Chemical evaluation of carbonized logs from Araucariaceae species: characterization of materials associated to multivariate analysis for environmental inferences




Fossil charcoal Belvedere, Fossil charcoal Faxinal, Principal component analysis, Thermogravimetric analysis, Mid-infrared


The main objective of this study was to develop a methodology to evaluate, by physical and chemical methods, artificially charred logs from three species of Araucariaceae, and compare them fossil charcoal collected in the Faxinal and Belvedere outcrops for possible paleoenvironmental inferences. The species studied were Araucaria angustifolia, Araucaria bidwillii and Araucaria columnaris. For fossil charcoal analyses we used samples from the Mina do Faxinal and samples from the Curva do Belvedere Outcrop. The carbonization process from species of Araucariaceae were Thermogravimetric Analysis (TGA) associated to the techniques of Fourier Transform Infrared Spectroscopy (FTIR) and multivariate analysis. The Principal Component Analysis (PCA) showed that it is possible to describe 90,9% of the data, grouping the samples into two main clusters. Both samples of fossil charcoal from Belvedere and Faxinal showed charring characteristics above 400ºC. Results showed that technical associations, such as TGA, FTIR and multivariate analysis may help to characterize the natural carbonization process and contribute to important paleoenvironmental and archaeological information and inferences.


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Author Biographies

Daniela Mueller Lara, State University of Rio Grande do Sul, Porto Alegre, RS, Brazil

Holds a PhD in Environment and Development from the University of Vale do Taquari (UNIVATES), a Masters in Industrial Systems and Processes and a degree in Environmental Engineering from the University of Santa Cruz do Sul (UNISC)

Dieter Uhl, Senckenberg Research Institute and Natural History Museum, Frankfurt, Hesse, Germany

Holds a PhD in Geology/Paleontology from the Universitat Tubingen (UT) and a degree in Biology from the Technische Universität Kaiserslautern (TU).

André Jasper, University of Vale do Taquari, Lajeado, RS, Brazil

Holds a PhD and Master's degree in Geosciences from the Federal University of Rio Grande do Sul (UFRGS) and a Degree in Sciences - Full Degree in Biology from the University of Vale do Rio dos Sinos (UNISINOS).

Simone Stulp, University of Vale do Taquari, Lajeado, RS, Brazil

Holds a PhD and a Master's degree in Mining, Metallurgical and Materials Engineering from the Federal University of Rio Grande do Sul (UFRGS) and a degree in Industrial Chemistry from the Federal University of Santa Maria (UFSM).


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2022-06-03 — Updated on 2022-07-20


How to Cite

Lara, D. M., Uhl, D., Jasper, A., & Stulp, S. (2022). Chemical evaluation of carbonized logs from Araucariaceae species: characterization of materials associated to multivariate analysis for environmental inferences. Ciência E Natura, 44, e22. (Original work published June 3, 2022)