Highlights on Geochemical Changes in Archaean Granitoids and Their Implications for Early Earth Geodynamics

Tutkimustuotos: ArtikkelijulkaisuKatsausartikkeliTieteellinenvertaisarvioitu

Kuvaus

The Archaean (4.0–2.5 Ga) continental crust is mainly composed of granitoids, whose geochemical characteristics are a function of their formation mechanisms and components, as well as physical conditions of their source. Therefore, revealing changes in Archaean geodynamic processes requires understanding of geochemical changes in Archaean granitoids. This paper compares key geochemical signatures in granitoid occurrences from the Eoarchaean to Neoarchaean Eras and aims to highlight changes or variations in their geochemical signatures. The study is performed by exploring and comparing geochemical and geochronological datasets of Archaean granitoids compiled from literature. The results show that two end-members of sodic TTGs (tonalite–trondhjemite–granodiorite) occur throughout the Archaean: low- and high-HREE (heavy rare earth elements) types. A profound change in granitoid geochemistry occurred between 3.0 and 2.5 Ga when multi-source high-K calc-alkaline granitoid batholiths emerged, possibly indicating the onset of modern-type plate tectonics.
Alkuperäiskielienglanti
Artikkeli353
LehtiGeosciences
Vuosikerta8
Numero9
Sivumäärä12
ISSN2076-3263
DOI - pysyväislinkit
TilaJulkaistu - 17 syyskuuta 2018
OKM-julkaisutyyppiA2 Katsausartikkeli tieteellisessä aikakauslehdessä

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title = "Highlights on Geochemical Changes in Archaean Granitoids and Their Implications for Early Earth Geodynamics",
abstract = "The Archaean (4.0–2.5 Ga) continental crust is mainly composed of granitoids, whose geochemical characteristics are a function of their formation mechanisms and components, as well as physical conditions of their source. Therefore, revealing changes in Archaean geodynamic processes requires understanding of geochemical changes in Archaean granitoids. This paper compares key geochemical signatures in granitoid occurrences from the Eoarchaean to Neoarchaean Eras and aims to highlight changes or variations in their geochemical signatures. The study is performed by exploring and comparing geochemical and geochronological datasets of Archaean granitoids compiled from literature. The results show that two end-members of sodic TTGs (tonalite–trondhjemite–granodiorite) occur throughout the Archaean: low- and high-HREE (heavy rare earth elements) types. A profound change in granitoid geochemistry occurred between 3.0 and 2.5 Ga when multi-source high-K calc-alkaline granitoid batholiths emerged, possibly indicating the onset of modern-type plate tectonics.",
keywords = "1171 Geosciences",
author = "Jaana Halla",
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month = "9",
day = "17",
doi = "10.3390/geosciences8090353",
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Highlights on Geochemical Changes in Archaean Granitoids and Their Implications for Early Earth Geodynamics. / Halla, Jaana.

julkaisussa: Geosciences, Vuosikerta 8, Nro 9, 353, 17.09.2018.

Tutkimustuotos: ArtikkelijulkaisuKatsausartikkeliTieteellinenvertaisarvioitu

TY - JOUR

T1 - Highlights on Geochemical Changes in Archaean Granitoids and Their Implications for Early Earth Geodynamics

AU - Halla, Jaana

PY - 2018/9/17

Y1 - 2018/9/17

N2 - The Archaean (4.0–2.5 Ga) continental crust is mainly composed of granitoids, whose geochemical characteristics are a function of their formation mechanisms and components, as well as physical conditions of their source. Therefore, revealing changes in Archaean geodynamic processes requires understanding of geochemical changes in Archaean granitoids. This paper compares key geochemical signatures in granitoid occurrences from the Eoarchaean to Neoarchaean Eras and aims to highlight changes or variations in their geochemical signatures. The study is performed by exploring and comparing geochemical and geochronological datasets of Archaean granitoids compiled from literature. The results show that two end-members of sodic TTGs (tonalite–trondhjemite–granodiorite) occur throughout the Archaean: low- and high-HREE (heavy rare earth elements) types. A profound change in granitoid geochemistry occurred between 3.0 and 2.5 Ga when multi-source high-K calc-alkaline granitoid batholiths emerged, possibly indicating the onset of modern-type plate tectonics.

AB - The Archaean (4.0–2.5 Ga) continental crust is mainly composed of granitoids, whose geochemical characteristics are a function of their formation mechanisms and components, as well as physical conditions of their source. Therefore, revealing changes in Archaean geodynamic processes requires understanding of geochemical changes in Archaean granitoids. This paper compares key geochemical signatures in granitoid occurrences from the Eoarchaean to Neoarchaean Eras and aims to highlight changes or variations in their geochemical signatures. The study is performed by exploring and comparing geochemical and geochronological datasets of Archaean granitoids compiled from literature. The results show that two end-members of sodic TTGs (tonalite–trondhjemite–granodiorite) occur throughout the Archaean: low- and high-HREE (heavy rare earth elements) types. A profound change in granitoid geochemistry occurred between 3.0 and 2.5 Ga when multi-source high-K calc-alkaline granitoid batholiths emerged, possibly indicating the onset of modern-type plate tectonics.

KW - 1171 Geosciences

U2 - 10.3390/geosciences8090353

DO - 10.3390/geosciences8090353

M3 - Review Article

VL - 8

JO - Geosciences

JF - Geosciences

SN - 2076-3263

IS - 9

M1 - 353

ER -