Melt inclusion vapour bubbles: the hidden reservoir for major and volatile elements.

ABSTRACT: Olivine-hosted melt inclusions (MIs) provide samples of magmatic liquids and their dissolved volatiles from deep within the plumbing system. Inevitable post-entrapment modifications can lead to significant compositional changes in the glass and/or any contained bubbles. Re-heating is a common technique to reverse MI crystallisation; however, its effect on volatile contents has been assumed to be minor. We test this assumption using crystallised and glassy basaltic MIs, combined with Raman spectroscopy and 3D imaging, to investigate the changes in fluid and solid phases in the bubbles before and after re-heating. Before re-heating, the bubble contains CO₂ gas and anhydrite (CaSO₄) crystallites. The rapid diffusion of major and volatile elements from the melt during re-

SUBMITTER: Venugopal S 

PROVIDER: S-EPMC7270139 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature