A new early Late Triassic paleopole for Adria has been obtained from the Val Sabbia Sandstone in the Southern Alps. As Early Permian and Jurassic-Cretaceous paleomagnetic data from para-autochthonous regions of Adria such as the Southern Alps are consistent with 'African' APWPs [1,2], paleomagnetic data from this region can be used to bolster the West Gondwana APWP in the poorly known Late Permian-Triassic time interval. The Southern Alpine paleopoles are integrated with the West Gondwana and Laurussia APWPs of Van der Voo  and used to generate a tectonic model for the evolution of Pangea. The Early Permian overall mean paleopole for West Gondwana and Adria, in conjunction with the coeval Laurussia paleopole, support Pangea B of Morel and Irving . The Late Permian/Early Triassic and the Middle/Late Triassic paleopoles from Adria and Laurussia support Pangea A-2 of Van der Voo and French . The phase of transcurrent motion between Laurasia and Gondwana  that caused the Pangea B to A-2 transition occurred essentially in the Permian (at the end of Variscan orogeny) with an average relative velocity of approximately 10 cm/yr. Finally, the Late Triassic/Early Jurassic paleopoles from West Gondwana and Laurussia agree with Pangea A-1 of Bullard et al. , the widely accepted Pangea configuration at the time of the Jurassic breakup.
|Titolo:||Evolution of Pangea: Paleomagnetic Constraints from the Southern Alps, Italy|
MUTTONI, GIOVANNI (Primo)
|Parole Chiave:||Apparent polar wandering; Lombardy Italy; Paleomagnetism; Pangaea; Triassic; Val Sabbia Sandstone|
|Data di pubblicazione:||1996|
|Digital Object Identifier (DOI):||10.1016/0012-821X(96)00038-6|
|Appare nelle tipologie:||01 - Articolo su periodico|