Study of coprolites from the Araripe sedimentary basin through FT-IR spectroscopy and x-ray diffraction

Quimica nova

Nobre, Marcos Augusto de Lima¹  Lanfredi, Silvania¹  Freire, Paulo de Tarso Cavalcante²  Sasaki, José Marcos²  Lima, Ricardo Jorge Cruz³  Saraiva, Antonio Álamo Feitosa⁴ 

[1] Universidade Estadual Paulista, Presidente Prudente, Brasil;Universidade Federal do Ceará, Fortaleza, Brasil;Universidade Federal do Maranhão, Imperatriz, Brasil;Universidade Regional do Cariri, Crato, Brasil

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

DOI  :  10.1590/S0100-40422007000800029

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Coprolites are fossilized faeces that constitutean important source of palaeobiological informations. This paper describes thecharacterization of some coprolite materials originated from the Romualdo Memberof the Santana Formation (Araripe Basin, south of Ceará State in Brazil)by means of two techniques: X-ray powder diffraction and Fourier transform infraredspectroscopy (FT-IR). This characterization allowed us to determine the maincomposition of the coprolites, of the nodulus (where the coprolites were extracted)and of the sediment (where the nodulus was found) suggesting that the materialwas produced by a carnivorous fish of the Lower Cretaceous.

【 授权许可】

CC BY