A idade e natureza da Fonte do Granito do Moinho, Faixa Ribeira, Sudeste do Estado de São Paulo

Authors

  • Colombo Celso Gaeta Tassinari Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica
  • Marly Babinski Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica
  • Allen P. Nutman Australian National University; Research School of Earth Sciences

DOI:

https://doi.org/10.5327/S1519-874x2004000100006

Keywords:

Ribeira belt, Brasiliano cycle, granites, U-Pb geochronology

Abstract

U-Pb SHRIMP zircon ages and Sm-Nd isotopic analyses were carried out on the syn- to late tectonic Moinho Granite, intruded within the Mesoproterozoic Serra do Itaberaba Group. Six U-Pb SHRIMP analyses were undertaken on oscillatory zoned zircons. All yielded close to concordant Neoproterozoic ages, with a 206Pb/238U weighted mean age of 620 ± 11Ma, interpreted as the time of the granite crystallization. Sm-Nd isotopic analyses on samples from the Moinho Granite presented Paleoproterozoic depleted-mantle model ages between 2.0 and 1.9 Ga, and negative µNd values, indicating continental sources for the granitic magma. Previous Pb isotopic data suggest that the Mesoproterozoic Serra do Itaberaba metasedimentary sequence contributed to the magma genesis of the studied granitoid.

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Published

2004-04-01

Issue

Vol. 4 No. 1 (2004)

Section

Articles

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How to Cite

Tassinari, C. C. G., Babinski, M., & Nutman, A. P. (2004). A idade e natureza da Fonte do Granito do Moinho, Faixa Ribeira, Sudeste do Estado de São Paulo . Geologia USP. Série Científica, 4(1), 91-100. https://doi.org/10.5327/S1519-874x2004000100006