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| Titel |
A lithosphere-scale structural model of the Barents Sea and Kara Sea region |
| VerfasserIn |
P. Klitzke, J. I. Faleide, M. Scheck-Wenderoth, J. Sippel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 1 ; Nr. 6, no. 1 (2015-02-12), S.153-172 |
| Datensatznummer |
250115393
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| Publikation (Nr.) |
 copernicus.org/se-6-153-2015.pdf |
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| Zusammenfassung |
We introduce a regional 3-D structural model of the Barents Sea and Kara Sea
region which is the first to combine information on the sediments and the
crystalline crust as well as the configuration of the lithospheric mantle.
Therefore, we have integrated all available geological and geophysical data,
including interpreted seismic refraction and reflection data, seismological
data, geological maps and previously published 3-D models into one consistent
model. This model resolves four major megasequence boundaries (earliest
Eocene, mid-Cretaceous, mid-Jurassic and mid-Permian) the top crystalline
crust, the Moho and a newly calculated lithosphere–asthenosphere boundary
(LAB). The thickness distributions of the corresponding main megasequences
delineate five major subdomains (the northern Kara Sea, the southern Kara
Sea, the eastern Barents Sea, the western Barents Sea and the oceanic domain
comprising the Norwegian–Greenland Sea and the Eurasia Basin). Relating the
subsidence histories of these subdomains to the structure of the deeper crust
and lithosphere sheds new light on possible causative basin forming
mechanisms that we discuss.
The depth configuration of the newly calculated LAB and the seismic velocity
configuration of the upper mantle correlate with the younger history of this
region. The western Barents Sea is underlain by a thinned lithosphere
(80 km) resulting from multiple Phanerozoic rifting phases and/or
the opening of the NE Atlantic from Paleocene/Eocene times on. Notably, the
northwestern Barents Sea and Svalbard are underlain by thinnest continental
lithosphere (60 km) and a low-velocity/hot upper mantle that
correlates spatially with a region where late Cenozoic uplift was strongest.
As opposed to this, the eastern Barents Sea is underlain by a thicker
lithosphere (~ 110–150 km) and a high-velocity/density anomaly
in the lithospheric mantle. This anomaly, in turn, correlates with an area
where only little late Cenozoic uplift/erosion was observed. |
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