<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Huang, Dongyang</style></author><author><style face="normal" font="default" size="100%">Siebert, Julien</style></author><author><style face="normal" font="default" size="100%">Badro, James</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">High pressure partitioning behavior of Mo and W and late sulfur delivery during Earth's core formation</style></title><secondary-title><style face="normal" font="default" size="100%">Geochimica et Cosmochimica Acta</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">core formation</style></keyword><keyword><style  face="normal" font="default" size="100%">high pressure</style></keyword><keyword><style  face="normal" font="default" size="100%">metal-silicate partitioning</style></keyword><keyword><style  face="normal" font="default" size="100%">Mo/W ratio</style></keyword><keyword><style  face="normal" font="default" size="100%">siderophile elements</style></keyword><keyword><style  face="normal" font="default" size="100%">Volatile delivery</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2021</style></year><pub-dates><date><style  face="normal" font="default" size="100%">oct</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.sciencedirect.com/science/article/pii/S0016703721003896 https://linkinghub.elsevier.com/retrieve/pii/S0016703721003896</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">310</style></volume><pages><style face="normal" font="default" size="100%">19–31</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">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&amp;#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 40–93 GPa and 3000–4700 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&amp;#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.</style></abstract></record></records></xml>