Evolution of the 3.65-2.58 Ga Mairi Gneiss Complex, Brazil: Implications for growth of the continental crust in the S&#227;o Francisco Craton

Igor de Camargo Moreira; Elson Paiva Oliveira; Daniel Francisco Martins de Sousa

doi:10.1016/j.gsf.2022.101366

Volume 13 Issue 5

Sep. 2022

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Igor de Camargo Moreira, Elson Paiva Oliveira, Daniel Francisco Martins de Sousa. Evolution of the 3.65-2.58 Ga Mairi Gneiss Complex, Brazil: Implications for growth of the continental crust in the São Francisco Craton[J]. Geoscience Frontiers, 2022, 13(5): 101366. doi: 10.1016/j.gsf.2022.101366

Citation:

Igor de Camargo Moreira, Elson Paiva Oliveira, Daniel Francisco Martins de Sousa. Evolution of the 3.65-2.58 Ga Mairi Gneiss Complex, Brazil: Implications for growth of the continental crust in the São Francisco Craton[J]. Geoscience Frontiers, 2022, 13(5): 101366. doi: 10.1016/j.gsf.2022.101366

Citation:

Igor de Camargo Moreira, Elson Paiva Oliveira, Daniel Francisco Martins de Sousa. Evolution of the 3.65-2.58 Ga Mairi Gneiss Complex, Brazil: Implications for growth of the continental crust in the São Francisco Craton[J]. Geoscience Frontiers, 2022, 13(5): 101366. doi: 10.1016/j.gsf.2022.101366

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Evolution of the 3.65-2.58 Ga Mairi Gneiss Complex, Brazil: Implications for growth of the continental crust in the São Francisco Craton

doi: 10.1016/j.gsf.2022.101366

Institute of Geosciences, University of Campinas (UNICAMP), Campinas, SP, Brazil

Funds:

dia Gomes are also acknowledged for suggestions and assistance in revising an earlier draft of the manuscript.

rica Tonetto, Cristiano Lana, and Stefano Zincone for supporting the analytical analysis. Felipe Holanda dos Santos and Ná

gico (CNPq) Grant (#305099/2019-1 to EPO), the Institute of Geosciences of the University of Campinas and by the Coordenaç

o de Amparo à

This research was funded by the Fundaç

o de Aperfeiç

oamento de Pessoal de Ní

Pesquisa do Estado de Sã

o Paulo (FAPESP) Grant (#2012/15824-6 and #2018/25465-0 to EPO), the Conselho Nacional de Desenvolvimento Cientí

fico e Tecnoló

vel Superior (CAPES) PhD Scholarship (#001) to the senior author. We would like to thank guest editors Kathryn Cutts, Hugo Moreira, and Mathias Schannor and two reviewers Martin Guitreau and Dewashish Upadhyay for their constructive reviews and scientific input, which greatly helped to improve the original manuscript. The authors are grateful to Margareth Sugano, É

Received Date: 2021-03-05
Accepted Date: 2022-01-13
Rev Recd Date: 2021-12-06
Publish Date: 2022-02-03

Abstract

Abstract

The composition and formation of the Earth's primitive continental crust and mantle differentiation are key issues to understand and reconstruct the geodynamic terrestrial evolution, especially during the Archean. However, the scarcity of exposure to these rocks, the complexity of lithological relationships, and the high degree of superimposed deformation, especially with long-lived magmatism, make it difficult to study ancient rocks. Despite this complexity, exposures of the Archean Mairi Gneiss Complex basement unit in the São Francisco Craton offer important information about the evolution of South America's primitive crust. Therefore, here we present field relationships, LA-ICP-SFMS zircon U-Pb ages, and LA-ICP-MCMS Lu-Hf isotope data for the recently identified Eoarchean to Neoarchean gneisses of the Mairi Complex. The Complex is composed of massive and banded gneisses with mafic members ranging from dioritic to tonalitic, and felsic members ranging from TTG (Tonalite-Trondhjemite-Granodiorite) to granitic composition. Our new data point to several magmatic episodes in the formation of the Mairi Gneiss Complex:Eoarchean (ca. 3.65-3.60 Ga), early Paleoarchean (ca. 3.55-3.52 Ga), middle-late Paleoarchean (ca. 3.49-3.33 Ga) and Neoarchean (ca. 2.74-2.58 Ga), with no records of Mesoarchean rocks. Lu-Hf data unveiled a progressive evolution of mantle differentiation and crustal recycling over time. In the Eoarchean, rocks are probably formed by the interaction between the pre-existing crust and juvenile contribution from chondritic to weakly depleted mantle sources, whereas mantle depletion played a role in the Paleoarchean, followed by greater differentiation of the crust with thickening and recycling in the middle-late Paleoarchean. A different stage of crustal growth and recycling dominated the Neoarchean, probably owing to the thickening of the continental crust by collision, continental arc growth, and mantle differentiation.
- Sã,
- o Francisco Craton,
- Mairi Gneiss Complex,
- Primitive continental crust,
- Zircon U-Pb dating,
- Lu-Hf isotope geochemistry

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References(95)

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