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

Natural Sciences Unit, Finnish Museum of Natural History, University of Helsinki, P.O. Box 44, 00014 Helsinki, Finland
Geosciences 2018, 8(9), 353; https://doi.org/10.3390/geosciences8090353
Received: 17 August 2018 / Revised: 7 September 2018 / Accepted: 11 September 2018 / Published: 17 September 2018
(This article belongs to the Special Issue Geology of the Early Earth – Geodynamic Constraints from Cratons)
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. View Full-Text
Keywords: Eoarchaean; Paleoarchaean; Mesoarchaean; Neoarchaean; Archaean geochemistry; granitoids; TTG; sanukitoids; Archaean geodynamics; origin of continents Eoarchaean; Paleoarchaean; Mesoarchaean; Neoarchaean; Archaean geochemistry; granitoids; TTG; sanukitoids; Archaean geodynamics; origin of continents
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Halla, J. Highlights on Geochemical Changes in Archaean Granitoids and Their Implications for Early Earth Geodynamics. Geosciences 2018, 8, 353.

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