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Fig. 1 | Progress in Earth and Planetary Science

Fig. 1

From: Major element composition of an Early Enriched Reservoir: constraints from 142Nd/144Nd isotope systematics in the early Earth and high-pressure melting experiments of a primitive peridotite

Fig. 1

Schematic illustrations of EER formation. (Top) The 142Nd/144Nd evolution considered in this study. A source region differentiates into the EER and EDR. The EER is hidden within or has been lost from the Earth. The EDR and intact region were mixed to form the ASE. (Bottom) A box model of the EER formation, where X is the fraction of the source region relative to the whole mantle. ASE Accessible Silicate Earth (part of the silicate Earth from which we can obtain materials for analysis), EER Early Enriched Reservoir (low-Sm/Nd reservoir which can compensate for the 142Nd/144Nd difference between ASE and chondrites), EDR Early Depleted Reservoir (residual solid produced by the EER formation), CHUR Chondritic Uniform Reservoir (putative primitive mantle having a chondritic composition)

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