Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.t31d0869t&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #T31D-0869
Physics
1035 Geochronology, 8102 Continental Contractional Orogenic Belts
Scientific paper
The tectonic history of the Amazon craton plays an essential role in the amalgamation of the Rodinia supercontinent, with many postulating a position of the Amazon along the eastern margin of Laurentia. Recognition of a two-stage Grenvillian history of the SW margin of the Amazon craton is based on recently obtained U-Pb, 40Ar/39Ar, and Rb-Sr data that demonstrate at least two discrete metamorphic and deformational events during end Mesoproterozoic times. The record of the younger ca. 1.09 Ga event is preserved almost exclusively in the metasediments of the E-W trending Nova Brasilandia belt, whereas the older ca. 1.18 Ga event is recorded entirely in the polydeformed basement rocks of the Amazon craton to the N. We interpret the Nova Brasilandia belt to record the accretion of the Paragua craton to the Amazon craton in the final stages of the construction of Rodinia. We report new 40Ar/39Ar data from the Paragua craton that record the original igneous age distributions of 1.35 - 1.55 Ga. These data are interpreted to reflect the rigid behavior of the Paragua craton in the Rodinia framework, suggesting that accretion of this cratonic block took place largely through strike-slip motion. We propose a Cordilleran-type margin for the Grenville collision between the nuclei of North and South America, a scenario that allowS for the polychronous tectonic evolution observed in the North American Grenville province and the emplacement of exotic terranes.
Geraldes Mauro C.
Tohver Eric
van der Pluijm Ben
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