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Journal Article

Electrical Resistivity Image of the South Atlantic Continental Margin Derived from On- and Offshore Magnetotelluric Data

Authors
/persons/resource/kapinosg

Kapinos,  G.
2.2 Geophysical Deep Sounding, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/uweck

Weckmann,  Ute
2.7 Near-surface Geophysics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
2.2 Geophysical Deep Sounding, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Jegen-Kulcsar,  M.
External Organizations;

/persons/resource/meqbel

Meqbel,  Naser
2.7 Near-surface Geophysics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Neska,  A.
External Organizations;

Katjiuongua,  T. T.
External Organizations;

Hoelz,  S.
External Organizations;

/persons/resource/oritter

Ritter,  O.
2.7 Near-surface Geophysics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

, 

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1415889.pdf
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Citation

Kapinos, G., Weckmann, U., Jegen-Kulcsar, M., Meqbel, N., Neska, A., Katjiuongua, T. T., Hoelz, S., Ritter, O. (2016): Electrical Resistivity Image of the South Atlantic Continental Margin Derived from On- and Offshore Magnetotelluric Data. - Geophysical Research Letters, 43, 1, 154-160.
https://doi.org/10.1002/2015GL066811


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1415889
Abstract
We present a deep electrical resistivity image from the passive continental margin in Namibia. The approximately 700 km long magnetotelluric profile follows the Walvis Ridge offshore, continues onshore across the Kaoko Mobile Belt and reaches onto the Congo Craton. Two-dimensional inversion reveals moderately resistive material offshore, atypically low for oceanic lithosphere, reaching depths of 15–20 km. Such moderate resistivities are consistent with seismic P wave velocity models, which suggest up to 35 km thick crust. The Neoproterozoic rocks of the Kaoko Mobile Belt are resistive, but NNW-striking major shear-zones are imaged as subvertical, conductive structures in the upper and middle crust. Since the geophysical imprint of the shear zones is intact, opening of the South Atlantic in the Cretaceous did not alter the middle crust. The transition into the cratonic region coincides with a deepening of the high-resistive material to depths of more than 60 km.