Fig. 9: Temporal distribution and evolution of TTGs. | Communications Earth & Environment

Fig. 9: Temporal distribution and evolution of TTGs.

From: Diverse genesis of early Earth’s continental crust hints the geodynamic transition at about 3.0 Gyrs ago

Fig. 9: Temporal distribution and evolution of TTGs.The alternative text for this image may have been generated using AI.

a Histogram of the ages of Archean “HP”-TTGs (light-orange) from different cratons. The numbers in the right corners represent the number of “HP”-TTG data. Kernel density estimations of the Archean arc-type basalts predicted through machine learning (cyan) are from ref. 70. The appearance of “HP”-TTGs aligns closely with that of arc-type basalts. b Cr versus Mg#. The “HP”-TTGs with the ages of 3.0–3.9 Ga have higher Cr content than experimental TTG melts72 but lower Cr content than “HP”-TTGs with ages of 2.5–3.0 Ga, showing limited interaction with the mantle wedge. The vector of mixing with mantle peridotite comes from ref. 27.

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