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Tektoniczne znaczenie strefy Teisseyre’a-Tornquista w świetle nowych badań

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Mazur S. , Krzywiec P. , Malinowski M. , Lewandowski M. , Aleksandrowski P. , Mikołajczak M.

Przegląd Geologiczny

2017

tom Vol. 65, nr 12

1511--1520

The Teisseyre-Tornquist Zone (TTZ), a transcontinental feature evident from magnetic and gravity maps, runs obliquely across the territory of Poland from the NW to SE and for a century it has been considered a deep tectonic boundary between the Pre- cambrian East European Platform (EEP) in the NE and the so-called young Palaeozoic Platform in the SW. The results of quantitative interpretation of gravity and magnetic data, integrated with data from new reflection seismic profiles crossing the TTZ, indicate the continuation of the Precambrian basement of the EEP and its lower Palaeozoic cover toward the SW underneath the Palaeozoic Platform of southwestern Poland. They also suggest the occurrence of a crustal keel beneath the TTZ. In the broader context ofEuropean geology, these results imply the location of a hypothetical Caledonian tectonic suture, marking the site of the collision between Avalonia and Baltica, not along the TTZ, but farther SW, in northern Germany and southwest Poland. Another implication is that the extensive Permian-Mesozoic sedimentary basins of western Poland are established above the attenuated margin of the Baltica palaeocontinent.

O nowych rozwiązaniach tektonicznych w „Atlasie geologicznym Polski”

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Aleksandrowski P. , Mazur S.

Przegląd Geologiczny

2017

tom Vol. 65, nr 12

1499--1510

Authorial comprehensive comments and explanations are given to some of the interpretations applied in the tectonic part of the newly published Geological Atlas of Poland (Nawrocki, Becker, 2017) that considerably change the hitherto generally accepted concepts. It should be, however, admitted that most of those "new’" solutions were already proposed in the past by other workers as hypotheses that could not have been tested in the then state of knowledge on Poland’s deep geology and scientific tools at hand. This has now changed with abundant new data obtained with modern seismic techniques and advanced methods of potential field modelling. Using those data, we justify the reasons for, among others, a significant eastward shifting the front of the Variscan Orogen in Poland andfor the accompanying change in position of the division line between the Precambrian and Palaeozoic platforms. We also show the rationale for accepting a far-reaching southwestward extent of the East European Craton’s crystalline basement below the Palaeozoic Platform and for reinterpretation of the Teisseyre-Tornquist Zone’s nature, together with the question of early Palaeozoic terranes in the TESZ and the situation of the Caledonian foredeep at the SW margin of the East-European Craton.