New Late Vendian palaeogeography of Baltica and the TESZ

• Autorzy: Nawrocki J. , Boguckyj A. , Katinas V.
• Języki publikacji: EN

Abstrakty

EN

New palaeomagnetic poles obtained from the Vendian tuffs and basalts of western Ukraine indicate the necessity of a substantial revision of the Late Vendian-Early Cambrian palaeogeography of the Baltic plate. The palaeopole calculated for the most stable component isolated from the Vendian tuffs and basalts is far away from the Vendian-Cambrian apparent polar wander path (APWP), constructed on the basis of Scandinavian poles but is very close to the pole recently isolated from the Vendian sediments of the White Sea Region. Depending on the polarity of the newly-determined Late Vendian pole, two palaeogeographic models of the Baltic plate in the Late Vendian-Early Cambrian are possible. In our preferred model the Baltic plate moved at that time from the moderate southern latitudes to the equator rotating anticlockwise of ca. 120 degrees Celsius. This reconstruction explains the geological structures of the marginal zones of Baltica better than the previously proposed stationary model of the Late Vendian-Cambrian Baltica. According to the new late Vendian palaeogeographic scenario, the European, passive margin of Baltica was separated from an active, Avalonian margin of Gondwana. The Late Neoproterozoic tectonic structures of the Brunovistulian Terrane and the Małopolska Block were developed near the present day southwestern corner of Baltica that was tectonically active at that time. Alternative reconstruction shows the Baltic platemoving from the moderate northern latitudes in the Vendian, crossing palaeoequator in the latest Vendian, and reaching moderate southern palaeolatitudes in the Late Cambrian. This model, however, would have required exceptionally high plate velocity (ca. 33 cm/year).

Słowa kluczowe

EN

Baltica; Małopolska; Brunovistulian; Vendian; palaeogeography; palaeomagnetism

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2004
• Tom: Vol. 48, No 4
• Strony: 309--316
• Opis fizyczny: Bibliogr. 44 poz., rys.

Twórcy

autor

Nawrocki J.

• Polish Geological Institute, Rakowiecka 4, 00-975 Warszawa, Poland

autor

Boguckyj A.

• Deptartment of Geography, Lvov University, Doroszenki 41, 290000 Lvov, Ukraine

autor

Katinas V.

• Institute of Geology and Geography, Ševčenkos St. 13, LT-2600 Vilnius, Lithuania

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