Formation of oxidized sulfur-rich magmas in Neoarchaean subduction zones

Meng, Xuyang; Simon, Adam C.; Kleinsasser, Jackie; Mole, David R.; Kontak, Daniel J.; Jugo, Pedro J.; Mao, Jingwen; Richards, Jeremy P.

doi:10.1038/s41561-022-01071-5

Cited by 13 publications

(2 citation statements)

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“…Although localized and with less magnitude than the GOE, Archaean 'whiffs' of oxygen may have similarly altered the nature of subducted sediments 55 and started to modify the oxygen fugacity of mantle sources in the Archaean (compare with ref. 42). It then suggests that similar mantle-surface interactions could have had a major influence on magmatism and metallogenic endowment since the Archaean 56 and that the oxidation of the mantle was diachronous and related to the onset of global plate tectonics.…”

Section: An Atmospheric Window To the Mantlementioning

confidence: 99%

“…This avoids secondary alteration processes and offers a robust way to monitor the redox state of the primary magmas (for example, refs. [40][41][42]. Importantly, U-Pb-Hf isotopes of the host zircon can be used to provide information on the age and the source (that is, mantle or crustal origin) of the magma from which they crystallized 43 , and stable oxygen isotopes can identify a supracrustal component and aqueous alteration at varying temperatures 44,45 .…”

Section: Oxygen Fugacity and Recycling In The Geological Recordmentioning

confidence: 99%

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Sub-arc mantle fugacity shifted by sediment recycling across the Great Oxidation Event

Moreira,

Storey,

Bruand

et al. 2023

Nat. Geosci.

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The chemical exchange between the atmosphere, crust and mantle depends on sediment recycling via subduction. However, it remains unclear how atmospherically modified sediment may affect mantle oxygen fugacity through time. The Great Oxidation Event, among the most important atmospheric changes on Earth, offers an opportunity to investigate changes in magmatism related to surface–mantle interactions. Here we use sulfur K-edge micro X-ray absorption near-edge structure spectroscopy to measure the relative abundances of S6+, S4+ and S2− state in apatite inclusions hosted in 2.4–2.1-billion-year-old igneous zircons from the Mineiro Belt, Brazil. The host magmas record intracrustal melting of juvenile crust and the involvement of recycled sediments in the sub-arc mantle wedge. Unaltered apatite inclusions reveal a change from reduced to more oxidized magmas from pre- to post-Great Oxidation Event during the early Proterozoic. We argue that this change is a direct result of deep subduction of oxidized sediments and thus evidence of mantle–atmosphere interaction across the Great Oxidation Event. This suggests that the onset of sediment recycling in the Archaean provided atmospheric access to the mantle, and early ‘whiffs’ of oxygen may have already contributed to a localized increase of calc-alkaline magmatism and related ore deposits on Earth.

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Section: An Atmospheric Window To the Mantlementioning

confidence: 99%