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Paleomagnetism and petrogenesis of Paleoproterozoic units from the Uatumã event in the northern Amazonian Craton

Grant number: 13/23036-0
Support type:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): January 01, 2014
Effective date (End): December 31, 2014
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geology
Principal researcher:Manoel Souza D'Agrella Filho
Grantee:Paul Yves Jean Antonio
Supervisor abroad: Anne Nedelec
Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Research place: Université Paul Sabatier - Toulouse III, France  
Associated to the scholarship:12/20335-4 - Paleomagnetism and petrogenesis of Paleoproterozoic units from the Uatumã event in the northern Amazonian Craton, BP.DR

Abstract

The Amazonian Craton is one of the largest pieces of the Columbia "puzzle". It covers almost half the surface of Brazil and some parts of Bolivia, Colombia, Venezuela, Guyana, Suriname and French Guiana in South America. Its geological evolution is unique compared to that of other cratons in the continent, bearing more similarities with the evolution of Laurentia, Baltica, and West Africa. But despite its importance, it still exhibits, together with West Africa, one of the poorest paleomagnetic records for the Paleo- and Mesoproterozoic (D'Agrella-Filho et al., 2012; Meert and Powell, 2001; Pesonen et al., 2003). One of the most striking characteristics of the Orosirian period in the continent was the intraplate magmatism that affected mainly the central and eastern portions of the Amazonian region between 2000 Ma and 1860 Ma. This large plutonic and volcanic province was generally referred to as "Uatumã". The original extension exceeded 700,000 km2, which makes it comparable to several LIPs of the world, always intercalated with the anorogenic plutonism and, more locally and restrictedly, with some sedimentary contexts. This event may be the key to solving the paleogrography of the Amazonian Craton before the agglutination of Columbia/Nuna occurred at 1.85-1.80 Ga. In addition, thanks to the large amount of rock outcrop, the Amazonian Craton offers a unique opportunity to characterize this volcanism, associating it with its original plutonism. (AU)

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