Volume 13 Issue 5
Sep.  2022
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Marco Aurélio Piacentini Pinheiro, George L. Guice, Joana Reis Magalhães. Archean-Ediacaran evolution of the Campos Gerais Domain-A reworked margin of the São Francisco paleocontinent (SE Brazil): Constraints from metamafic-ultramafic rocks[J]. Geoscience Frontiers, 2022, 13(5): 101201. doi: 10.1016/j.gsf.2021.101201
Citation: Marco Aurélio Piacentini Pinheiro, George L. Guice, Joana Reis Magalhães. Archean-Ediacaran evolution of the Campos Gerais Domain-A reworked margin of the São Francisco paleocontinent (SE Brazil): Constraints from metamafic-ultramafic rocks[J]. Geoscience Frontiers, 2022, 13(5): 101201. doi: 10.1016/j.gsf.2021.101201

Archean-Ediacaran evolution of the Campos Gerais Domain-A reworked margin of the São Francisco paleocontinent (SE Brazil): Constraints from metamafic-ultramafic rocks

doi: 10.1016/j.gsf.2021.101201
Funds:

o de Amparo à

Pesquisa de Minas Gerais (FAPEMIG

ã

206612/2014-1) and the Fundaç

o Motta. We would also like to thank editor Kathryn Cutts and two anonymous reviewers for their constructive comments on our manuscript.

The authors thank the Brazilian research institutions:National Council for Scientific and Technological Development (CNPq

process n°

process n°

CRA 1.058/04) for the financial assistance. The authors are also grateful to the Geological Survey of Brazil (SGB/CPRM) for the support. This paper benefited from comments from Joã

  • Received Date: 2020-09-30
  • Accepted Date: 2021-04-02
  • Rev Recd Date: 2021-03-23
  • Publish Date: 2021-04-06
  • The Campos Gerais Domain (CGD) in southeastern Brazil is an approximately 180 km×35 km area of Archean-Proterozoic rocks located southwest of the São Francisco Craton (SFC). The Archean-Paleoproterozoic evolution of the CGD-alongside its potential correlation with the SFC or other cratonic blocks in the region-is currently poorly-constrained. We present the results of systematic petrography, bulk-rock geochemistry, mineral chemistry and geochronology for a suite of scarcely studied mafic-ultramafic rocks from the CGD. We also provide a compilation of previously reported bulk-rock geochemical and spinel group mineral chemical data for mafic-ultramafic rocks throughout the CGD, and geochronological information for various lithotypes in the region. The CGD records a protracted Mesoarchean to Statherian (3.1-1.7 Ga) crustal evolution, which we interpret to share a common history with the southern SFC and their related reworked segments, suggesting that it is a westward extension of this cratonic terrain. The metavolcano-sedimentary rocks of the Fortaleza de Minas and Alpinópolis segments represent a Mesoarchean greenstone belt that is stratigraphically and chemically comparable to Archean greenstone belts worldwide, and that is broadly coeval with a local suite of tonalite-trondhjemite-granodiorite (TTG) gneisses and migmatites. U-Pb SHRIMP zircon data from a subalkaline metagabbro yielded a concordia age of ca. 2.96 Ga, revealing a previously unrecognized phase of Archean magmatism in the CGD that can be chrono-correlated with metakomatiite and TTG generation elsewhere in the São Francisco paleocontinent. Our data contradict a hypothesis whereby the metavolcano-sedimentary rocks of the Jacuí-Bom Jesus da Penha and Petúnia segments represent an ophiolite, as previously suggested, instead presenting features that point to formation in association with a continental arc. Coupled with a U-Pb (SHRIMP) crystallization age of ca. 2.13 Ga recorded by zircon grains from a metaultramafic rock, these data highlight that a magmatic event was chrono-correlated with the main accretionary phase of the Minas Orogeny, and with the Pouso Alegre/Amparo and São Vicente complexes. Finally, a U-Pb (SHRIMP) concordia age of ca. 590 Ma-obtained from metamorphic-textured zircon grains from a metaultramafic rock-points to a late metamorphic overprint related to upper amphibolite conditions, brittle fault activation and the juxtaposition of crustal blocks in association with the latest stages of western Gondwana's assembly in the southern SFC, with later retrogression to greenschist-facies.
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