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International Journal of Earth Sciences

, Volume 106, Issue 7, pp 2407–2427 | Cite as

Pseudo- and real-inverted metamorphism caused by the superposition and extrusion of a stack of nappes: a case study of the Southern Brasília Orogen, Brazil

Original Paper

Abstract

The Southern Brasília Orogen is a Neoproterozoic belt that occurs along the southernmost border of the São Francisco Craton where the Andrelândia Nappe System represents the subducted sedimentary domain and is divided into three allochthonous groups, of which the ages and P–T conditions of metamorphism are studied here. The basal unit, the Andrelândia Nappe, exhibits an inverted metamorphic pattern. The base of the structure, composed of staurolite, garnet, biotite, kyanite, quartz, and muscovite, marks the metamorphic peak, whereas at the top, the association of the metamorphic peak does not contain staurolite. The Liberdade Nappe, the middle unit, presents a normal metamorphic pattern; its base, close to the Andrelândia Nappe, shows paragneiss with evidence of in situ partial melting, and towards the top, coarse-grained staurolite schist is found. The staurolite-out and melt-in isograds are coincident and parallel to the main foliation. Thus, the shear zone that limits the nappes is syn-metamorphic, reheating the underlying Andrelândia Nappe and influencing the establishment of metamorphic inversion. This suggestion is supported by the monazite chemical ages, which indicates that the Andrelândia Nappe metamorphic peak (586 ± 15 Ma) is younger than that of the Liberdade Nappe (622.3 ± 7.6 Ma). The upper unit, the Serra da Natureza Klippe, bears a typical high-pressure granulite mineral assemblage that is composed of kyanite, garnet, K-feldspar, rutile, and leucosome, as well as a metamorphic peak at 604.5 ± 6.1 Ma. This tectonic assembly, with inverted and non-inverted metamorphic patterns and generation of klippen structures, is consistent with exhumation models and a strong indentor located in the lower continental crust.

Keywords

Brasília Orogen High-pressure granulite Inverted metamorphism Metamorphic field gradient Monazite dating Exhumation model 

Notes

Acknowledgements

This work was financially supported by the São Paulo Research Foundation-FAPESP (Grant 04/09682-8 and 13/04007-0). R. G. Motta is thankful to the National Counsel of Technological and Scientific Development-CNPq for the scholarship. The authors thank Marcos Mansueto for his help at the Microprobe Laboratory of Geosciences Institute-São Paulo University (USP) and Dr. Lucelene Martins for her help with the monazite analyses. Careful review of an earlier draft of this manuscript was conducted by Rebecca Jamieson, which greatly improved the final version.

Supplementary material

531_2016_1436_MOESM1_ESM.xlsx (12 kb)
Supplementary material 1 (XLSX 12 KB)

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© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Instituto de GeociênciasUniversidade de São PauloSão PauloBrazil

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