Structural inheritance, morphotectonics and Holocene activity of the Cucalón-Pancrudo extensional fault (Iberian Chain, Spain)

IF 2.6 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Structural Geology Pub Date : 2024-08-22 DOI:10.1016/j.jsg.2024.105234
Alba Peiro , Luis E. Arlegui , Carlos L. Liesa , Aránzazu Luzón , Alicia Medialdea , Óscar Pueyo , Ma Asunción Soriano , José L. Simón
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Abstract

A large active extensional fault is characterized, which will contribute to improve seismic hazard assessment in an intraplate region of the Mediterranean domain whose seismic potential until today has been underestimated. The Cucalón-Pancrudo fault (CPF) is a NNW-SSE striking extensional fault that represents the negative (extensional) inversion of a previous, Late Variscan and Paleogene, transpressional fault. It is part of the Río Grío-Pancrudo fault zone, the largest active structure in the intraplate central-eastern Iberian Chain. This study focuses on characterizing the CPF structure, morphotectonics and paleoseismology. The fault offsets a well-known regional planation surface (lower level of the Fundamental Erosion Surface, FES3, 3.5 Ma), providing a basis for calculating the maximum fault throw (c. 280–300 m, including the contribution of a minor synthetic fault and a gentle accommodation monocline), and hence estimating the net slip (c. 305–325 m) and the long-term slip rate (0.09 mm/a). A trench dug in a Holocene fluvial terrace reveals an ensemble of listric, domino-style ruptures synthetic to the main fault. They were activated during at least two paleoseismic events (X, Z), 14.9 ± 1.4 ka and 6.9 ± 0.4 ka in age. An intermediate event (Y), dated to 11.0 ± 1.0 ka, as an uncertainty because the attribution of their ruptures to event Z cannot be ruled out. The total net slip accumulated during these events (1.15–1.25 m) provides an apparent short-term slip rate of 0.07–0.09 mm/a, very similar to the long-term slip rate. Nevertheless, it is very likely that the faults exposed in the surveyed trench do not represent a complete paleoseismic record. Therefore, the actual slip rate during Late Pleistocene-Holocene times could be significantly higher, approaching that reported for most of the recent extensional faults in the central Iberian Chain. The inclusion of CPF in the map of Active Faults of Iberia (QAFI database) will result in improving seismic hazard assessment in Spain.

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库卡隆-潘克鲁多伸展断层(西班牙伊比利亚链)的结构传承、形态构造和全新世活动
该研究描述了一个大型活动伸展断层的特征,这将有助于改进地中海板块内地区的地震灾害评估,该地区的地震潜力至今仍被低估。Cucalón-Pancrudo 断层(CPF)是一条北西-南西走向的伸展断层,是之前晚期瓦利斯坎时期和古新世时期转压断层的负向(伸展)反转。它是 Río Grío-Pancrudo 断层带的一部分,而 Río Grío-Pancrudo 断层带是板块内伊比利亚链中东部最大的活动构造。这项研究的重点是确定 CPF 的结构、形态构造和古地震学特征。该断层偏移了一个著名的区域平面(基本侵蚀面 FES3 的下层,3.5 Ma),为计算最大断层抛掷量(约 280-300 m,包括一个小的合成断层和一个平缓的容纳单斜)提供了依据,从而估算出净滑移量(约 305-325 m)和长期滑移率(0.09 mm/a)。在全新世河床阶地挖掘的沟槽中,发现了一系列与主断层合成的多米诺骨牌式断裂。它们至少是在两个古地震事件(X、Z)中被激活的,年代分别为 14.9 ± 1.4 ka 和 6.9 ± 0.4 ka。一个中间事件(Y)的年代为 11.0 ± 1.0 ka,是一个不确定因素,因为不能排除它们的断裂归因于 Z 事件。在这些事件中累积的总净滑移量(1.15-1.25 m)提供了一个明显的短期滑移率,即 0.07-0.09 mm/a,与长期滑移率非常相似。尽管如此,勘测坑道中暴露的断层很可能并不代表完整的古地震记录。因此,晚更新世-全新世时期的实际滑移率可能要高得多,接近伊比利亚链中部大多数近期延伸断层的滑移率。将 CPF 纳入伊比利亚活动断层图(QAFI 数据库)将有助于改善西班牙的地震灾害评估。
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来源期刊
Journal of Structural Geology
Journal of Structural Geology 地学-地球科学综合
CiteScore
6.00
自引率
19.40%
发文量
192
审稿时长
15.7 weeks
期刊介绍: The Journal of Structural Geology publishes process-oriented investigations about structural geology using appropriate combinations of analog and digital field data, seismic reflection data, satellite-derived data, geometric analysis, kinematic analysis, laboratory experiments, computer visualizations, and analogue or numerical modelling on all scales. Contributions are encouraged to draw perspectives from rheology, rock mechanics, geophysics,metamorphism, sedimentology, petroleum geology, economic geology, geodynamics, planetary geology, tectonics and neotectonics to provide a more powerful understanding of deformation processes and systems. Given the visual nature of the discipline, supplementary materials that portray the data and analysis in 3-D or quasi 3-D manners, including the use of videos, and/or graphical abstracts can significantly strengthen the impact of contributions.
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