The first discovery of Hadean zircon in garnet granulites from the Sutam River (Aldan Shield)

Glukhovskii, M. Z.; Kuzmin, M. I.; Bayanova, T. B.; Lyalina, L. М.; Makrygina, V. A.; Shcherbakova, T. F.

doi:10.1134/s1028334x17090033

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…The Thus, the new data on single zircon grains from TTG and paragneisses of the Central-Kola megablock imply a long-term and discrete evolution of the continental crust in the Fennoscandian Shield (3.17 -3.73 Ga). Noteworthy, the oldest part of the Hadean component is well-preserved in zircons that were subject to high-pressure metamorphism in Finland and granulite facies metamorphism [25] in Siberia (Aldan Shield, Russia). The latter has been dated using the ID-TIMS method; the single zircon age has been estimated at 3.94 Ga.…”

Section: Discussionmentioning

confidence: 99%

The Oldest Grey Gneisses and Tonalite-Trondhjemite Granodiorites in the Fennoscandian Shield: ID-TIMS and SHRIMP Data

Bayanova¹,

Kunakkuzin²,

Serov³

et al. 2020

OJG

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Genesis of the oldest continental crust retains a marked trace in the Earth's evolution over its 4.5 Ga history. Despite ample isotope data on the role of the continental crust in the Earth's evolution, there has been much debate on the origin of grey gneisses and tonalite-trondhjemite-granodiorites (TTG). Precise U-Pb (ID-TIMS) and SHRIMP data on single zircon for paragneisses and TTG (3158.2 ± 8.2 Ma) have indicated the Central-Kola and Belomorian (White Sea) megablocks of the Fennoscandian Shield to be 3.16 Ga and 3.70 Ga, respectively. The newly obtained ages of zircon from these megablocks indicate the origin of the discrete continental crust to be 3.16 and 3.70 Ga. It is close to the Nordsim zircon data on the Siurua TTG (Finland), which are 3.45 and 3.73 Ga in the core. The new summarized data on the Earth's oldest rocks (basement and continental crust) indicate the younger age of the rocks in the Fennoscandian Shield as compared to those in Australia (Kronendonk et al., 2019).

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Section: Discussionmentioning

confidence: 99%

The Oldest Grey Gneisses and Tonalite-Trondhjemite Granodiorites in the Fennoscandian Shield: ID-TIMS and SHRIMP Data

Bayanova¹,

Kunakkuzin²,

Serov³

et al. 2020

OJG

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The Archean Victoria Fjord terrane of northernmost Greenland and geodynamic interpretation of Precambrian crust in and surrounding the Arctic Ocean

Nutman

Bennett

Hidaka

et al. 2019

Journal of Geodynamics

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Time Between 3 and 2 Ga: Transitional Events in the Earth’s History

Yarmolyuk

Kuzmin

Donskaya

et al. 2021

Russian Geology and Geophysics

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—The time span between 3 and 2 Ga in the geologic history encompassed a number of key events on the cooling Earth. The cooling interrupted heat transfer within and across the mantle, which caused changes in Earth’s major spheres and in the mechanisms of their interaction. The great thermal divergence at 2.5 Ga and differentiation into the depleted upper asthenospheric and primitive lower mantle affected the compositions of oceanic basalts. The lower mantle cooling recorded by a systematic decrease in the temperature of komatiite magma generation at the respective depths began at 2.5 Ga and was accompanied by increasing abundance of arc basalts and by changes in the behavior of the Sr, Nd, and O isotope systems. It was the time when the continental lithosphere consisting of subcontinental lithospheric mantle and crust began its rapid growth, while the crust became enriched in felsic material with high contents of lithophile elements. Magmatism of the 3–2 Ga time span acquired more diverse major-element chemistry, with calc-alkaline and alkaline lithologies like carbonatite and kimberlite. The dramatic changes were driven by subduction processes, whereby the crust became recycled in the mantle and the double layer (D”) formed at the core–mantle boundary. The events of the 3–2 Ga interval created prerequisites for redox changes on the surface and release of free oxygen into the atmosphere. In terms of global geodynamics, it was transition from stagnantlid tectonics to plate tectonic regime, which approached the present-day style about 2.0–1.8 Ga.

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The first discovery of Hadean zircon in garnet granulites from the Sutam River (Aldan Shield)

Cited by 3 publications

References 8 publications

The Oldest Grey Gneisses and Tonalite-Trondhjemite Granodiorites in the Fennoscandian Shield: ID-TIMS and SHRIMP Data

The Oldest Grey Gneisses and Tonalite-Trondhjemite Granodiorites in the Fennoscandian Shield: ID-TIMS and SHRIMP Data

The Archean Victoria Fjord terrane of northernmost Greenland and geodynamic interpretation of Precambrian crust in and surrounding the Arctic Ocean

Time Between 3 and 2 Ga: Transitional Events in the Earth’s History

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