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Title: Paramagnetic metamorphic mineral assemblages controlling AMS in low-grade deformed metasediments and the implications with respect to the use of AMS as a strain marker
Authors: Haerinck, Tom ×
Adriaens, Rieko
Debacker, Timothy
Hirt, Ann M.
Sintubin, Manuel #
Issue Date: 13-Mar-2013
Publisher: Geological Society Publishing House
Series Title: Journal of the Geological Society of London vol:170 issue:2 pages:263-280
Abstract: A regional analysis of the anisotropy of magnetic susceptibility (AMS) has been performed on lowgrade
metamorphic, deformed homogeneous siltstone beds (HSBs) of the Plougastel Formation in the Central
Armorican Domain together with exhaustive compositional analyses of the studied specimens. Despite sampling
a single horizon, different paramagnetic minerals are controlling the AMS in the Crozon peninsula sites
(white mica and chlorite) and in the inland sites of the Central Armorican Domain (white mica, chloritoid and
some chlorite). Both the Crozon peninsula and inland datasets show a hockey-stick shaped pattern on a plot
of the shape parameter T versus the corrected degree of anisotropy PJ, although the whole pattern is shifted to
higher PJ values for the inland dataset. High-field AMS indicates that the low-field PJ and T values from two
inland sites are slightly enhanced by a small ferromagnetic (sensu lato) contribution. Furthermore, variation
in PJ and T values within single sites can be attributed to an effect of the observed quartz/white mica ratio,
as quartz grains disrupt the petrofabric intensity. Our findings clearly demonstrate that the AMS of the HSBs
in the Central Armorican Domain is strongly influenced by compositional variations and does not merely
indicate tectonic strain, even in very similar tectonostratigraphic settings.
ISSN: 0016-7649
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Geology
Faculty of Science - miscellaneous
× corresponding author
# (joint) last author

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