Long-term shoreline shifts on continental blocks during the Bajocian: an updated interpretation based on synthetic stratigraphical and palaeogeographical developments on regional scales

• Autorzy: Ruban Dmitry A. , Sallam Emad S.

Identyfikatory

DOI

10.2478/logos-2019-0004

• Języki publikacji: EN

Abstrakty

EN

Available reconstructions of Jurassic global sea level changes differ and are in need of an update. New stratigraphical charts and palaeogeographical developments for a number of large continental blocks or their portions of these (e.g., Germany, India, northeast Africa, northwest Australia, the Russian Platform and western Siberia) reveal regional long-term shoreline shifts (i.e., transgressions and regressions) during the Bajocian Stage (168.3–170.3 Ma). A comparison of these allows to document only a single coherent feature, namely the earliest Bajocian transgression, in the majority of the continental blocks considered. Undoubtedly, this event was triggered by a eustatic rise. However, long-term shoreline shifts were either weak to absent or differed between the blocks during almost the entire Bajocian, thus providing evidence of the apparent stability of global sea level and the importance of regional tectonic activity as a control mechanism on particular transgressions and regressions. Interestingly, it appears that the earliest Bajocian eustatic rise was a constituent of a long-term eustatic pattern; the nature of this event has yet to be fully understood. Generally, the findings presented here are in better agreement with Anthony Hallam’s view of Jurassic eustasy and question some other global sea level reconstructions.

Słowa kluczowe

EN

Bajocian; eustasy; Middle Jurassic; platform; transgression

PL

bajos; jura środkowa; platforma; transgresja

• Wydawca: Uniwersytet im. Adama Mickiewicza. Instytut Geologii
• Czasopismo: Geologos
• Rocznik: 2019
• Tom: Vol. 25, No. 1
• Strony: 43--50
• Opis fizyczny: Bibliogr. 43 poz.

Twórcy

autor

Ruban Dmitry A.

• Cherepovets State University, Sovetskiy Avenue 10, Cherepovets, Vologda Region, 162600 Russia
• P.O. Box 7333, Rostov-na-Donu, 344056 Russia

autor

Sallam Emad S.

• Department of Geology, Faculty of Science, Benha University, Farid Nada Street 15, Benha 13518, Egypt

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).