@article {Huang2021,
	title = {High pressure partitioning behavior of Mo and W and late sulfur delivery during Earth{\textquoteright}s core formation},
	journal = {Geochimica et Cosmochimica Acta},
	volume = {310},
	year = {2021},
	month = {oct},
	pages = {19{\textendash}31},
	abstract = {Mo and W in the bulk silicate Earth and their partitioning behavior between molten metal and silicate can be used to constrain the thermochemical conditions during Earth\&$\#$039;s core-mantle differentiation. In order to improve our understanding of core-forming conditions, we performed a series of superliquidus metal-silicate partitioning experiments on Mo and W at 40{\textendash}93 GPa and 3000{\textendash}4700 K in laser-heated diamond anvil cells. Under the extended P-T conditions directly relevant to terrestrial core formation in a deep magma ocean, we find that pressure and temperature have profound yet opposing effects on their partitioning, and a significant amount of O dissolved in the metal. Based on an activity model for liquid Fe-rich metal, it is observed that O enhances the solubility of both Mo and W in the metal, whereas S makes W significantly less siderophile than Mo. Combining our new data with those of the literature, we modeled the effects of pressure, temperature and metal composition on partitioning, and applied them to a multi-stage accretion model. While our model with homogeneous S accretion successfully explains the abundance of Mo, it underestimates that of W and therefore overestimates Mo/W ratio in Earth\&$\#$039;s mantle, regardless of the oxidation conditions prevailing during core formation. On the other hand, mantle observables (Mo and W abundances, Mo/W ratio) can be reproduced simultaneously if S is supplied to the Earth towards the end of accretion. This corroborates previous work at lower pressures, and agrees with heterogeneous accretion models where the late volatile-rich delivery was envisaged to explain various isotopic signatures of terrestrial bodies. Nonetheless, this conclusion does not discriminate between reducing and oxidizing conditions.},
	keywords = {core formation, high pressure, metal-silicate partitioning, Mo/W ratio, siderophile elements, Volatile delivery},
	issn = {00167037},
	doi = {10.1016/j.gca.2021.06.031},
	url = {https://www.sciencedirect.com/science/article/pii/S0016703721003896 https://linkinghub.elsevier.com/retrieve/pii/S0016703721003896},
	author = {Huang, Dongyang and Siebert, Julien and Badro, James}
}
