Universität zu Köln

Cherevatova, M., Smirnov, M. Yu., Jones, A. G., Pedersen, L. B., Becken, M., Biolik, M., Cherevatova, M., Ebbing, J., Gradmann, S., Gurk, M., Huebert, J., Jones, A. G., Junge, A., Kamm, J., Korja, T., Lahti, I., Lower, A., Nittinger, C., Pedersen, L. B., Savvaidis, A. and Smirnov, M. (2015). Magnetotelluric array data analysis from north-west Fennoscandia. Tectonophysics, 653. S. 1 - 20. AMSTERDAM: ELSEVIER. ISSN 1879-3266

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Abstract

New magnetotelluric (MT) data in north-west Fennoscandia were acquired within the framework of the project Magnetotellurics in the Scandes (MaSca). The project focuses on the investigation of the crustal and upper mantle lithospheric structure in the transition zone from stable Precambrian cratonic interior to passive continental margin beneath the Caledonian orogen and the Scandinavian Mountains in western Fennoscandia. An array of 59 synchronous long period and 220 broad-band MT sites was occupied in the summers of 2011 to 2013. We estimated MT transfer functions in the period range from 0.003 to 10(5) s. The Q-function multi-site multi-frequency analysis and the phase tensor were used to estimate strike and dimensionality of MT data. Dimensionality and strike analyses indicate generally 2-D behaviour of the data with 3-D effects at some sites and period bands. In this paper we present 2-D inversion of the data, 3-D inversion models are shown in the parallel paper. We choose to invert the determinant of the impedance tensor to mitigate 3-D effects in the data on our 2-D models. Seven crustal-scale and four lithospheric-scale 2-D models are presented. The resistive regions are images of the Archaean and Proterozoic basement in the east and thin Caledonian nappes in the west. The middle and lower crust of the Svecofennian province is conductive. The southern end of the Kittila Greenstone Belt is seen in the models as a strong upper to middle crustal conductor. In the Caledonides, the highly conductive alum shales are observed along the Caledonian Thrust Front. The thickest lithosphere is in the Palaeoproterozioc Svecofennian Domain, not in the Archaean. The thickness of the lithosphere is around 200 km in the north and 300 km in the south-west. (c) 2015 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Cherevatova, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smirnov, M. Yu. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jones, A. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pedersen, L. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Becken, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Biolik, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cherevatova, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ebbing, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gradmann, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gurk, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Huebert, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jones, A. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Junge, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kamm, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Korja, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lahti, I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lower, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nittinger, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pedersen, L. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Savvaidis, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smirnov, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-401231
DOI:	10.1016/j.tecto.2014.12.023
Journal or Publication Title:	Tectonophysics
Volume:	653
Page Range:	S. 1 - 20
Date:	2015
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1879-3266
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SKELLEFTE DISTRICT; ELECTRICAL-CONDUCTIVITY; SCANDINAVIAN CALEDONIDES; TECTONIC EVOLUTION; GEOELECTRIC MODEL; IMPEDANCE TENSORS; CRUSTAL STRUCTURE; SOUTHERN NORWAY; POLAR-PROFILE; SWEDEN Multiple languages Geochemistry & Geophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/40123