Melt Properties
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Transcript of Melt Properties
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Melt Properties
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Updates/questions?
• Labs:• Field trip:18th or 19th?
• Last lecture’s 3 remaining slides in lab
Today’s topics:1. Magma properties
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Melt properties - Internal variables
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Composition
Majority of Earth’s minerals are …?
Bill White’s
Geochemistry book
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Silicates
http://visionlearning.com/library/modules/mid140/Image/VLObject-3539-060516120522.jpg
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Networks
http://visionlearning.com/library/modules/mid140/Image/VLObject-3539-060516120522.jpg
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Bridging Oxygen
www.uwgb.edu/dutchs/PETROLGY/NesoSoro.HTM
http://visionlearning.com/library/modules/mid140/Image/VLObject-3539-060516120522.jpg
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NBO/T•NBO/T change with melt composition….why?
Mysen, 1983
Rhyolite Basalt
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Structure in Melt
Carmichael et al., 1974
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Breaking the polymers
Carmichael et al., 1974
www.origins.rpi.edu/claycatalyzed.html
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Effect of volatiles
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Polymerization and Viscosity
• What will move more easily:
a) Shorter chain polymers?
b) 3D networks?
• What does that mean w.r.t. rock types?
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Viscosity
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Viscosity
http://video.google.com/videosearch?ndsp=18&um=1&hl=en&client=firefox-a&rls=org.mozilla:en-US:official&q=viscosity&ie=UTF-8&sa=N&tab=iv#ndsp=18&um=1&hl=en&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&q=viscosity&ie=UTF-8&sa=N&tab=iv&start=10
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Viscosity
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Viscosity, composition, temperature
Scarfe., 1986
Decreasing SiO2
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Viscosity and pressure
Scarfe., 1986
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Viscosity and H2O
Scarfe., 1986
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Lava types and viscosityUSGS
Ctein
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Viscosity regimes
Regimes related to temperature w.r.t. Tg
T >> Tg Viscosity very low,
follows power law: (T) = o(T-Tc)-
~2, Tc = critical T (> Tg)
T ~ Tg Intermediate viscosity,
follows exponential: (T) =
Aeexp(Be/(TSconf))
Ae~0.003, S from experiments, Be from fit
T << Tg: Very high viscosity: sample turned into
glass
(Bottinga et al., 1995)
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Rheology and time
Webb & Dingwell, 1995
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Glass Transition