Extended data Figure 4. Ruthenium isotope plots illustrating systematic compositional differences between enstatite (EC), ordinary (OC) and CI carbonaceous chondrites (CI), modern mantle and pre-late veneer mantle in comparison to mixing lines calculated between the modern mantle composition and isotopic variations caused by variable contributions of s-process Ru nuclides, a fissiogenic Ru component, and variations of nuclear field-shift induced isotope fractionations.

(a) Ruthenium isotope data for the Eoarchean mantle of SW Greenland, the modern mantle, and ordinary, enstatite and CI carbonaceous chondrites in comparison to a mixing line calculated between the composition of the modern mantle (ε¹⁰²Ru = ε¹⁰⁰Ru = 0) and an s-process component³⁴ (dashed line), and the slope calculated for a nuclear field shift-induced (NSF) fractionation⁵¹ (black solid line). (b) Ruthenium isotope composition of the Eoarchean mantle in comparison to mixing lines calculated between the composition of the modern mantle (ε⁹⁶Ru = ε¹⁰⁰Ru = 0) and a fissiogenic Ru component⁵³ (dotted line), an s-process component³⁴ (dashed line), and the slope calculated for nuclear field shift-induced (NSF) isotope fraction⁵¹ (solid black line).