气候变化领域集成服务门户(CCPortal): Subsurface characterization of quaternary scarps and their possible connection to main structures of the western margin of Precordillera, San Juan, Argentina

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DOI	10.1016/j.tecto.2020.228542
	Subsurface characterization of quaternary scarps and their possible connection to main structures of the western margin of Precordillera, San Juan, Argentina
	Peri V.G.; Rapalini A.E.; Pérez P.; Franceschinis P.; Leiva M.F.; Fazzito S.Y.; Cortés J.M.
发表日期	2020
ISSN	00401951
卷号	790
英文摘要	The El Tigre fault provides a significant example of Pliocene-Quaternary tectonic activity at the West of Precordillera, receiving considerable attention in the last years. However, longitudinal thrusts of the nearest Sierra del Tigre and a minor piedmont deformation belt identified in its western piedmont are still poorly understood. The present work comprised a detailed map of the geomorphological features of tectonic origin and Quaternary alluvial fan terraces located between the Sierra del Tigre and the El Tigre fault. Several topographic and geoelectrical profiles across minor fault and fold scarps were surveyed to define the displacement scarps, the geological structure geometries at subsurface and their relationship with main structures. Geoelectrical models allowed us to recognize three geoelectrical levels: A (> 200–300 Ω.m) correlated to Pleistocene alluvial fan terraces Q4 and Q3; B (ranging from 50 to 300/450 Ω.m), under level A and correlated to the Neogene substratum (Rodeo Formation); C (< 30–40 Ω.m) intercalated in level B, conforming aquifers (20 and 40 m deep) within the Neogene substratum. Subvertical conductive zones (10–40 Ω.m) were correlated to high angle (~60°-80°) reverse faults, which are associated with open anticlines and synclines that affect the Quaternary levels and the Neogene substratum. The structural style interpreted here allows us to conclude that the main piedmont thrust is a frontal splay of the backthrust of the Sierra del Tigre with western vergence. A better connection to the compressive deformation component, which uplifts the range, instead of to the strike-slip deformation component of the El Tigre Fault is demonstrated. This tectonic propagation probably happens during Middle-Upper Pleistocene to Holocene. The observations show that minor deformation belt is subjected to piedmont compressive movements while the El Tigre Fault absorbs the strike-slip movements, so a local partition of the deformation in the western margin of Precordillera probably happens during Quaternary. © 2020 Elsevier B.V.
关键词	Argentine Precordillera El Tigre Fault Electrical resistivity tomography Morphotectonics Neotectonics
英文关键词	Aquifers; Belts; Deformation; Hydrogeology; Landforms; Strike-slip faults; Compressive deformations; Geological structures; Main structure; Reverse faults; Strike-slip deformation; Structural styles; Subsurface characterizations; Tectonic activity; Fault slips; alluvial fan; deformation mechanism; fault scarp; faulting; fold; piedmont; Pliocene-Pleistocene boundary; Quaternary; structural geology; tectonic evolution; tectonic setting; Argentina; Precordillera; San Juan [Argentina]
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207843
作者单位	CONICET - Instituto de Ciencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Departamento de Geología, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Pabellón II, Piso 1, Ciudad Autónoma de Buenos Aires, CP1428, Argentina; Instituto de Geología y Recursos Minerales, Servicio Geológico Minero Argentino (SEGEMAR), Av. General Paz 5445, Parque Tecnológico Miguelete, Edificio 25, San Martín, Buenos Aires, B1650 WAB, Argentina; Instituto Geofísico Sismológico Volponi (IGSV), Universidad Nacional de San Juan, CONICET, Ruta 12 KM 17, Rivadavia, San Juan, J5402CWH, Argentina
推荐引用方式 GB/T 7714	Peri V.G.,Rapalini A.E.,Pérez P.,et al. Subsurface characterization of quaternary scarps and their possible connection to main structures of the western margin of Precordillera, San Juan, Argentina[J],2020,790.
APA	Peri V.G..,Rapalini A.E..,Pérez P..,Franceschinis P..,Leiva M.F..,...&Cortés J.M..(2020).Subsurface characterization of quaternary scarps and their possible connection to main structures of the western margin of Precordillera, San Juan, Argentina.Tectonophysics,790.
MLA	Peri V.G.,et al."Subsurface characterization of quaternary scarps and their possible connection to main structures of the western margin of Precordillera, San Juan, Argentina".Tectonophysics 790(2020).