Gorceixite in the nepheline syenite of the Rio Pardo Stock, South Bahia Alkaline Province, Northeast Brazil

Authors

  • Herbet Conceição Laboratório de Petrologia Aplicada à Pesquisa Mineral – Pós-Graduação em Geociências e Análise de Bacias – Universidade Federal de Sergipe
  • Rebeca Monteiro Castro Tavares Figueiredo Laboratório de Petrologia Aplicada à Pesquisa Mineral – Universidade Federal de Sergipe
  • Jailson Junior Alves Santos Laboratório de Petrologia Aplicada à Pesquisa Mineral – Pós-Graduação em Geociências e Análise de Bacias – Universidade Federal de Sergipe
  • Maria Lourdes Silva Rosa Universidade Federal de Sergipe
  • Rita Cunha Leal Menezes Oliveira Serviço Geológico do Brasil - CPRM, Sureg Salvador

DOI:

https://doi.org/10.14808/sci.plena.2016.035301

Keywords:

Mineralogy, foid syenites, alteration

Abstract

It was identified for the first time gorceixite (BaAl3(PO4)(PO3OH)(OH)6) nepheline syenite in Stock Rio Pardo, in South Bahia Alkaline Province, which is a rare aluminous barium phosphate. This mineral occurs, with sizes below 20 μm, on the outskirts or fluoride - apatite crystals fractures. Fractures in gorceixita crystals are occupied by barite(BaSO4) and monazite[ (Ce,La,Nd)(PO4)]. The recessed contacts between the crystals and gorceixita fluorapatite was interpreted as due to delayed action of fluids and the presence of barite and monazite indicate that low-temperature solutions formed gorceixita were also responsible for the formation of these minerals.

Author Biography

Maria Lourdes Silva Rosa, Universidade Federal de Sergipe

Laboratório de Petrologia Aplicada à Pesquisa Mineral  –  Pós-Graduação em Geociências e Análise de Bacias – Universidade Federal de Sergipe

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Published

2016-03-17

How to Cite

Conceição, H., Figueiredo, R. M. C. T., Santos, J. J. A., Rosa, M. L. S., & Oliveira, R. C. L. M. (2016). Gorceixite in the nepheline syenite of the Rio Pardo Stock, South Bahia Alkaline Province, Northeast Brazil. Scientia Plena, 12(3). https://doi.org/10.14808/sci.plena.2016.035301

Issue

Vol. 12 No. 3 (2016): March/Março 2016

Section

Articles

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