Fig. 5: Chemical differences between deformed and undeformed Kīlauean olivine grains.
From: Microstructural constraints on magmatic mushes under Kīlauea Volcano, Hawaiʻi
a, b Olivine forsterite contents (mol%) vs. matrix glass Mg# (Fe3+/FeT = 0.15; ~QFM; see ref. 84). Olivine-liquid equilibrium lines are shown for KD = 0.270–0.352 (ref. 85, 86). Both deformed and undeformed grains have higher forsterite contents than the equilibrium olivine composition of their matrix glasses. However, deformed grains show a narrower range of forsterite contents, which lie further from the equilibrium field than undeformed grains. c–f Cumulative distribution functions comparing undeformed (solid lines) and deformed (dashed lines) olivines for four eruptions. Deformed grains are more primitive at a statistically significant level (p < 0.01) using the two sample Kolmogorov-Smirnov test. The test statistic D (representing the distance between the two distributions) is also shown. SSWRZ, seismic South West Rift Zone; VSWRZ, volcanic South West Rift Zone.
