变形断层沿线的盆地风格变化:墨西哥下加利福尼亚州南科罗拉多河三角洲

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS pure and applied geophysics Pub Date : 2024-09-08 DOI:10.1007/s00024-024-03561-6
Mario González-Escobar, Carlos Simón Reyes-Martínez, Cristian A. Gallegos-Castillo, Sergio M. Arregui-Ojeda, Edgar A. Mastache-Román
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引用次数: 0

摘要

科罗拉多河三角洲是由加利福尼亚湾沿岸一系列 "en-echelon "断层界定的板块交错边界的一个实例。在海湾入海口附近,Cerro Prieto 转换断层(CPF)南段和 Pangas Viejas 排状断层(PVF)勾勒出蒙塔古盆地(MB),与海湾轴线上的拉开盆地形成鲜明对比。在此背景下,我们展示了一系列地震反射剖面和已知观测数据,以说明蒙塔古盆地的地下结构。成像结果显示,CPF 和 PVF 区域内的变形集中,与主断层垂直的断层密度很高。成像结果显示,变形集中在 CPF 和 PVF 区域,这些区域的断层密度很高,与主断层垂直。与此同时,在盆地的中部,地震反射体似乎基本未发生变化,只是略有倾斜。MB 的面积约为 250 平方公里,在 CPF 以东和 PVF 以西之间的长度约为 90 公里,宽度为 30 公里。根据数据分辨率,认为盆地深度超过 5 公里。声基底仅出现在盆地西侧,深约 4 公里。其他重要观测结果包括:与 PVF 平行的 Yurimori 断层显示出基底层的显著变形,以及与 CPF 斜向西南的 Ometepec 和 La Salina 断层,它们可能是与加利福尼亚湾瓦格纳盆地的结构联系。历史地震和一个特殊的地震剖面显示,Indiviso 断层的变形发生在 El Mayor-Cucapah 地震(2010 年,Mw 7.2)之前。虽然与海湾盆地的联系尚不确定,但观察到一个向东北方向的轻微重力高点;这被解释为一个走向滑动带,表明 MB 可能成为海洋盆地和陆地盆地之间的重叠缺口。我们的研究结果为大陆盆地和大洋盆地相互作用的横断环境中的断层联系提供了各种控制。
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Basin Style Variation Along a Transform Fault: Southern Colorado River Delta, Baja California, México

The Colorado River Delta is an example of a transtensional plate boundary defined by a series of en-echelon faults along the Gulf of California. Near the gulf’s mouth, the southern segment of the Cerro Prieto transform Fault (CPF) and the listric Pangas Viejas Fault (PVF) outline Montague Basin (MB), which contrasts with the pull-apart basins along the gulf’s axis. In this context, we present a series of seismic reflection profiles and known observations to illustrate the MB subsurface architecture. The imaging findings reveal concentrated deformation within the CPF and PVF regions, which exhibit a high density of faults perpendicular to the major faults. The imaging findings reveal concentrated deformation within the CPF and PVF regions, which exhibit a high density of faults perpendicular to the major faults. At the same time, in the central part of the basin, the seismoreflectors appear largely unaltered and only slightly tilted. The MB covers an area of approximately 250 km2, with a length of around 90 km and a width of 30 km between the CPF to the east and the PVF to the west. Based on the data resolution, the basin's depth is believed to be over 5 km. The acoustic basement appears only on the west side of the basin, around 4 km deep. Other important observations include the Yurimori Fault running parallel to the PVF showing significant deformation at the basement level, as well as the Ometepec and La Salina Faults in the southwest oblique to the CPF, which could be the structural link with the Wagner Basin in the Gulf of California. Historical seismicity and one particular seismic profile indicate that deformation in the Indiviso fault occurred before the El Mayor-Cucapah earthquake (2010, Mw 7.2). Although the connection with the gulf’s basins is uncertain, a slight gravimetric high striking NE is observed; this is interpreted as a strike-slip zone, suggesting that the MB could become an overlap gap between marine and terrestrial basins. Our findings provide various controls for fault linkage in a transtensional setting in which continental and oceanic basins interact.

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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
期刊最新文献
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