A Proterozoic Polar Wander Path for Amazonia

Details A Proterozoic Polar Wander Path for Amazonia A Proterozoic Polar Wander Path for Amazonia

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmgp44a..04t&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #GP44A-04

Mathematics

Logic

1525 Paleomagnetism Applied To Tectonics: Regional, Global, 1527 Paleomagnetism Applied To Geologic Processes, 8103 Continental Cratons, 8157 Plate Motions: Past (3040)

Scientific paper

The Amazon Craton is a key unit in Proterozoic supercontinents (Columbia, Rodinia and Gondwana), but few paleomagnetic poles were available to constraint its paleogeographic position. Here we review the paleomagnetic record for the Amazon Craton between 1800 and 520 Ma, including seven new paleomagnetic poles obtained on sedimentary, volcanic and plutonic rocks. These poles are compared to those of other cratons thought to have interacted with Amazonia in the Proterozoic, such as Baltica and Laurentia. The oldest assemblage of continents to be addressed is the Paleoproterozoic Columbia (~1800 Ma), for which our data support a configuration aligning Laurentia, Baltica and Amazonia through their Paleo-Mesoproterozoic belts. For Neoproterozoic times (~1200-1000 Ma) a connection between Laurentia and Amazonia in an evolving configuration (with sinistral movement between the two units) is supported by a pole-to-pole comparison. According to our compilation, the assembly of Gondwana has probably occurred in different steps, comprising first (~630 Ma) the connection between Sao Francisco, Rio de la Plata, other minor blocks and the African cratons, followed by the collision of these central Gondwanan blocks with the Amazon craton by mid-Cambrian times (~530 Ma), after the opening of the Iapetus ocean basin.

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