Electron microprobe chemical U-Th-Pb and La-ICP-MS U-Pb dating of multiple hydrothermal and metamorphic events recorded in minerals of the Lagoa Real uraniferous albitites (Brazil)

Authors

  • Alexandre O. CHAVES Universidade Federal do Espírito Santo. Alto Universitário.
  • Michael TUBRETT Micro Analysis Facility, Inco Innovation Centre, c/o Memorial University of Newfoundland.
  • Simone C. P. AVELAR Centro de Desenvolvimento da Tecnologia Nuclear.
  • Francisco J. RIOS Centro de Desenvolvimento da Tecnologia Nuclear.
  • Geraldo N. C. SGARBI Instituto de Geociências da Universidade Federal de Minas Gerais.
  • José M. C. NEVES Centro de Desenvolvimento da Tecnologia Nuclear.
  • James V. ALVES Centro de Desenvolvimento da Tecnologia Nuclear.
  • Kazuo FUZIKAWA Centro de Desenvolvimento da Tecnologia Nuclear.
  • Evandro C. MATOS Indústrias Nucleares do Brasil.
  • Sônia P. PRATES Centro de Desenvolvimento da Tecnologia Nuclear.

DOI:

https://doi.org/10.22456/1807-9806.17865

Keywords:

chemical U-Th-Pb and LA-ICP-MS U-Pb ages, uraniferous albitites, metamosphism, hydrothermalism.

Abstract

Lagoa Real uraniferous albitites are rocks which went through multiple modifications after formation. Electron microprobe chemical U-Th-Pb and LA-ICP-MS U-Pb dating of minerals of albitites reveal protolith (U-bearing sodic syenites) crystallization and isochemical metamorphism at ca. 2.0-1.9 Ga during the final stages of the Orosirian orogenic event, when the first generation of uraninites was formed. Multiple uranium and lead mobilization promoted by at least five hydrothermal events (ca. 1.7 Ga, ca. 1.5 Ga, ca. 1.3 Ga, ca. 1.1 Ga, and ca. 1.0 Ga) was detected in the albitites. A probable formation of a second uraninite group and/or resetting of UPb clock of older uraninites during the Brasiliano orogenic event at ca. 0.5 Ga also took place.

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Published

2009-08-31

How to Cite

CHAVES, A. O., TUBRETT, M., AVELAR, S. C. P., RIOS, F. J., SGARBI, G. N. C., NEVES, J. M. C., … PRATES, S. P. (2009). Electron microprobe chemical U-Th-Pb and La-ICP-MS U-Pb dating of multiple hydrothermal and metamorphic events recorded in minerals of the Lagoa Real uraniferous albitites (Brazil). Pesquisas Em Geociências, 36(2), 181–201. https://doi.org/10.22456/1807-9806.17865

Issue

Vol. 36 No. 2 (2009): Pesquisas em Geociências

Section

Articles