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Magnetic signatures of rock deformation

Kontny, Agnes; Reznik, Boris; Walter, Mario; Fuchs, Helena; Schilling, Frank R.

Abstract (englisch):
Magnetic properties of rocks are pressure-sensitive and frequently used for revealing the dynamics of tectonic-related deformation phenomena within the Earth’s crust [1]. Among different magnetic methods, the anisotropy of magnetic susceptibility (AMS) is a well-established method in petrofabric analyses. In metamorphic rocks, AMS can be pronounced and magnetic lineations and foliations are the result of plastic deformation under directional static stress [2]. A serious modification of magnetic properties occurs during hypervelocity impacts. Magnetic and microstructural studies have shown that e.g. a decrease in magnetic susceptibility is mainly related to a shock-induced refinement of magnetic domains in a cooperative process of brittle and ductile deformation mechanisms [3]. Up to now, modification of magnetic properties are mainly reported from static or dynamic shock-related deformation experiments. However, it is generally accepted that tectonic stress accumulates non-uniformly, but remains quite low until a rapid stress variation occurs shortly before and after earthquake propagation or volcano eruption. Rapid stress increase may be especially favorable if tectonic loading exhibits a cyclic or fatigue character. ... mehr

Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Institut für Angewandte Materialien - Werkstoff- und Biomechanik (IAM-WBM)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Vortrag
Publikationsdatum 24.09.2019
Sprache Englisch
Identifikator KITopen-ID: 1000105293
HGF-Programm 35.14.01 (POF III, LK 01) Effiziente Nutzung geothermisch. Energie
Veranstaltung GeoMünster (2019), Münster, Deutschland, 22.09.2019 – 25.09.2019
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