The first magnetotelluric image of the lithospheric-scale geological architecture in central Svalbard, Arctic Norway

Polar research

Steffen G. Bergh¹  Yngve Birkelund²  Thomas I. Beka³  Maxim Smirnov⁴ 

[1] Department of GeologyUniversity of Tromsø, Norway, P.O. Box 6050 Langnes, NO-9037 Tromsø, Norway;Department of Physics and TechnologyUniversity of Tromsø, Norway, P.O. Box 6050 Langnes, NO-9037 Tromsø, Norway;Department of Physics and TechnologyUniversity of Tromsø, Norway, P.O. Box 6050 Langnes, NO-9037 Tromsø, NorwayCorrespondence;Oulu Mining School, Geophysics, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland

关键词: Magnetotellurics;    2D modelling;    lithosphere architecture;    geothermal;    Svalbard.;   

DOI  :  10.3402/polar.v34.26766

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

Magnetotelluric data, collected from 30 stations on Spitsbergen as part of a reconnaissance geothermal resource assessment along a profile with 0.5–3-km spacing in 0.003–1000-s period range, were used to develop a lithospheric-scale two-dimensional (2D) resistivity model, heretofore unavailable for the region. Inverting the determinant of the impedance tensor in 2D, we found the smoothest model fitting the data within a specified tolerance level. We justified the model by perturbing it, performing sensitivity analysis and re-running the inversion with a different algorithm and starting models. From our final model, we constructed a crustal-scale stratigraphic framework, using it to estimate the depth of major geological features and to locate structural deformations. The 2D resistivity model indicates a shallow low resistive (<100 Ωm) Paleozoic–Mesozoic sedimentary sequence, varying laterally in thickness (2–4 km), obstructed by a gently dipping Permian–Carboniferous succession (>1000 Ωm) east of the Bill...

【 授权许可】

CC BY-NC