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Séminaire de Tony Withers
22 mai 2017 à 14 h 00 min - 15 h 30 min
Le séminaire de Tony Withers (Western University, Ontario, Canada) a lieu le mardi 22 Mai à 14h dans la salle des séminaires (1.10).
Title : Earth exhales: a volatile history
Earth is an attractive place to live primarily owing to the presence at the surface of the volatile elements (C, H, O, etc.) needed for life, together with an atmosphere to protect and nurture living things. Volatiles that dissolve in silicate melts can be redistributed within planets and transported to the surface to be released through volcanism. The modern Earth ‘exhales’ volatile elements from its interior in gaseous form at divergent margins, and ingests some of these same elements at subduction zones. I will give an experimentalist’s view of some of the factors that control the dissolution of volatiles in silicate melts and thus affect the generation and modification of planetary atmospheres under conditions unlike those that prevail today on Earth.