Geochemical evidence for the formation of soils by interaction between guano and volcanic rocks, Rata Island, Fernando de Noronha (Pernambuco)

Authors

  • Sonia Maria Barros de Oliveira Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica
  • Luiz Carlos Ruiz Pessenda Universidade de São Paulo; Escola Superior de Agricultura Luiz de Queiroz; Centro de Energia Nuclear na Agricultura
  • Suzy Eli Marques Gouveia Universidade de São Paulo; Escola Superior de Agricultura Luiz de Queiroz; Centro de Energia Nuclear na Agricultura
  • Deborah Inês Teixeira Fávaro Instituto de Pesquisas Energéticas e Nucleares; Comissão Nacional de Energia Nuclear; Centro de Reator de Pesquisa
  • Marly Babinski Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica

DOI:

https://doi.org/10.5327/Z1519-874x2009000300001

Keywords:

Phosphatic soils, Guano, Fernando de Noronha, Rata island, Crandallite

Abstract

The phosphatic soils found in the northern part of the Rata island, in the Fernando de Noronha Archipelago, were formed by reaction of bird guano with weathered mafic rocks of the Quixaba Formation. Phosphate minerals identified include crandallite as a major constituent. The unique guano signature preserved in soil is characterized by high levels of Cu, Pb, Zn, As, U, and Sr. On the other hand, the inheritance of the geochemical signature of the nepheline-basalts is demonstrated by the anomalous concentrations of Ba, Nb, Ta, Cr, Hf, V and Zr in soils, and by the remarkable similarity between REE patterns in rock and soils.

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Published

2009-10-01

Issue

Vol. 9 No. 3 (2009)

Section

Articles

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How to Cite

Oliveira, S. M. B. de, Pessenda, L. C. R., Gouveia, S. E. M., Fávaro, D. I. T., & Babinski, M. (2009). Geochemical evidence for the formation of soils by interaction between guano and volcanic rocks, Rata Island, Fernando de Noronha (Pernambuco) . Geologia USP. Série Científica, 9(3), 03-12. https://doi.org/10.5327/Z1519-874x2009000300001