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

• Grant number: 13/23036-0
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• Start date: January 01, 2014
• End date: December 31, 2014
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Manoel Souza D'Agrella Filho
• Grantee: Paul Yves Jean Antonio
• Supervisor: Anne Nedelec
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Institution abroad: 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)