New aeromagnetic and gravity compilations from Norway and adjacent areas: methods and applications
Posted on 2020-04-30 - 15:32
The Geological Survey of Norway (NGU) has produced new aeromagnetic and gravity maps from Norway and
adjacent areas, compiled from ground, airborne and satellite data. Petrophysical measurements on core samples,
hand specimens and on in situ bedrock exposures are essential for the interpretation of these
maps. Onshore, the most prominent gravity and magnetic anomalies are attributed to lower crustal rocks that have
been brought closer to the surface. The asymmetry of the gravity anomalies along the Lapland Granulite Belt and
Kongsberg–Bamble Complex, combined with the steep gradient, points to the overthrusted high-density granulites
as being the main source of the observed anomalies. The Kongsberg–Bamble anomaly can be traced southwards
through the Kattegat to southern Sweden. This concept of gravity field modelling can also be applied to the
Mid-Norwegian continental shelf and could partially explain the observed high-density rocks occurring below
the Møre and Vøring basins and in the Lofoten area. Extrapolations of Late-Caledonian detachment
structures occurring on the mainland can be traced on aeromagnetic and gravimetric images towards the NW across
the continental margin. Subcropping Late Palaeozoic to Cenozoic sedimentary units along the mid-Norwegian coast
produce a conspicuous magnetic anomaly pattern. The asymmetry of the low-amplitude anomalies, with a steep gradient
and a negative anomaly to the east and a gentler gradient to the west, relates the anomalies to gently westward
dipping strata. Recent aeromagnetic surveys in the Barents Sea have revealed negative magnetic anomalies associated
with shallow salt diapirs. Buried Quaternary channels partly filled with gravel and boulders of crystalline rocks
generate magnetic anomalies in the North Sea. The new maps also show that the opening of the
Norwegian–Greenland Sea occurred along stable continental margins without offsets across minor fracture
zones, or involving jumps in the spreading axis. A triple junction formed at 48 Ma between the Lofoten and
Norway Basins.
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Olesen, O.; Brönner, M.; Ebbing, J.; Gellein, J.; Gernigon, L.; Koziel, J.; et al. (2020). New aeromagnetic and gravity compilations from Norway and adjacent areas: methods and applications. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.4959359.v1
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AUTHORS (12)
OO
O. Olesen
MB
M. Brönner
JE
J. Ebbing
JG
J. Gellein
LG
L. Gernigon
JK
J. Koziel
TL
T. Lauritsen
RM
R. Myklebust
CP
C. Pascal
MS
M. Sand
DS
D. Solheim
SU
S. Usov
CATEGORIES
KEYWORDS
Lofoten areafracture zonesLapland Granulite BeltV øring basinsNGUlow-amplitude anomaliesLate-Caledonian detachment structuresgravity anomalies48 MaNew aeromagneticsatellite dataQuaternary channelsPetrophysical measurementsGeological SurveyNorway Basinscore samplescrustal rocksNWanomaly patternRecent aeromagnetic surveysgravity field modellingNorth SeaM ørehand specimensgravity mapsmid-Norwegian coastbedrock exposuresgravimetric imagesgravity compilationssalt diapirsBarents SeaGeology