Journal of Thermal Analysis and Calorimetry

, Volume 93, Issue 1, pp 101–104 | Cite as

Thermal study of the fossilization processes of the extinct fishes in Araripe Geopark

  • Cheila G. Mothé
  • H. F. Mothé Filho
  • R. J. C. Lima
Article

Abstract

The study of fossil materials is very important in the geological and biological researches. They can involve ancient past, evolution or extinction of species, oil prospecting and the understanding of different areas such as: paleoclimate, paleoecology, paleogeography, in addition of climate, environmental changes and life. Araripe Geopark is located in the south area of the Ceará state in the Northeast of Brazil and it provides a general overview of the Earth’s History. In this study the vertebral column extinct fish, Cladocyclus ferox and its nodule from Santana Formation, Northeast of Brazil, calcite and apatite minerals, and vertebral column of recent fish, Opisthonema oglinum were investigated by means of thermal analysis. TG/DTG and DTA curves showed decomposition processes, suggesting water evolution, calcium carbonate and phosphate decomposition and thermal transitions indicated that fossilization processes of fish, carbonaceous material involved the fossil after its death and the organic substance was replaced by inorganic compounds.

Keywords

fish fossil thermal analysis 

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Copyright information

© Springer Science+Business Media, LLC. 2008

Authors and Affiliations

  • Cheila G. Mothé
    • 1
  • H. F. Mothé Filho
    • 2
  • R. J. C. Lima
    • 3
  1. 1.Department of Organic Processes/EQFederal University of Rio de JaneiroRio de JaneiroBrazil
  2. 2.Department of Geoscience/IAFederal University Rural of Rio de JaneiroRio de JaneiroBrazil
  3. 3.Technology Center/Federal University of MaranhãoMaranhãoBrazil

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