Phase Equilibrium Phase Rule Phase Diagram

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Makaopuhi Lava LakeMineral composition during crystallization100Olivine Augite Plagioclase90Weight % Glass80706050.9 .8 .7 .9 .8 .7 .6 80 70 60Mg / (Mg + Fe) Mg / (Mg + Fe) AnFig. 6-3. From Wright and Okamura, (1977) USGS Prof. Paper, 1004.
Crystallization Behavior of Melts1. Cooling melts crystallize from a liquid to a solid over a range oftemperatures (and pressures)2. Several minerals crystallize over this T range, and the number ofminerals increases as T decreases3. The minerals that form do so sequentially, , with remarkable overlap4. Minerals that involve solid solution change composition as coolingprogresses5. The melt composition also changes during crystallization6. The minerals that crystallize (as well as the sequence) depend on Tand X of the melt7. Pressure can affect the types of minerals that form and the sequence8. The nature and pressure of the volatiles can also affect the mineralsand their sequence
Page 1 and 2: Phase EquilibriumPhase RulePhase Di
Page 3 and 4: Makaopuhi Lava LakeThermocouple att
Page 5: Makaopuhi Lava LakeMinerals that fo
Page 9 and 10: 1 - C Systems1. The system H 2 OFig
Page 11 and 12: 2 - C SystemsA. Systems with Comple
Page 13 and 14: 2-C C Eutectic SystemsDiopside (Di
Page 15 and 16: • Continue cooling as X liq varie
Page 17 and 18: #s are listedpoints in textNote the
Page 19 and 20: Plagioclase forms before augiteOphi
Page 21 and 22: Eutectic systemIn a eutectic system
Page 23 and 24: C. Binary Peritectic SystemsAs T lo
Page 25: i = “peritectic” point1557 o C
Page 28 and 29: xWhen is the reaction finished?kiym
Page 30 and 31: Cool X = n• At 1960 o C hit solvu
Page 32: Pressure EffectsDifferent phases ha

Phase Equilibrium Phase Rule Phase Diagram

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