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Implications of the Nuvvuagittuq greenstone belt for the formation of Earth’s early crust

O'Neil, J., Francis, D., Carlson, R. W.·2011·Journal of Petrology

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Abstract

U–Pb geochronology for the Nuvvuagittuq greenstone belt put a minimum age constraint of ∼3·8 Ga for the supracrustal lithologies. Recent 142Nd work raised the possibility that the dominant lithology of the belt formed at ∼4·28 Ga, which would make it the only known remnant of Hadean crust preserved on Earth. The dominant lithology of the belt has a mafic composition that consists of gneisses ranging from cummingtonite amphibolite to garnet–biotite schist composed of variable proportions of cummingtonite + biotite + quartz, ± plagioclase ± garnet ± anthophyllite ± cordierite. The composition of this unit ranges from basalt to andesite and it is divided into two distinct geochemical groups that are stratigraphically separated by a banded iron formation (BIF). At the base of the sequence, the mafic unit is mainly basaltic in composition and generally has relatively low Al2O3 and high TiO2 contents, whereas above the BIF, the unit is characterized by high Al2O3 and low TiO2 contents and exhibits a wider range of compositions from basaltic to andesitic. The low-Ti unit can be further subdivided into a trace element depleted and a trace element enriched subgroup. The high-Ti unit is characterized by relatively flat REE patterns as opposed to the low-Ti gneisses, which display light REE-enriched profiles with flat heavy REE slopes. The incompatible element depleted low-Ti rocks have U-shaped REE profiles. The geochemical groups have compositional analogues in three types of ultramafic sills that exhibit the same stratigraphic succession. Generally, the mafic gneisses have low Ca, Na and Sr contents, with many samples having CaO contents <1 wt %. Such low Ca contents are unlikely to represent the original composition of their igneous precursors and are interpreted to reflect intensive alteration of plagioclase. These compositional characteristics along with the presence of cordierite + anthophyllite suggest that the protoliths of the mafic gneisses were mafic volcanic rocks exhibiting variable degrees of hydrothermal alteration. The high-Ti compositional type shares geochemical characteristics with tholeiitic volcanic suites with low Al2O3 and high TiO2 contents and is consistent with crystal fractionation at low pressures under dry conditions. In contrast, the low-Ti compositional group is geochemically similar to boninitic and calc-alkaline volcanic suites. The high Al2O3 and low TiO2 contents in the andesitic compositions suggest the early crystallization of Fe–Ti oxides and late appearance of plagioclase, and are more consistent with fractionation at elevated water pressures. The succession from 'tholeitic' to 'calc-alkaline' magmatism seen in the Nuvvuagittuq greenstone belt is typical of the volcanic successions of many younger Archean greenstone belts. Regardless of the exact tectonic setting, this volcanic succession suggests that the geological processes responsible for the formation and evolution of Archean greenstone belts were active at 3·8 Ga and perhaps as early as 4·3 Ga.

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Authors: O'Neil, J., Francis, D., & Carlson, R. W.
ORCID: Carlson, R. W.
Venue: Journal of Petrology
Publisher: Oxford University Press (OUP)
Published: 2011-04-19
Volume: 52
Issue: 5
Pages: 985-1009
ISSN: 0022-3530 (ISSN-L)
1460-2415
DOI: 10.1093/petrology/egr014
OpenAlex: W2149198614
Cited by: 151
References: 75
Citations by year: 2026: 3 · 2025: 5 · 2024: 6 · 2023: 8 · 2022: 10 · 2021: 9 · 2020: 11 · 2019: 9 · 2018: 10 · 2017: 14 · 2016: 15 · 2015: 17 · 2014: 16 · 2013: 8 · 2012: 7
FWCI: 9.71
Type: journal article
Language: en
Open access: closed
Locations: Journal of Petrology (publishedVersion)
Topics: Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geological and Geochemical Analysis
Physical Sciences › Earth and Planetary Sciences › Space and Planetary Science › Astro and Planetary Science
Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
Keywords: Hadean crust, U-Pb geochronology, Nd isotopes, banded iron formations, mafic gneiss, hydrothermal alteration, plagioclase alteration, fractional crystallization, crustal growth, crustal recycling

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Implications of the Nuvvuagittuq greenstone belt for the formation of Earth’s early crust

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