Other
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009e%26psl.288..108c&link_type=abstract
Earth and Planetary Science Letters, Volume 288, Issue 1-2, p. 108-114.
Other
7
Scientific paper
The abundances of siderophile elements in the silicate Earth indicate that Earth's iron-rich core probably formed at high pressure and high temperature. A popular model of core formation considers that the concentrations of several moderately siderophile elements are consistent with a scenario of simple single-stage equilibration at the base of a magma ocean. However, recent work using temperature sensitive partitioning data for V and Nb have casted doubt on this interpretation since the required basal temperature would greatly exceed that of the mantle solidus. Here we show that single-stage core formation event could explain the mantle contents of siderophile elements best constrained by experiment (Ni, Co, V, Mn, Cr, and Nb) provided that the core contains a few weight percents of oxygen. Our calculations, based on partitioning and metallurgy data, reveal that V and Nb become significantly less siderophile with increasing the O content of core-forming materials, while the behaviour of Ni, Co, Cr and Mn is little affected. Since the other likely light element candidates C, Si and S do not drastically influence the siderophile behaviour, we conclude that a simple-equilibration scenario is a viable hypothesis only if O contributes partially to the core density deficit. This interpretation is consistent with the W budget of the silicate Earth and recently published W metal-silicate partitioning data. The presence of a few weight percents of oxygen in the core is also in agreement with recent high-pressure high-temperature solubility measurements in molten iron equilibrated with perovskite and ferropericlase.
Badro James
Corgne Alexandre
Siebert Julien
No associations
LandOfFree
Oxygen as a light element: A solution to single-stage core formation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Oxygen as a light element: A solution to single-stage core formation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oxygen as a light element: A solution to single-stage core formation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1359467