Advertisement

Mapping Geochemical Anomalies Through Principal Components Analysis in BIF Mines: An Approach Referring to the Bonito Mine, Northeastern Brazil

  • Helano FontelesEmail author
  • Henrique Pereira
  • Carla Rocha
  • César Veríssimo
Chapter
Part of the Advances in Science, Technology & Innovation book series (ASTI)

Abstract

Given the subtle complexity associated with the geochemical composition of iron ore deposits, a full understanding of their behavior appears to entail a well-structured geochemical database. In this context, the Principal Components Analysis (PCA) approach has been applied to map geochemical anomalies throughout an exhaustive database concerning the banded iron formation (BIF) deposit of the Bonito Mine, as sited in Rio Grande do Norte State in Northeastern Brazil. The BIF deposit is related to the Serra dos Quintos Formation, Seridó Group, considered as a Neoproterozoic metasedimentary sequence, deposited and metamorphosed during the Brasiliano-Pan African orogeny. The ore typology scheme comprises hematitic itabirites, magnetitic itabirites, martitic itabirites and amphibolitic itabirites. The PCA drawn data appear to reveal that two first principal components prove to explain almost 73% of the cloud information and, as expected, the Fe2O3 and SiO2 contents turn out to have the highest factorial loads on PC1. In addition, the geochemical anomalies, as projected on the factorial plane, appear to reveal some relevant information regarding the geological processes occurring during the iron ore formation. The qualitative correlation between Mn and P-Al2O3 contents indicate that an important sedimentary input have taken place, culminating in the development of the Bonito Mine BIF deposit.

Keywords

PCA BIF Bonito mine Iron oxide ore 

Notes

Acknowledgements

Helano Fonteles: CAPES Ph.D. funding grant n. 8887.116689/2016-00. Carla Rocha: FCT Ph.D. funding grant n. SFRH/BD/105622/2015.

References

  1. 1.
    Nascimento, R.S.C., Sial, A.N., Pimentel, M.M.: Chemostratigraphy of medium-grade marbles of the late Neoproterozoic Seridó Group, Seridó Fold Belt, Northeastern Brazil. Gondwana Res. 7(3), 731–744 (2004)CrossRefGoogle Scholar
  2. 2.
    Wold, S.: Principal components analysis. Chem. Intellig. Lab. Sys. 2, 37–52 (1987)CrossRefGoogle Scholar
  3. 3.
    Krauskopf, K.B.: Separation of manganese from iron in sedimentary processes. Geochim. Cosmochim. Acta 12, 61–84 (1957)CrossRefGoogle Scholar
  4. 4.
    Rankama, K., Sahama, T.G.: Geochemistry. In: 4th Impression. The University Chicago Press, Chicago (1960)Google Scholar
  5. 5.
    Alberède, F.: Geochemistry: An Introduction. Cambridge University Press, Cambridge (2009)CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Helano Fonteles
    • 1
    Email author
  • Henrique Pereira
    • 2
  • Carla Rocha
    • 2
  • César Veríssimo
    • 1
  1. 1.Universidade Federal do CearáFortalezaBrazil
  2. 2.Universidade de LisboaLisbonPortugal

Personalised recommendations