Melt Properties. Updates/questions? Labs: Field trip:18 th or 19 th ? Last lecture’s 3 remaining slides in lab Today’s topics: 1.Magma properties.

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Presentation transcript:

Melt Properties

Updates/questions? Labs: Field trip:18 th or 19 th ? Last lecture’s 3 remaining slides in lab Today’s topics: 1.Magma properties

Melt properties - Internal variables

Composition Majority of Earth’s minerals are …? Bill White’s Geochemistry book

Silicates jpg

Networks jpg

Bridging Oxygen e/VLObject jpg

NBO/T NBO/T change with melt composition….why? Mysen, 1983 RhyoliteBasalt

Structure in Melt Carmichael et al., 1974

Breaking the polymers Carmichael et al.,

Effect of volatiles

Polymerization and Viscosity What will move more easily: a)Shorter chain polymers? b)3D networks? What does that mean w.r.t. rock types?

Viscosity

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Viscosity

Viscosity, composition, temperature Scarfe., 1986 Decreasing SiO 2

Viscosity and pressure Scarfe., 1986

Viscosity and H 2 O Scarfe., 1986

Lava types and viscosity USGS Ctein

Viscosity regimes Regimes related to temperature w.r.t. Tg T >> Tg Viscosity very low, follows power law:  (T) =  o (T-T c ) -   ~2, T c = critical T (> Tg) T ~ Tg Intermediate viscosity, follows exponential:  (T) = A e exp(B e /(TS conf )) Ae~0.003, S from experiments, B e from fit T << Tg: Very high viscosity: sample turned into glass (Bottinga et al., 1995)

Rheology and time Webb & Dingwell, 1995

Glass Transition