RUSSIAN JOURNAL OF EARTH SCIENCES, VOL. 18, ES1003, doi:10.2205/2018ES000614, 2018 Figure 1. Normalised (to carbonaceous chondrites C1 and an involatile element, e.g., Al, Ir) abundances of highly siderophile elements (Noble Metals, NM) in the Earth's mantle. (a) Notice almost a chondrite-like concentration pattern in spite of the much lower concentrations compared with those in chondrites. However, the observed concentrations still (by orders of magnitude) exceed those, expected from equilibrium metal/silicate partitioning; moreover, such partitioning should result in rather different concentrations, in contract to those observed. Modified after Righter and Drake [2000]. (b) A comparison between terrestrial and chondritic abundances of noble metals. NM concentrations in enstatite chondrites are most similar to the terrestrial values. Modified after Walker et al. [2015]. Copyright 2018 by the Geophysical Center RAS. Generated from LaTeX source by ELXpaper, v.1.5 software package. |