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Melt Properties

Melt Properties. Updates/questions?. Labs: Field trip:18 th or 19 th ? Last lecture’s 3 remaining slides in lab Today’s topics: Magma properties. Melt properties - Internal variables. Composition. Majority of Earth’s minerals are …?. Bill White’s Geochemistry book. Silicates.

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Melt Properties

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  1. Melt Properties

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

  3. Melt properties - Internal variables

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

  5. Silicates http://visionlearning.com/library/modules/mid140/Image/VLObject-3539-060516120522.jpg

  6. Networks http://visionlearning.com/library/modules/mid140/Image/VLObject-3539-060516120522.jpg

  7. Bridging Oxygen http://visionlearning.com/library/modules/mid140/Image/VLObject-3539-060516120522.jpg www.uwgb.edu/dutchs/PETROLGY/NesoSoro.HTM

  8. NBO/T • NBO/T change with melt composition….why? Rhyolite Basalt Mysen, 1983

  9. Structure in Melt Carmichael et al., 1974

  10. Breaking the polymers www.origins.rpi.edu/claycatalyzed.html Carmichael et al., 1974

  11. Effect of volatiles

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

  13. Viscosity

  14. 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

  15. Viscosity

  16. Viscosity, composition, temperature Decreasing SiO2 Scarfe., 1986

  17. Viscosity and pressure Scarfe., 1986

  18. Viscosity and H2O Scarfe., 1986

  19. Lava types and viscosity USGS Ctein

  20. 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)

  21. Rheology and time Webb & Dingwell, 1995

  22. Glass Transition

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