NDLI: Kinematic Study in the Area of the Quaternary Oblique-slip El Tigre Fault, Western Precordillera, Argentina, on the Basis of Paleomagnetism and Anisotropy of Magnetic Susceptibility

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Kinematic Study in the Area of the Quaternary Oblique-slip El Tigre Fault, Western Precordillera, Argentina, on the Basis of Paleomagnetism and Anisotropy of Magnetic Susceptibility

Content Provider	Semantic Scholar
Author	Fazzito, Sabrina Y. Rapalini, Augusto E. Cortés, José M. Terrizzano, Carla M. Valencio, Daniel A.
Copyright Year	2011
Abstract	The El Tigre fault, in the Western Precordillera of the San Juan province, Argentina, is a major Quaternary strike-slip fault that outstands for its 120 km of length, good grade of exposure and geomorphic markers of horizontal displacement, as well as for a vertical component evidenced by a remarkable high east-facing scarp with a steep slop in its central part. Despite this, there have been controversies about the geometrical and kinematic characteristics of the fault and, in general, these have not been discussed in depth. We present the use of the study of paleomagnetism and anisotropy of magnetic susceptibility (ASM) on sediments exposed on or near the fault trace, with the aim of better constraining the kinematics of this major fault. Paleomagnetic results along the fault show the presence of sections with very different amount of tectonic rotations and the presence of both clockwise and counterclockwise rotations. However, the magnitude of rotations are apparently related to the age of the sediments involved and the overall pattern can be simply modeled through a system of domino-rigid block rotations with significant drag along the main and secondary faults. AMS results showed the dominance of tectonic fabrics in the Late Tertiary and Quaternary yet unconsolidated sediments and permitted to detect a possible a regional change in the tectonic shortening direction between the Middle Pleistocene and the Upper Pleistocene, from WSE-ENE to W-E.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.geofisica.unam.mx/LatinmagLetters/LL11-0102P/B/B24-Fazzito%20et%20al-oral.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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