Laccolithic, as opposed to cauldron subsidence, emplacement of the Eastern Mourne pluton, N. Ireland: evidence from anisotropy
of magnetic susceptibility
Carl T.E. Stevenson
William H. Owens
Donald H.W. Hutton
David N. Hood
Ian G. Meighan
10.6084/m9.figshare.3454373.v1
https://geolsoc.figshare.com/articles/dataset/Laccolithic_as_opposed_to_cauldron_subsidence_emplacement_of_the_Eastern_Mourne_pluton_N_Ireland_evidence_from_anisotropy___of_magnetic_susceptibility/3454373
<p>The structural evolution and emplacement of the Eastern Mourne pluton was investigated using anisotropy of magnetic susceptibility
(AMS) measurements (carried out on 112 oriented block samples) and structural data from the host rocks. From these new data
cauldron subsidence, as the emplacement mechanism, is disputed and evidence for an alternative, laccolithic style model involving
inflation is presented. This includes deflection and uplift of host-rock bedding close to contacts and the magnetic fabric
pattern, which has a gentle dome geometry, even close to contacts. The magnetic lineations usually plunge down-dip near the
external margins but otherwise have a general SSW–NNE trend that diverges northward. This suggests a northward-directed inflow
direction. The model for the emplacement of the Eastern Mourne pluton is a laterally fed laccolith, emplaced south to north.
The eastern margin is interpreted as a faulted contact facilitating the inflation of an asymmetrical ‘breached’ laccolith.
</p>
2016-06-21 12:04:54
cauldron subsidence
emplacement mechanism
laccolithic style model
evidence
fabric pattern
AMS
Eastern Mourne pluton
inflation
data cauldron subsidence
susceptibility
anisotropy
dome geometry
contact
host rocks
block samples
SSW
Geology