Formation of intracratonic basins by lithospheric shortening and phase changes: a case study from the ultra-deep East Barents Sea basin

Details

Serval ID
serval:BIB_F2BDBF271CF0
Type
Article: article from journal or magazin.
Collection
Publications
Title
Formation of intracratonic basins by lithospheric shortening and phase changes: a case study from the ultra-deep East Barents Sea basin
Journal
Terra Nova
Author(s)
Gac Sebastien, Huismans Ritske S., Simon Nina S. C., Podladchikov Yuri Y., Faleide Jan Inge
ISSN-L
0954-4879; 1365-3121
Publication state
Published
Issued date
2013
Volume
25
Number
6
Pages
459-464
Notes
Times Cited: 0
0
Abstract
The origin of large subsidence in intracratonic basins is still under debate. We propose a new and self-consistent model for the formation of those basins, where lithospheric shortening/buckling triggers metamorphism and densification of crustal mafic heterogeneities. We use a forward thermo-mechanical finite element technique to evaluate this mechanism for the typical example of the East Barents Sea basin (EBB) where a very large and compensated subsidence, accommodating an up to 20-km-thick sediment succession, is observed. The lower crust in the dynamic model is modelled with petrologic-consistent densities for a wet mafic gabbroic composition that depend on pressure and temperature taking into account dehydration at high PT conditions. The model successfully explains the main characteristics of the EBB, notably the large anomalous and fast subsidence during the Late Permian-Early Triassic, its present-day geometry and the absence of a significant gravity anomaly.
Create date
03/10/2015 12:34
Last modification date
20/08/2019 16:19
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