Figure 3: Equilibrium tests for clinopyroxene.
From: Locating the depth of magma supply for volcanic eruptions, insights from Mt. Cameroon
Equilibrium test for (a) clinopyroxene from the 1999 eruption paired with whole rock data of Mg# 53.7 (ref. 8) and Mg# 50.2 (ref. 7). (b) Clinopyroxene from the 2000 eruption paired with whole rock data of Mg# 54.4 (ref. 8) and Mg# 50.2 (ref. 7). Both tests (a,b) employ a KD[FeMg] of 0.275 ± 0.067 to define the equilibrium envelope16 and all data points that fall within this envelope are used for further equilibrium assessment. (c) Predicted versus observed clinopyroxene mineral components (diopside and hedenbergite) for the 1999 pyroxenes paired with the Mg# 53.7 and Mg# 50.2 nominal melts. (d) Predicted versus observed clinopyroxene mineral components (diopside and hedenbergite) for the 2000 pyroxenes paired with the Mg# 54.4 and Mg# 50.2 nominal melts. (e) Predicted versus observed clinopyroxene mineral components (jadeite) for the 1999 pyroxenes paired with the Mg# 53.7 and Mg# 50.2 nominal melts. (f) Predicted versus observed clinopyroxene mineral components (jadeite) for the 2000 pyroxenes paired with the Mg# 54.4 and Mg# 50.2 nominal melts. Only data that satisfy all equilibrium conditions (i.e. that fall within all tested equilibrium envelopes) are taken further for thermobarometry modelling.
