Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 2

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
w słowach kluczowych:  Gdów “embayment”
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
The Gdów “embayment” is the most pronounced deflection along the northern boundary of the Carpathians. It is filled by the sandy clay deposits which used to be named the Skawina Formation or Chodenice beds or, locally, conglomerates (of Sypka Góra). Their stratigraphic position according to studies of foraminifers had been determined as Badenian. New results obtained from micropalaeontological material sampled at three exposures near Wiatowice, Jawczyce (Giewont) and Gdów (Sypka Góra), and based on boreholes, indicate a much younger age of for the deposits infilling the Gdów “embayment”. These studies show that the surface deposits are not older than Late Sarmatian/Pannonian (Serravalian/Tortonian). They also suggest a much later time for the last stages of the thrusting of the Carpathian Mountains over the Carpathian Foredeep.
Analysis of previously available stratigraphic data coupled with the re-interpretation of seismic profiles calibrated by boreholes has allowed the construction of a new tectonic model of evolution of the Gdów “embayment” – a tectonic re-entrant located along the Carpathian front east of Kraków (southern Poland). This model shows that the main phase of localized fault-controlled subsidence took place in the Early Badenian and was associated with deposition of the locally overthickened Skawina Formation. Also, deposition of evaporites of the Wieliczka Formation seems to have been tectonically controlled by local basement faulting. Supra-evaporitic siliciclastic deposits have developed as a result of overall north-directed sediment progradation from the eroded Carpathian belt towards the Carpathian Foredeep. During the final stages of development of the Carpathian fold-and-thrust wedge the previously subsiding Gdów “embayment” area was uplifted and basement faults were reactivated either as reverse faults or as low angle thrust faults. Along the leading edge of this inverted structure a triangle zone developed, with backthrusting along the evaporitic level. As a result, overthickened evaporites, formed in local tectonically-controlled depressions within the area of the Gdów “embayment” area have been strongly folded and internally deformed.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.