Caracterização química e mineralógica do material inconsolidado do fundo da Lagoa da Viração, arquipélago de Fernando de Noronha, Pernambuco

Authors

  • Déborah Inês Teixeira Fávaro Instituto de Pesquisas Energéticas e Nucleares; Centro do Reator de Pesquisa; Laboratório de Análise por Ativação Neutrônica
  • Sonia Maria Barros de Oliveira Universidade de São Paulo; Instituto de Geociências; Departamento de Geologia Sedimentar e Ambiental
  • Sandra Regina Damatto Instituto de Pesquisas Energéticas e Nucleares; Centro de Metrologia das Radiações
  • Eldemar Menor Universidade Federal de Pernambuco; Departamento de Geologia
  • Alex Souza Moraes Universidade Federal de Pernambuco; Departamento de Química Fundamental
  • Barbara Paci Mazzilli Instituto de Pesquisas Energéticas e Nucleares; Centro de Metrologia das Radiações

DOI:

https://doi.org/10.5327/S1519-874X2006000200001

Keywords:

Lagoa da Viração, Fernando de Noronha, mineralogy, trace elements

Abstract

Lagoa da Viração is a small lake on Fernando de Noronha Island, located 20 meters above sea level. Two cores were collected in order to analyze the unconsolidated material at the bottom of the lagoon. This material is made up predominantely of smectite and Fe and Ti oxides. The elements As, Ba, Br, Co, Cr, Cs, Rb, Sb, Sc, Ta, Th, U, Zn and rare earth elements (Ce, Eu, La, Lu, Nd, Sm, Tb and Yb) were measured by neutron activation analysis. The trace element signature is very close to that of the surrounding rocks. Chemical and mineralogical features indicate that this material is not sediment but an in situ weathering product of the ultramafic parent rock that formed in the lagoon in a subaquatic environment.

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Published

2006-07-01

Issue

Vol. 6 No. 1 (2006)

Section

Articles

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How to Cite

Fávaro, D. I. T., Oliveira, S. M. B. de, Damatto, S. R., Menor, E., Moraes, A. S., & Mazzilli, B. P. (2006). Caracterização química e mineralógica do material inconsolidado do fundo da Lagoa da Viração, arquipélago de Fernando de Noronha, Pernambuco . Geologia USP. Série Científica, 6(1), 1-11. https://doi.org/10.5327/S1519-874X2006000200001