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Magnetic and structural behaviour of magnetite subjected to cyclic loading under temperature conditions relevant for the upper crust

Fuchs, Helena ORCID iD icon; Reznik, Boris; Schilling, Frank R.; Kontny, Agnes

Abstract (englisch):

Magnetic properties of rocks are used to qualitatively describe the dynamics of tectonic-related deformation phenomena within the Earth’s crust. Up to now modifications of magnetic properties are mainly described from static or dynamic shock-related deformations (e.g. Reznik et al. 2016). 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 an intermediate to high-temperature tectonic loading exhibits a cyclic character. This raises the question whether the magnetic properties of rocks are sensitive to fatigue-assisted deformation under increased temperature.
In order to reveal fundamental changes in magnetite exposed to cyclic loading, samples of a banded magnetite-quartz ore were compared with samples prepared from a natural magnetite single crystal. Cyclic experiments have been carried out using a GABO Eplexor Dynamic Mechanical Analysis (DMA) system allowing controlled force loading with a precision better than 0.1 mN (Klumbach and Schilling, 2013). ... mehr

Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Poster
Publikationsdatum 03.09.2018
Sprache Englisch
Identifikator KITopen-ID: 1000105294
HGF-Programm 35.14.01 (POF III, LK 01) Effiziente Nutzung geothermisch. Energie
Veranstaltung GeoBonn (2018), Bonn, Deutschland, 02.09.2018 – 06.09.2018
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