Physics
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996e%26psl.140...97m&link_type=abstract
Earth and Planetary Science Letters, vol. 140, Issue 1-4, pp.97-112
Physics
21
Pangaea, Paleomagnetism, Val Sabbia Sandstone, Triassic, Apparent Polar Wandering, Lombardy Italy, Elsevier: Pangaea, Paleomagnetism, Val Sabbia Sandstone, Triassic, Apparent Polar Wandering, Lombardy Italy
Scientific paper
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, 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.
Channell James E. T.
Kent Dennis V.
Muttoni Giovanni
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