Fig. 4: Conditions at MI entrapment and conceptual model of MI bubble growth.
From: Highly explosive basaltic eruptions driven by CO2 exsolution
a, b Dissolved CO2 in the Sunset Crater magma at the time of MI entrapment. Group I samples (filled symbols) are plotted with their total CO2 (glass + bubble). For Group II samples (cyan symbols), total CO2 content is calculated assuming that 35% of the originally dissolved CO2 content is sequestered into a bubble. a H2O–CO2 of MIs; curves are isobars from ref. 32. b Dissolved CO2 at entrapment vs. Fo content of the olivine host measured next to the MI. Error from FTIR analysis is 10% for H2O and 5% for CO2, while the error in the total CO2 content from bubble calculations is 5%. Error in MI bubble vol% is 15% (i.e., 0.3 vol% error for a 2 vol% bubble). See “Methods” for details on error estimates. c Interpretation of MI entrapment and bubble growth in MIs in the Sunset Crater magma. The modifications to the MIs shown are cumulative from the entrapment stage.
