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

机译：古生花岗岩的地球化学变化及其对早期地球动力学的启示

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摘要

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.
机译：太古陆（4.0–2.5 Ga）大陆壳主要由花岗岩组成，其地球化学特征取决于其形成机制和成分以及其来源的物理条件。因此，揭示古生地球动力学过程的变化需要了解古生花岗岩的地球化学变化。本文比较了从始古纪到新古纪时代的花岗岩类中的关键地球化学特征，旨在突​​显其地球化学特征的变化或变化。该研究是通过探索和比较从文献中汇编的古生花岗岩的地球化学和年代学数据集而进行的。结果表明，整个古生菌中都存在苏打TTG的两个端部成员（低钠铁矿-长晶铁矿-granodiorite）：低和高HREE（重稀土元素）类型。当多源高钾钙碱性花岗岩基岩出现时，花岗岩的地球化学发生了重大变化，变化范围为3.0至2.5 Ga，这可能表明现代板块构造的开始。

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