The crustal structure in the transition zone between the western and eastern Barents Sea
| Autor: | Jan Inge Faleide, Alexey Shulgin, Hans Thybo, Tore Høy, Ernst R. Flueh, Rolf Mjelde |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
geography
Rift geography.geographical_feature_category 010504 meteorology & atmospheric sciences Continental shelf Refraction seismology Seismic modelling Structural basin Crustal structure 010502 geochemistry & geophysics 01 natural sciences Devonian Paleontology Geophysics Geochemistry and Petrology Transition zone Baltic Shield Sedimentary rock East European Craton Geology 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Journal International |
| ISSN: | 0956-540X |
| Popis: | We present a crustal-scale seismic profile in the Barents Sea based on new data. Wide-angle seismic data were recorded along a 600 km long profile at 38 ocean bottom seismometer and 52 onshore station locations. The modelling uses the joint refraction/reflection tomography approach where co-located multichannel seismic reflection data constrain the sedimentary structure. Further, forward gravity modelling is based on the seismic model.We also calculate net regional erosion based on the calculated shallow velocity structure. Our model reveals a complex crustal structure of the Baltic Shield to Barents shelf transition zone, as well as strong structural variability on the shelf itself.We document large volumes of pre-Carboniferous sedimentary strata in the transition zone which reach a total thickness of 10 km. A high-velocity crustal domain found below the Varanger Peninsula likely represents an independent crustal block. Large lower crustal bodies with very high velocity and density below the Varanger Peninsula and the Fedynsky High are interpreted as underplated material that may have fed mafic dykes in the Devonian. We speculate that these lower crustal bodies are linked to the Devonian rifting processes in the East European Craton, or belonging to the integral part of the Timanides, as observed onshore in the Pechora Basin. This article has been accepted for publication in Geophys. J. Int. ©:2018. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
| Databáze: | OpenAIRE |
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