and seismology; critical zone science (Earth''s permeable near-surface layer); stratigraphy, sedimentology, and palaeontology; rock deformation, structural geology, and tectonics.
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