10.6084/m9.figshare.3453998.v1
David Anastasio
David
Anastasio
Josep M. Parés
Josep
M. Parés
Kenneth P. Kodama
Kenneth P.
Kodama
Joanna Troy
Joanna
Troy
Emilio L. Pueyo
Emilio
L. Pueyo
Anisotropy of magnetic susceptibility (AMS) records synsedimentary deformation kinematics at Pico del Aguila anticline, Pyrenees,
Spain
Geological Society of London
2016
Arguis synclines
diagenetic compaction fabric
susceptibility
LPS
Eocene Arguis
anisotropy
k 3
delta front mudstones
Pico del Aguila anticline
intersection lineation
depositional
clay minerals
bedding
thrust sheet
Belsu
marine clastic rocks
synsedimentary structure
k 1
k 2
records synsedimentary deformation kinematics
294 K
77 K
anhysteretic remanence show
Pyrenean thrust front
tectonic fabrics
tectonic fabric orientations
Spain Pico del Aguila anticline
growth strata geometries
diagenetic realm
AMS data record
anticline limbs
Geology
2016-06-21 11:50:04
Dataset
https://geolsoc.figshare.com/articles/dataset/Anisotropy_of_magnetic_susceptibility_AMS_records_synsedimentary_deformation_kinematics_at_Pico_del_Aguila_anticline_Pyrenees___Spain/3453998
<p>Pico del Aguila anticline is a transverse décollement fold located at the Pyrenean thrust front. The anticline is a synsedimentary
structure buried during growth by delta front mudstones and sands of the Eocene Arguis and Belsué-Atares formations. Both
the anisotropy of magnetic susceptibility measured at 77 K and 294 K and the anisotropy of anhysteretic remanence show that
susceptibility is dominated by paramagnetic clay minerals and can be used as a proxy for depositional and tectonic fabric
orientations. In general, the maximum and intermediate principal susceptibilities (<em>k</em><sub>1</sub> and <em>k</em><sub>2</sub>) of the AMS lie in bedding and the minimum principal susceptibility (<em>k</em><sub>3</sub>) is oriented nearly normal to bedding. Layer-parallel shortening (LPS) produced a <em>c.</em> north–south-trending magnetic intersection lineation in bedding on anticline limbs and in the adjacent Belsué and Arguis
synclines by deforming the depositional and diagenetic compaction fabric. The degree of magnetic anisotropy is higher along
axial surfaces than on limbs. At the anticline hinge, oblate magnetic ellipsoids with an east–west-aligned lineation and a
bedding-parallel magnetic foliation demonstrate the overprinting of the LPS magnetic fabric during the emplacement of the
underlying thrust sheet. AMS data record fold kinematics characterized by constant-length limb rotation about pinned hinges
and are compatible with kinematics recorded by growth strata geometries. This study emphasizes that AMS is a very sensitive
measure of depositional, compaction and tectonic fabrics in marine clastic rocks in the diagenetic realm.
</p>