Spectroscopic characterization of a fish of the cretaceous period (Araripe Basin)

Química Nova

Saraiva, Antonio Alamo Feitosa¹  Universidade Regional do Cariri, Crato, Brasil¹  Nobre, Marcos Augusto de Lima¹  Universidade Estadual Paulista, Presidente Prudente, Brasil¹  Freire, Paulo de Tarso Cavalcante¹  Universidade Regional do Cariri, Juazeiro do Norte, Brasil¹  Lima, Ricardo Jorge Cruz¹  Sasaki, José Marcos¹  Lanfredi, Silvania¹  Universidade Federal do Ceará, Fortaleza, Brasil¹ 

关键词: Fossil;    X-ray diffraction;    Fourier transform infrared spectroscopy.;   

DOI  :  10.1590/S0100-40422007000100005

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

The study of fossils has made considerable progress over the last years as a result of the use of new experimental techniques. This paper describes the chemical composition of a fossilized fish of the Cretaceous period, from a 100 million-year-old, material originated from the Araripe Basin (northeastern Brazil). The chemical composition of the fossilized fish was analyzed by means of X-ray powder diffraction and Fourier transform infrared spectroscopy (FT-IR). The spectroscopic study has proven that the main substances found in the fossilized fish are CaCO3 and Ca5(PO4)3(OH). A tentative mechanism to explain the fossilization process is also given.

【 授权许可】

Unknown