Figure 4: Variation in CO2 content as a function of Nb content.
From: Heterogeneity in mantle carbon content from CO2-undersaturated basalts
Red dashed line: average CO2/Nb in the equatorial MAR melt inclusions. The Siqueiros melt inclusions4 (green dashed line: average CO2/Nb) and matrix glasses4, the popping rock2 and the undersaturated ultradepleted MORB glasses13 are also plotted for comparison. The matrix glasses from both Siqueiros and equatorial MAR samples plot consistently with the global MORB glass database49, affected by variable amounts of carbon degassing (thin grey lines, graduated in % of CO2 loss, assuming an initial undegassed CO2/Nb of 557).
