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Combination of Raman, Infrared, and X-Ray Energy-Dispersion Spectroscopies and X-Ray Diffraction to Study a Fossilization Process

2011; Springer Science+Business Media; Volume: 41; Issue: 4-6 Linguagem: Inglês

10.1007/s13538-011-0045-y

1678-4448

Francisco Eduardo de Sousa Filho, João Hermínio da Silva, Antônio Álamo Feitosa Saraiva, Deyvid Dennys S. Brito, Bartolomeu C. Viana, Bruno Tavares de Oliveira Abagaro, Paulo Freire,

Crystal Structures and Properties

X-ray diffraction was combined with X-ray energy-dispersion, Fourier-transform infrared, and Raman spectroscopies to study the fossilization of a Cretaceous specimen of the plant Brachyphyllum castilhoi, a fossil from the Ipubi Formation, in the Araripe Sedimentary Basin, Northeastern Brazil. Among the possible fossilization processes, which could involve pyrite, silicon oxide, calcium oxide, or other minerals, we were able to single out pyritization as the central mechanism producing the fossil, more than 100 million years ago. In addition to expanding the knowledge of the Ipubi Formation, this study shows that, when combined with other experimental techniques, Raman spectroscopy is a valuable tool at the paleontologist’s disposal.