气泡—金属化合物将大气组分带入行星岩浆洋

Fabrice Gaillard1*, Luiz Pereira2, Laurent Arbaret1, Giada Iacono- Marziano1, Emmanuel Le Trong1, Fabien Bernadou1,3, Yves Marrocchi4 Atmophile elements (carbon, hydrogen, and nitrogen) were thought to accrete late during planetary formation, yet cosmochemical and astrophysical evidence suggests that they were already present while small bodies, such as Vesta, were forming. High- temperature magmatic events on small bodies, however, should have outgassed these ultravolatile elements because gravity would have been insufficient to retain them. In this study, experiments reveal that gas bubbles strongly attach to metal droplets in magma ocean–like mixtures, forming compounds that resist segregation. early flotation of such compounds would have enhanced mantle siderophile endowment, eliminating the need for late accretion. …