Tweedle-dum and Tweedle-Dee: Phase Transitions Myrmektite.

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Presentation transcript:

Tweedle-dum and Tweedle-Dee: Phase Transitions Myrmektite

Solid State Phase Transformations

Silica: Rapid Cooling

Metastable tridymite and cristobalite are common in acid volcanic rocks

Silica: Rapid Cooling

Solid State Phase Transformations

Solid State: Exsolution

Alkali Feldspar

High Temperature Alkali Feldspar Found in volcanic rocks Anorthoclase, Mt Erebus

Low Temperature Alkali Feldspar Found in plutonic rocks

Low Temperature Alkali Feldspar Found in plutonic rocks

Plagioclase Feldspar Plagioclase Feldspars Two Feldspars Perthite Microcline without perthite and anorthite

Pyroxenes

Ca-poor Px Ca-rich Px Augite Temperature

Pyroxenes

Inverted Pigeonite Thickest along the 001 plane

Iron Meteorites and Cooling Rates Widmanstatten Texture Kamacite (low-Ni metal) Taenite (high-Ni metal)

Iron Meteorites and Cooling Rates

Liquid Immiscibility

Oldoinyo Lengai Gregory Rift, Tanzania

Liquid Immiscibility Natrocarbonatite lavas

Natrocarbonatite Lava

Liquid Immiscibility Explosive eruptions of mixed silicate (nephelinite) – carbonatite ash Carbonatite melt exsolves by liquid immiscibility from a nephelinite magma chamber

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