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Fundamental concepts about migmatites
Camadas rítmicas da Formação Irati, Permiano da Bacia do Paraná
PDF (Português (Brasil))

Keywords

Study of migmatites
Diatexites study
Metatexites study

How to Cite

AZEVEDO, Renata Augusta. Fundamental concepts about migmatites. Terræ Didatica, Campinas, SP, v. 15, p. e019001, 2019. DOI: 10.20396/td.v15i1.8653435. Disponível em: https://periodicos.sbu.unicamp.br/ojs/index.php/td/article/view/8653435. Acesso em: 17 jul. 2024.

Abstract

Migmatites are heterogeneous rocks formed by partial melting in contact areoles or inside collisional orogens, due to overlapping processes that can occur in an incomplete, diachronic way, and in which there is total or partial obliteration of stages previous to those observed. However, although complex, the study of rocks is useful to understand the formation of plutons derived from crustal melting, formation of granites in shear zones, evolution of orogens, movement of granitic magmas in regional shear zones, and the understanding of crustal differentiation. Thus, it is essential that the concepts necessary for description and interpretation be known and understood. Therefore, it is necessary to make available didactic material that complement the information already available in igneous and metamorphic petrology manuals. This article proposes to present introductory concepts for the study of migmatites.

https://doi.org/10.20396/td.v15i1.8653435
PDF (Português (Brasil))

References

Azevedo, R. A. 2016. Descrição e interpretação de migmatitos: metodologia para abordagem em campo, exemplo na Faixa Brasília Meridional. Belo Horizonte: Inst. Geoc. UFMG. 184p. (Dissert. Mestrado)

Brown, M. 1994. The generation, segregation, ascent and emplacement of granitic magma: the migmatite-to-crustally-derived granite connection in thickened orogens. Earth Sci. Rev., 36, 83-130.

Brown, M. & Solar, G. S. 1998. Shear-zone systems and melts: feedback relations and self-organization in orogenic belts. J. Struct. Geol., 20, 211-227.

Brown, M. 2008. Granites, migmatites and residual granulites: relationships and processes. In: Sawyer, E. W. & Brown, M. eds. 2008. Working with migmatites. Mineralogical Association of Canada, Short Course Series, 38: 97-144.

Brown, M. 2010. Melting of the continental crust during orogenesis: the thermal, rheological, and compositional consequences of melt transport from lower to upper continental crust. Canadian Journal Earth Science, 47: 655-694.

Deiner, J. F. & Fagereng, A. 2014. The influende of melt and melt drainage on crustal rheology during orogenesis, J. Geophys Res. Solid Earth, 119, p. 1-18.

Sawyer, E. W. 1998. Formation and evolution of granite magmas during crustal reworking: the significance of diatexites. J. Petrol. 39, p.1147-1167.

Sawyer, E. W. 2008a. Working with migmatites: nomenclature for the constituent parts. In: Sawyer, E. W. & Brown, M. eds. 2008. Working with migmatites. Mineralogical Association of Canada, Short Course Series, 38, p. 1-28.

Sawyer, E. W. 2008b. Identifying the parts of migmatites in the field. In: Sawyer, E. W. & Brown, M. eds. 2008. Working with migmatites. Mineralogical Association of Canada, Short Course Series, 38: 29-36.

Solar, G. S. & Brown, M. 2001. Petrogenesis of migmatites em Maine, USA: possible source of peraluminous leucogranito in plutons? Journal of Petrology, 42, p. 789-823.

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