Reconstruction and comparison of P-T paths in the Andrelândia Nappe System, southern Brasília Fold Belt, MG

Authors

  • Rafael Gonçalves da Motta Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica
  • Renato de Moraes Universidade Federal do Rio de Janeiro; Instituto de Geociências; Departamento de Geologia
  • Rudolph Allard Johannes Trouw Universidade Federal do Rio de Janeiro; Instituto de Geociências; Departamento de Geologia
  • Mário da Costa Campos Neto Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica

DOI:

https://doi.org/10.5327/Z1519-874X2010000300006

Keywords:

High pressure metamorphism, Regional metamorphism, Andrelândia Nappe System, Thermobarometry

Abstract

The Andrelândia Nappe System consists of three main nappes, from bottom to top: the lower Andrelândia nappe, the middle Liberdade nappe and the upper Três Pontas-Varginha nappe and associated klippen, Pouso Alto, Aiuruoca, Carvalhos and Serra da Natureza. In the Andrelândia Nappe System, metamorphism increases from north to south and east to west, with the highest temperatures and pressures recorded in rocks of the Três Pontas-Varginha nappe and associated klippen. Samples of pelitic and mafic rocks were selected from the three nappes to determine the conditions of metamorphism using the program THERMOCALC. In this study, peak metamorphic conditions were calculated for the following samples: one sample of the Andrelândia Nappe (688 ± 35 °C and 5.63 ± 0.9 kbar), one sample of the Liberdade Nappe (648 ± 23°C and 7.41 ± 1 kbar), and three samples of the Carvalhos Klippe (845 ± 53ºC and 15.7 ± 5.2 kbar, and 847 ± 45ºC and 13.6 ± 5.8 kbar for two samples of pelitic granulites respectively, and 854 ± 71ºC and 15 ± 1.4 kbar for one sample of mafic granulite). P-T paths inferred on the basis of the observed textures are clockwise and typical of collisional belts.

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Published

2010-10-01

Issue

Vol. 10 No. 3 (2010)

Section

Articles

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How to Cite

Motta, R. G. da, Moraes, R. de, Trouw, R. A. J., & Campos Neto, M. da C. (2010). Reconstruction and comparison of P-T paths in the Andrelândia Nappe System, southern Brasília Fold Belt, MG . Geologia USP. Série Científica, 10(3), 79-96. https://doi.org/10.5327/Z1519-874X2010000300006