Characterization and classification of the first meteorite fall in Varre-Sai town, southeast Brazil, using X-ray microfluorescence technique
H. Alves 1*, J. Assis 2, C. Valeriano 3, C. Turbay 4
1 Federal University of Rio de Janeiro
2 Polytechnic Institute of Rio de Janeiro
3 State University of Rio de Janeiro
4 Federal University of Espirito Santo
On the night of June 19th, 2010, a meteorite fell nearby the town of Varre-Sai, Rio de Janeiro state, southeast Brazil. A small part of it was found and taken for analysis. A meteorite analysis can give researchers a better understanding of the origins of the Universe. However, some of the most traditionalist methods of characterization and classification of meteorites are destructive. In this paper we present the results of a chemical analysis and classification of this particular meteorite using X-ray microfluorescence (µXRF), a non-destructive technique that allows for a quick and easy elemental analysis within the range of micrometers. Both sides of the meteorite were measured, 35 points in total, using Artax, a state of the art µXRF system developed by Bruker, at 50kV tension and 700µA current. Quantitative analysis using Direct Comparison of Counting Rates (DCCR) method showed concentrations of iron and nickel together of roughly 7,86%. We found that it is possible to distinguish this meteorite from most of the categories as an ordinary L-type chondrite but a more thorough analysis might be necessary so as to obtain a more detailed classification.