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Journal of Spectroscopy
Volume 2013, Article ID 437439, 7 pages
Research Article

Spectroscopic Analysis of a Theropod Dinosaur (Reptilia, Archosauria) from the Ipubi Formation, Araripe Basin, Northeastern Brazil

1Universidade Federal do Ceará, Campus do Cariri, 63000-000 Juazeiro do Norte, CE, Brazil
2Departamento de Física, Universidade Regional do Cariri, 63100-100 Crato, CE, Brazil
3Departamento de Ciências Biológicas, Universidade Regional do Cariri, 63100-100 Crato, CE, Brazil
4Departamento de Física, Universidade Federal do Piauí, 64049-550 Teresina, PI, Brazil
5Núcleo de Biologia, Centro Acadêmico de Vitória, Universidade Federal de Pernambuco, 55608-680 Vitória de Santo Antão, PE, Brazil
6Departamento de Física, Universidade Federal do Ceará, 604455-760 Fortaleza, CE, Brazil
7Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, 63900-000 Quixadá, CE, Brazil

Received 20 June 2012; Revised 3 August 2012; Accepted 17 August 2012

Academic Editor: Kong-Thon Tsen

Copyright © 2013 João Hermínio da Silva et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The Araripe Sedimentary Basin is known by the excellence of its fossils, regarding the preservation, diversity, and quantity. Here, we present a spectroscopic analysis using several experimental techniques (X-ray energy dispersion spectroscopy, Fourier-transform infrared spectroscopy) as well as X-ray diffraction and thermogravimetric analysis applied in small fragments of bones from the posterior members of a theropod dinosaur. The results agree regarding the different composition of the stone matrix and the fossilized bone, indicating a partial substitution of the material by elements present in the depositional environment. However, differently from what is believed to occur, there is evidence that pyritization is not the only mechanism of fossilization for a specimen of Ipubi formation, but calcification, additionally, plays an important role in the fossil production of this Formation.