Crustal structure of the Trans-European Suture Zone in Central Poland - reinterpretation of the LT-2, LT-4 and LT-5 deep seismic sounding profiles

• Autorzy: Grad M. , Guterch A. , Polkowska-Purys A.
• Języki publikacji: EN

Abstrakty

EN

The paper gives a reinterpretation of data from three deep seismic sounding profiles-LT-2, LT-4 and LT-5 - acquired in 1974-1979 between the Precambrian East European Craton (EEC) and the Palaeozoic Platform (PP) in Central Poland. Good quality seismic records in the distance interval from 50-90 to 200-280 km were the input data for the modelling of the crustal and uppermost mantle structure. Clear first arrivals and later phases of waves reflected/refracted from the crustal and the Moho boundaries were interpreted using a two-dimensional (2-D) ray tracing technique. In general, the crustal thickness along the three profiles varies from 30-35 km in the Palaeozoic platform area, to 42-44 km in the Polish part of the EEC, being 35-40 km in the transition zone between the PP and the EEC. In the transition area, the P-wave velocity is very low (Vp < 6.0 km/s) down to depths of 15-18 km, indicating that a very thick succession of sedimentary, metamorphosed or volcanic origin rocks is present there. All three 2-D models of the crust are discussed together with results obtained 20-30 years ago, particularly taking into account the difference in interpretation methods and new computation possibilities. Jointly with recent seismic studies along the profiles LT-7 and TTZ, as well as the POLONAISE'97 profiles P1-P4, the reinterpreted old profiles provide a collection of crustal models of the TESZ in Poland.

Słowa kluczowe

EN

TESZ; crustal structure; seismic refraction; ray tracing

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2005
• Tom: Vol. 49, No. 3
• Strony: 243--252
• Opis fizyczny: Bibliogr. 39 poz., rys., wykr.

Twórcy

autor

Grad M.

• Institute of Geophysics, University of Warsaw, Pasteura 7, PL-02-093 Warsaw, Poland

autor

Guterch A.

• Institute of Geophysics, Polish Academy of Sciences, Ks. Janusza 64, PL-01-452 Warsaw, Poland

autor

Polkowska-Purys A.

• Institute of Geophysics, University of Warsaw, Pasteura 7, PL-02-093 Warsaw, Poland

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