Pseudo- and real-inverted metamorphism caused by the superposition and extrusion of a stack of nappes: a case study of the ... View Full Text


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Article Info

DATE

2017-01-16

AUTHORS

Rafael Gonçalves da Motta, Renato Moraes

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. More... »

PAGES

2407-2427

References to SciGraph publications

  • 2007-06-06. Diffusion-controlled biotite breakdown reaction textures at the solid/liquid transition in the continental crust in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1999-01. P -T paths from anatectic pelites in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 2004-10-01. Temperature dependence of Zr in rutile: empirical calibration of a rutile thermometer in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1989-02. A petrogenetic grid for pelitic schists in the system SiO2-Al2O3-FeO-MgO-K2O-H2O in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1988-03. Experimental determination of the fluid-absent melting relations in the pelitic system in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1967-06. The genesis of basaltic magmas in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
  • 1994-09. Partial melting of metagreywackes. Part I. Fluid-absent experiments and phase relationships in CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
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    http://scigraph.springernature.com/pub.10.1007/s00531-016-1436-7

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    http://dx.doi.org/10.1007/s00531-016-1436-7

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