HR: 1340h
AN: T13D-1568 [Abstracts]
TI: Transition from rift basins to intra-cratonic basins in the Barents Sea as revealed in potential field signature and paleogeograph
AU: * Ebbing, J
EM: Joerg.Ebbing@ngu.no
AF: Geological Survey of Norway (NGU), Leiv Eirikssonsvei 39, 7491, Trondheim, Norway
AU: Werner, S C
EM: Stephanie.Werner@ngu.no
AF: Geological Survey of Norway (NGU), Leiv Eirikssonsvei 39, 7491, Trondheim, Norway
AU: Gernigon, L
EM: Laurent.Gernigon@ngu.no
AF: Geological Survey of Norway (NGU), Leiv Eirikssonsvei 39, 7491, Trondheim, Norway
AU: Koren, T
EM: Tatyana_Koren@vsegei.ru
AF: All-Russian Geological Research, Institute (VSEGEI), Srednij Prospect, 74, St. Petersburg,
199106, Russian Federation
AU: Litvinova, T
EM: Tamara_Litvinova@vsegei.ru
AF: All-Russian Geological Research, Institute (VSEGEI), Srednij Prospect, 74, St. Petersburg,
199106, Russian Federation
AU: Olesen, O
EM: Odleiv.Olesen@ngu.no
AF: Geological Survey of Norway (NGU), Leiv Eirikssonsvei 39, 7491, Trondheim, Norway
AU: Saintot, A
EM: Aline.Saintot@ngu.no
AF: Geological Survey of Norway (NGU), Leiv Eirikssonsvei 39, 7491, Trondheim, Norway
AU: Smelror, M
EM: Morten.Smelror@ngu.no
AF: Geological Survey of Norway (NGU), Leiv Eirikssonsvei 39, 7491, Trondheim, Norway
AU: Petrov, O
EM: vsegei@vsegei.ru
AF: All-Russian Geological Research, Institute (VSEGEI), Srednij Prospect, 74, St. Petersburg,
199106, Russian Federation
AU: Sobolev, N
EM: vsegei@vsegei.ru
AF: All-Russian Geological Research, Institute (VSEGEI), Srednij Prospect, 74, St. Petersburg,
199106, Russian Federation
AB:
A new compilation of potential field data and of paleogeographic maps provides a new fundament to constrain
the basin architecture and crustal pattern of the Barents Sea region. Until now, most studies of the Barents Sea
have been limited to either the Norwegian western part or the Russian eastern part of the Barents Sea. However,
the Western and Eastern Barents Sea show a large set of different features, expressed in subsidence pattern,
distribution of depocenters, basin geometry and evolution, crustal thickness as well as upper mantle structure.
While the Western Barents Sea basins are typical rift basins affected by the opening of the North Atlantic, the
Eastern Barents Sea basins show distinctive features such as large extension and wavelengths, thick sequence
of sediments and a flat Moho which are normally associated with cratonic or intracratonic basins. Detailed study
of the gravity field and the isostatic state of the Barents Sea Region indicate further that the Eastern Barents Sea
basins are underlain by high lithospheric mantle densities, an observation often made for intra-cratonic basins.
To define successful exploration models and hydrocarbon plays a good understanding of the basin evolution and
the paleogeographic settings is needed. We compile a series of paleogeographic maps from selected time
slices spanning the Early Silurian to the Eocene time interval. The paleogeographic maps help to predict the
distribution and understand the formation of the main depocenters and intrinsic sedimentary facies, which also
confirms the differences between the Eastern and Western Barents Sea.
Our results show that the transition zone between the Eastern and Western Barents Sea is of special interest for
understanding the Barents Sea geological evolution. In the gravity and magnetic fields the transition is coinciding
with a change of anomaly pattern. Especially, large-scale anomalies in the magnetic field point to the existence of
intrusions in intermediate crustal levels, which may be related to a suture zone of a possible Timanian origin.
UR: http://www.ngu.no
DE: 1219 Gravity anomalies and Earth structure (0920, 7205, 7240)
DE: 1517 Magnetic anomalies: modeling and interpretation
DE: 8038 Regional crustal structure
DE: 8103 Continental cratons
DE: 8169 Sedimentary basin processes
SC: Tectonophysics [T]
MN: 2007 Fall Meeting