Randomized trial reveals crust-mantle interaction through stable isotopes in sanukitoids, suggesting complex recycling processes.
Key Points
This research aims to understand the interactions between surface, crust, and mantle systems in early Earth using sanukitoids as a record of recycling processes.
Analyzed Ba and Mg stable isotopes along with radiogenic isotopes and elemental data from 3.4-2.1 Ga sanukitoids
Investigated isotopic compositions to trace crust-mantle interactions
Compared isotopic signatures of Archean and Paleoproterozoic sanukitoids
Archean sanukitoids showed high variability in Ba and Mg isotopic compositions, indicating contributions from altered ocean crust and sediments.
Paleoproterozoic sanukitoids exhibited uniformly lighter isotopic signatures, similar to Phanerozoic arc magmas influenced by pelagic sediments.
Ba isotope fractionation suggests local sulfate production and oxidized conditions before the Great Oxidation Event.