New evidence of the anomalously conductive mantle beneath the Tornquist-Teisseyre zone in Poland

• Autorzy: Semenov V. , Jankowski J. , Jóźwiak W.
• Języki publikacji: EN

Abstrakty

EN

In the summer of 2000, ten deep magnetotelluric soundings were carried out in northeastern Poland. These observations were organized along the 250-km profile crossing the East European Craton (EEC) and the Tornquist-Teisseyre zone (TTZ) up to the Holy Cross Mountains. These data extended by the ultralong period ones obtained at the geomagnetic observatories Minsk (at the EEC) and Belsk (at the TTZ) have allowed estimating the mantle conductivity down to 1000 km depths. The satisfactory analysis of these data has been made by means of the 1D spherical inversions in the context of the reliable conductance distributions. On the background of relatively low conductances of sediments (10-600 S) along the profile it has been revealed that the upper mantle conductivity is increasing from the EEP towards the TTZ. The main conductive property bas been detected at the asthenosphere depths of about 150-300 km beneath the TTZ. A good correlation exists between the present result and the previous one obtained beneath the parallel profile situated 150 km towards the northwest.

Słowa kluczowe

EN

electromagnetic sounding; mantle conductivity

• Wydawca: Instytut Geofizyki PAN
• Czasopismo: Acta Geophysica Polonica
• Rocznik: 2002
• Tom: Vol. 50, nr 4
• Strony: 517--526
• Opis fizyczny: Bibliogr. 28 poz.

Twórcy

autor

Semenov V.

autor

Jankowski J.

autor

Jóźwiak W.

• Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland,