Palaeointensity of Proterozoic magmatic rocks from South America using the Preisach method

• Grant number: 14/19509-3
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• Start date: October 02, 2014
• End date: February 03, 2015
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geophysics
• Principal Investigator: Ricardo Ivan Ferreira da Trindade
• Grantee: Anita Di Chiara
• Supervisor: Adrian R. Muxworthy
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Institution abroad: Imperial College London, England
• Associated to the scholarship: 13/08938-8 - Precambrian paleointensity from the study of magmatic units of South America, BP.PD

Abstract

We intend to spend four months at the Imperial College of London, working with Prof. Andrian Muxworthy on the recently developed, non-heating Preisach paleointensity method on well-characterized Precambrian igneous samples from the Amazonian craton. The original project aims at recovering the palaeointensity of the geomagnetic field during the Paleo- to Mesoproterozoic (2.5-1 billion of years) for which very few data is available nowadays. We will use a well-characterized set of samples, previously studied for their paleomagnetic signal, which show thermal stability and field-tests that prove the thermoremanent character of their characteristic magnetization. Paleointensity measurements on these samples were already performed in São Paulo during the first 8 months of the project using the double-heating IZZI protocol with little success, probably due to high-temperature mineralogical alteration. The four months scholarship at Imperial College (UK) is thus a fundamental part of this ongoing research project (FAPESP 2013/08938-8), since it will provide independent data using a non-heating method recently developed by that group (Muxworthy and Heslop, 2011). The two sample collections available for this project are: 1790 Ma Avanaveiro mafic sills and dykes (northern Amazonian Craton), and 1419 Ma Nova Guarita mafic dykes (Bispo-Santos et al., 2012; 2014). (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DI CHIARA, ANITA; MUXWORTHY, ADRIAN R.; TRINDADE, RICRDO I. F.; BISPO-SANTOS, FRANKLIN; BAKER, EVELYN B.. Mesoproterozoic geomagnetic field strength from Nova Guarita mafic dykes (Amazon Craton). STUDIA GEOPHYSICA ET GEODAETICA, v. N/A, p. 22-pg., 2023-07-04. (13/08938-8, 14/19509-3)

DI CHIARA, A.; MUXWORTHY, A. R.; TRINDADE, R. I. F.; BISPO-SANTOS, F.. Paleoproterozoic Geomagnetic Field Strength From the Avanavero Mafic Sills, Amazonian Craton, Brazil. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, v. 18, n. 11, p. 3891-3903, NOV 2017. (13/08938-8, 14/19509-3, 16/06114-6)