OSWALDO BAFFA
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Artigo IPEN-doc 20128 Electron spin resonance dating of megafauna from Lagoa dos Porcos, Piaui, Brazil2014 - KINOSHITA, ANGELA; MAYER, ELVER; MENDES, VINICIUS R.; FIGUEIREDO, ANA M.G.; BAFFA, OSWALDOExcavations performed at Lagoa dos Porcos site revealed a vast amount of extinct mammal fossil remains, becoming one of the richest palaeontological occurrences in the Serra da Capivara National Park region, a UNESCO World Heritage. Although anatomic and taxonomic aspects of extinct Quaternary mammals are relatively well known, chronologic information for deposits is rare. In this context, electron spin resonance (ESR) dating of megafauna samples provides important information for establishing a chronological background. This work presents the ESR dating of two teeth, one of Gomphotheriidae and other of Toxodontinae. Dose – response curves of each sample were constructed using spectra acquired with a JEOL FA-200 X-Band spectrometer resulting in equivalent dose (De) of 220+40 Gy and 39+2 Gy for Toxodontinae and Gomphotheriidae tooth, respectively. The conversion of De in age was made using ROSY ESR dating software resulting in 26+4 and 22+3 ka. These results place Lagoa dos Porcos fossil assemblage within the Late Pleistocene. These dates overlap with a period of abrupt increase in rainfall in northeast Brazil, and it is possible that this environmental change is related to the formation of this deposit.Artigo IPEN-doc 13458 Electron spin resonance-native signal in thermally treated dental tissue2003 - BACHMANN, LUCIANO; SANTOS, ADEVAILTON B. dos; BAFFA, OSWALDO; ZEZELL, DENISE M.Artigo IPEN-doc 13213 Electron spin resonance dating of human teeth from Toca da Santa shelter of Sao Raimundo Nonato, Piaui, Brazil2008 - KINOSHITA, A.; FIGUEIREDO, A.M.G.; FELICE, G.D.; LAGE, M.C.S.M.; GUIDON, N.; BAFFA, O.Artigo IPEN-doc 11623 ESR dating of an acient goat tooth from Nuoro, Sardinia, Italy2006 - BAFFA, O.; KINOSHITA, A.; FIGUEIREDO, A.M.G.; BRUNETTI, A.; GINESU, S.Artigo IPEN-doc 10394 ESR dating at K and X band of northeastern Brazilian megafauna2005 - KINOSHITA, A.; FRANCA, A.M.; ALMEIDA, J.A.C.; FIGUEIREDO, A.M.G.; NICOLUCCI, P.; GRAEFF, C.F.O.; BAFFA, O.Artigo IPEN-doc 10180 Study of paramagnetic and luminescence centers of microcline feldspar2005 - TATUMI, S.H.; KINOSHITA, A.; FUKUMOTO, M.E.; COURROL, L.C.; KASSAB, L.R.P.; BAFFA, O.; MUNITA, C.S.Artigo IPEN-doc 10257 Chemical origin of the native ESR signals in thermally treated enamel and dentin2004 - BACHMANN, L.; BAFFA, O.; GOMES, A.S.L.; ZEZELL, D.M.Artigo IPEN-doc 12303 Thermal degradation of dentin collagen evaluated with ESR, infrared and optical spectroscopy2007 - BACHMANN, L.; BAFFA, O.; ZEZELL, D.M.Artigo IPEN-doc 13214 ESR dating of teeth from northeastern brazilian megafauna2008 - KINOSHITA, ANGELA; BARRETO, ALCINA; ALVES, ROSENBERG; FIGUEIREDO, ANA M.; SARKIS, JORGE E. de S.; DIAS, MARCELO L.; BAFFA, OSWALDOArtigo IPEN-doc 17260 Electron spin resonance dating of teeth from western Brazilian megafauna - preliminary results2011 - KINOSHITA, ANGELA; JOSE, FLAVIO A.; SUNDARAM, DHARANI; PAIXÃO, JESUS da S.; SOARES, ISABELLA R.M.; FIGUEIREDO, ANA M.G.; BAFFA, OSWALDO