Fig. 6: Geochemical modeling and calculated phase proportions for cases with varied source rock composition. | Communications Earth & Environment

Fig. 6: Geochemical modeling and calculated phase proportions for cases with varied source rock composition.

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

Fig. 6: Geochemical modeling and calculated phase proportions for cases with varied source rock composition.The alternative text for this image may have been generated using AI.

The left column represents the calculated results of partial melting at the “LP”-TTG forming condition, while the right column stands for the results of partial melting at the “HP”-TTG forming condition. The P-XH2O conditions for the formation of two types of TTGs are based on the thermodynamic modeling of median enriched Archean basalt27. a–c, e–g Compositional comparison (λ1 versus λ2, Sr versus Y, Nb versus Ta) between modeling melts derived from source rocks with varying Mg# and TTGs. Different colors stand for different Mg# of source rock, and the numbers around the nodes indicate the degree of partial melting. The calculated melt fractions are from 5 to 50% at 5% intervals. d, h Calculated modal proportion of minerals (garnet, amphibole, and clinopyroxene) versus Mg# of source rock, with the partial melting degree fixed at 30%. See Supplementary Fig. 15 for similar modeling based on “MP”-TTG forming condition.

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