The focus of this study is the nature of a prominent, high-velocity
(S-wave) anomaly in the upper mantle below the Barents Sea-Kara Sea
region and its relation to the evolution of the sedimentary basins,
in particular the Permo-Triassic East Barents Sea Basin. The high-velocity
anomaly exhibits a thickness of 75-100 km below the central Barents
Sea and thickens considerably below the East Barents Sea Basin (150
km). The thickest part of the high-velocity anomaly follows the outline
of the East Barents Sea Basin which is bended around Pai-Khoi-Novaya
Zemlya Fold Belt. Density modeling of the lithosphere along a 3200
km long transect from the Barents Sea to the West Siberian Basin
was used to evaluate different models for the upper mantle structure.
The best fit gravity model was achieved when either assuming a 1D,
horizontally-layered mantle structure, or, a forward-modeled density
structure using an average Proterozoic mantle composition. The first
model requires a further, compensating excess mass below the (seismic)
Moho in the East Barents Sea Basin region. The latter model exhibits
a higher-density dome structure below the basin. Both models indicate
probable old, continental lithosphere below the central part of the
transect in eastern Barents Sea/Kara Sea region. Calculated temperatures
of 400-1000 C (60-200 km depth) further support this concept. Hence,
the East Barents Sea Basin developed probably as an intra-continental
basin within a non-extensional setting. Such basins exhibit generally
crustal inhomogeneities which contributed considerably to their subsidence
history. Likely structures below the East Barents Sea Basin are Pre-Permian
rifts, accumulated melts derived by the Siberian mantle plume, and/or
the Late Neoproterozoic Timanide Orogen.
%0 Journal Article
%1 ritzmann_faleide:2009
%A Ritzmann, Oliver
%A Faleide, Jan I.
%D 2009
%J Tectonophysics
%K geophysics
%N 1-2
%P 89--104
%R 10.1016/j.tecto.2008.06.018
%T The crust and mantle lithosphere in the Barents Sea/Kara Sea region
%U http://dx.doi.org/10.1016/j.tecto.2008.06.018
%V 470
%X The focus of this study is the nature of a prominent, high-velocity
(S-wave) anomaly in the upper mantle below the Barents Sea-Kara Sea
region and its relation to the evolution of the sedimentary basins,
in particular the Permo-Triassic East Barents Sea Basin. The high-velocity
anomaly exhibits a thickness of 75-100 km below the central Barents
Sea and thickens considerably below the East Barents Sea Basin (150
km). The thickest part of the high-velocity anomaly follows the outline
of the East Barents Sea Basin which is bended around Pai-Khoi-Novaya
Zemlya Fold Belt. Density modeling of the lithosphere along a 3200
km long transect from the Barents Sea to the West Siberian Basin
was used to evaluate different models for the upper mantle structure.
The best fit gravity model was achieved when either assuming a 1D,
horizontally-layered mantle structure, or, a forward-modeled density
structure using an average Proterozoic mantle composition. The first
model requires a further, compensating excess mass below the (seismic)
Moho in the East Barents Sea Basin region. The latter model exhibits
a higher-density dome structure below the basin. Both models indicate
probable old, continental lithosphere below the central part of the
transect in eastern Barents Sea/Kara Sea region. Calculated temperatures
of 400-1000 C (60-200 km depth) further support this concept. Hence,
the East Barents Sea Basin developed probably as an intra-continental
basin within a non-extensional setting. Such basins exhibit generally
crustal inhomogeneities which contributed considerably to their subsidence
history. Likely structures below the East Barents Sea Basin are Pre-Permian
rifts, accumulated melts derived by the Siberian mantle plume, and/or
the Late Neoproterozoic Timanide Orogen.
@article{ritzmann_faleide:2009,
abstract = {The focus of this study is the nature of a prominent, high-velocity
(S-wave) anomaly in the upper mantle below the Barents Sea-Kara Sea
region and its relation to the evolution of the sedimentary basins,
in particular the Permo-Triassic East Barents Sea Basin. The high-velocity
anomaly exhibits a thickness of 75-100 km below the central Barents
Sea and thickens considerably below the East Barents Sea Basin (150
km). The thickest part of the high-velocity anomaly follows the outline
of the East Barents Sea Basin which is bended around Pai-Khoi-Novaya
Zemlya Fold Belt. Density modeling of the lithosphere along a 3200
km long transect from the Barents Sea to the West Siberian Basin
was used to evaluate different models for the upper mantle structure.
The best fit gravity model was achieved when either assuming a 1D,
horizontally-layered mantle structure, or, a forward-modeled density
structure using an average Proterozoic mantle composition. The first
model requires a further, compensating excess mass below the (seismic)
Moho in the East Barents Sea Basin region. The latter model exhibits
a higher-density dome structure below the basin. Both models indicate
probable old, continental lithosphere below the central part of the
transect in eastern Barents Sea/Kara Sea region. Calculated temperatures
of 400-1000 C (60-200 km depth) further support this concept. Hence,
the East Barents Sea Basin developed probably as an intra-continental
basin within a non-extensional setting. Such basins exhibit generally
crustal inhomogeneities which contributed considerably to their subsidence
history. Likely structures below the East Barents Sea Basin are Pre-Permian
rifts, accumulated melts derived by the Siberian mantle plume, and/or
the Late Neoproterozoic Timanide Orogen.},
added-at = {2012-09-01T13:08:21.000+0200},
author = {Ritzmann, Oliver and Faleide, Jan I.},
biburl = {https://www.bibsonomy.org/bibtex/26869a90dd479b5a155b2cc2cfbcdb88d/nilsma},
day = 17,
doi = {10.1016/j.tecto.2008.06.018},
interhash = {51fa133a6090528228de4f074b571867},
intrahash = {6869a90dd479b5a155b2cc2cfbcdb88d},
issn = {00401951},
journal = {Tectonophysics},
keywords = {geophysics},
month = may,
number = {1-2},
pages = {89--104},
timestamp = {2021-02-09T13:27:55.000+0100},
title = {The crust and mantle lithosphere in the Barents Sea/Kara Sea region},
url = {http://dx.doi.org/10.1016/j.tecto.2008.06.018},
volume = 470,
year = 2009
}