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Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/25194
Título: 
Electron microprobe and Raman spectroscopic investigation of monazite from chromitites of Cedrolina (Goias State, Brazil)
Autor(es): 
Instituição: 
  • Univ Leoben
  • Universidade Estadual Paulista (UNESP)
ISSN: 
0077-7757
Resumo: 
Monazite from chromitites of Cedrolina (Goias State, Brazil) was investigated by electron microprobe and Raman spectroscopy. Monazite has been rarely encountered in chromitites. In Brazil, it was previously reported from chromitites of the Campo Formoso layered intrusion. Comparison between the two occurrences indicates similar morphology and textural characteristics, but remarkable differences in chemical composition. In both cases, monazite occurs as irregular grains (up to 200 mu m) preferentially located in the chlorite-serpentine matrix of the chromitite, more rarely included in chromite. However, the monazite from Cedrolina is characterized by higher Ce/La ratio, and Pr, Nd, Th contents, compared with the monazite from Campo Formoso. The obtained Raman spectra are very similar in the two cases, suggesting that the compositional variation of monazites and the spectral resolution of the Raman do not allow a conclusive chemical analysis with Raman spectra. Textural evidence indicates that, in both occurrences, monazite precipitation did not take place at high temperature, concomitantly with the host chromitite. In the Campo Formoso chromitites, precipitation of monazite has been related with percolation of hydrothermal, aqueous and acid fluids emanating from a granite batholith. on the contrary, the Cedrolina monazite probably formed during one of the metamorphic events that affected the area in which the host chromitite occurs.
Data de publicação: 
1-Abr-2012
Citação: 
Neues Jahrbuch Fur Mineralogie-abhandlungen. Stuttgart: E Schweizerbartsche Verlags, v. 189, n. 2, p. 207-215, 2012.
Duração: 
207-215
Publicador: 
E Schweizerbart'sche Verlags
Palavras-chaves: 
  • monazite
  • chromitite
  • Cedrolina
  • Brazil
  • Raman
  • electron microprobe
  • metamorphism
  • Pilar de Goias greenstone belt
Fonte: 
http://dx.doi.org/10.1127/0077-7757/2012/0220
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/25194
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