Jurassic mountain building and Mesozoic-Cenozoic geodynamic evolution of the Northern Calcareous Alps as proven in the Berchtesgaden Alps (Germany)

摘要: New data from the Berchtesgaden Alps result in a reconstruction of Mesozoic-Cenozoic geodynamic history Northern Calcareous Alps. The closure western part Neotethys Ocean started late Early Jurassic and is evidenced by onset thick clay-rich sediments outer shelf area (=Hallstatt realm). Middle to early Late contraction documented migration trench-like basins formed front propagating thrust belt. Due ophiolite obduction, these propagated area, forming there Bajocian Oxfordian Hallstatt Melange, Hauptdolomit/Dachstein platform where Rofan Tauglboden Melanges were formed. separated nappe fronts structural highs. This scenario mirrors syn-orogenic erosion deposition an evolving Active basin formation thrusting ended around Oxfordian/Kimmeridgian boundary, which was followed carbonate platforms on highs prograding towards former latest Tithonian time. Underfilled remained between platforms. Rapid deepening Early/Late boundary induced extension due mountain uplift resulted reconfiguration related normal probably strike-slip faults. Erosion uplifted stack including obducted ophiolites caused final drowning demise Berriasian. remaining Cretaceous filled up with molasse siliciclastics until Aptian. Around again movements started, Eocene Miocene block rotations. These younger tectonic destroyed Triassic palaeogeography arranged modern configuration. described corresponds that Western Carpathians, Dinarides, Albanides, (1) age dating metamorphic soles prove inneroceanic (2) Kimmeridgian shallow-water top ophiolites, (3) show postorogenic character. Therefore, we correlate evolution Ocean.