Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
Incorporation of atmospheric components in planetary magma oceans through bubble–metal compounds. |
| Συγγραφείς: |
Gaillard, Fabrice, Pereira, Luiz, Arbaret, Laurent, Iacono-Marziano, Giada, Le Trong, Emmanuel, Bernadou, Fabien, Marrocchi, Yves |
| Πηγή: |
Science; 10/1/2026, Vol. 394 Issue 6819, p97-101, 5p |
| Θεματικοί όροι: |
Light elements, Origin of planets, Planetary interiors, Cosmochemistry, Metal compounds |
| Περίληψη: |
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. On small bodies, low gravity would have enabled millimeter- to centimeter-sized compounds to sink, trapping atmophiles in their interiors. This mechanism links core formation to the early entrapment of atmophile elements and provides a framework for reconciling volatile delivery across planetary bodies and planetary accretion models. Editor's summary: Earth and other planets formed by collision of smaller bodies. However, it is not clear how these smaller bodies were able to gravitationally retain and deliver the light, volatile building blocks of our atmosphere. Gaillard et al. ran high-pressure experiments on a starting material representative of the "magma oceans" on small, early planetary bodies. They observed that bubbles latched onto metal droplets, forming coalescing clusters that sank or rose with net buoyancy. The lower gravity on asteroid-scale bodies would have allowed small bubble-metal clusters to sink into the interior, thereby sequestering volatiles for later collision and accretion. —Angela Hessler [ABSTRACT FROM AUTHOR] |
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| Βάση Δεδομένων: |
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