Author:
Muxworthy Adrian R.,Heslop David,Michalk Daniel M.
Abstract
Abstract
The thermal fluctuation field (H
f) is central to thermoremanent acquisition models, which are key to our understanding of the reliability of palaeomagnetic data, however, H
f is poorly quantified for natural systems. We report H
f determinations for a range of basalts, made by measuring rate-dependent hysteresis. The results for the basalts were found to be generally consistent within the space of H
f versus the coercive force H
C, i.e., the “Barbier plot”, which is characterized by the empirically derived relationship; log H
f ∝ 1.3 log H
C obtained from measurements on a wide range of different magnetic materials. Although the basalts appear to occupy the correct position within the space of the Barbier plot, the relationship within the sample set, log H
f ∝ 0.54 log H
C, is different to the Barbier relationship. This difference is attributed to the original Barbier relationship being derived from a wide range of different synthetic magnetic materials, and not for variations within one material type, as well as differences in methodology in determining H
f. We consider the relationship between H
C and the activation volume, υ
act, which was found to be H
C ∝ υ ***** for our mineralogically homogeneous samples. This compares favourably with theoretical predictions, and with previous empirical estimates based on the Barbier plot, which defined the relationship as H
C ∝****.
Publisher
Springer Science and Business Media LLC
Subject
Space and Planetary Science,Geology
Cited by
5 articles.
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