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Barium content of Archaean continental crust reveals the onset of subduction was not global

Earth Sciences

Barium content of Archaean continental crust reveals the onset of subduction was not global

G. Huang, R. N. Mitchell, et al.

Uncover the secrets of Earth's earliest continental crust with this fascinating study by Guangyu Huang, Ross N. Mitchell, Richard M. Palin, Christopher J. Spencer, and Jinghui Guo. By analyzing Ba concentrations in Tonalite-trondhjemite-granodiorite (TTG) suites, the research reveals that only low geothermal gradients in hot subduction zones can produce Ba-rich TTGs, shedding light on the diachronous onset of subduction from 4 Ga to 2.7 Ga.

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Abstract
Tonalite-trondhjemite-granodiorite (TTG) suites dominate Earth's earliest continental crust, offering insights into Archaean geodynamics. This study uses petrological modeling to predict Ba concentrations in TTGs, revealing that only low geothermal gradients (hot subduction zones) produce Ba-rich TTGs. Statistically significant increases in global TTG Ba contents show a diachronous onset of subduction, from regional at 4 Ga to globally complete after 2.7 Ga.
Publisher
nature communications
Published On
Nov 02, 2022
Authors
Guangyu Huang, Ross N. Mitchell, Richard M. Palin, Christopher J. Spencer, Jinghui Guo
Tags
TTG suites
Ba concentrations
Archaean geodynamics
hot subduction zones
subduction onset

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