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Paleomagnetic evidence for a transpressional Grenville Orogen: sinistral offsets between Amazonia and Laurentia point to an evolving Rodinia
Universidade de Sao Paulo, Instituto de Geociencias.
Universidade de Sao Paulo, Instituto de Geociencias.
Geological Survey of Brazil (CPRM).
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
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2005 (English)In: EOS: Transactions, ISSN 0096-3941, E-ISSN 2324-9250, Vol. 86, no 52 Suppl, article id GP33A-0091Article in journal, Meeting abstract (Other academic) Published
Abstract [en]

We report three new paleomagnetic poles from the Amazon craton for the Meso/Neoproterozoic Grenvillian interval, a period notable for the eponymous continental collision that affected the eastern margin of Laurentia. The poles were derived from study of ca.1230 Ma mafic sills (Figueira Branca -V 40Ar/39Ar biotite), the 1149 , b7 Ma sediments of the Aguapeí Gp. (U-Pb SHRIMP analysis of authigenic xenotime) and the ca.980 Ma basaltic dykes and flat-lying flows (40Ar/39Ar biotite) that intrude and overlie the Aguapeí Gp. sediments. These new data define a skeletal apparent polar wander path marked by a counterclockwise loop, similar to that observed for North America and Baltica. A pole-by-pole comparison of the Amazon and North American data demonstrates the evolving paleogeographic affinity of these two continents, marked by the large-scale strike-slip movement of Amazonia relative to Laurentia. The 3000 km of sinistral offset between these two continents is substantiated by a 200 Ma record of sinistral transpression recorded in the 1.2-1.15 Ga deformation of basement rocks of the Amazon craton, the 1.1 Ga Nova Brasil\^{a}ndia belt, and the 1.05-1.0 Ga Sunsas belt of eastern Bolivia. Our observations suggest that transpressional collision of the Amazon craton and Laurentia was responsible for the bulk of Grenvillian deformation, as opposed to the multiple continents required by other Rodinia models.

Place, publisher, year, edition, pages
2005. Vol. 86, no 52 Suppl, article id GP33A-0091
National Category
Geophysics
Research subject
Applied Geophysics
Identifiers
URN: urn:nbn:se:ltu:diva-31320Local ID: 576e2e10-9e13-11df-a707-000ea68e967bOAI: oai:DiVA.org:ltu-31320DiVA, id: diva2:1004553
Conference
American Geophysical Union. 2005 Fall meeting : 05/12/2005 - 09/12/2005
Note

Godkänd; 2005; 20100802 (andbra)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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