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Ted Scott
Ph.D. 2006 (2003-2006), University of Minnesota
(A Determination of the Viscosity of Partially
Molten Peridotite at Melt Fractions up to the RCMF and the Effect of Incompatible Elements in Olivines
on the Rates of Cation Diffusion)
M.S., Geophysics, 2000, University of Minnesota
(Lattice-Boltzmann calculation of the
permeability of MORB in peridotite)
B.S., Comp. Sci., 1997, University of Minnesota (minors in
Physics, Anthropology)
Contact Information
8304 159th PL NE
Redmond, WA 98052
Email: fishdaddyo@gmail.com
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Current Projects
Rheological Properties of Olivine + MORB (lots of it)
Recently, I measured the rheological properties of partially molten aggregates of San Carlos olivine and
mid-oceanic ridge basalt (MORB) with melt contents above 15 vol%. These measurements allowed me to determine
the rheologically critical melt fraction (RCMF), the point at which melt viscosity begins
to dominate over solid viscosity for the bulk rock flow behavior, as well as verify the validity of the current
flow law (e.g. Hirth & Kohlstedt, 2004) for strain rate vs melt fraction. I also use my viscosity
measurements to constrain the grain size, melt fraction and dominant creep regime in Io's mantle, which in
turn allow for better understanding of terrestrial planet evolution.
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Effect of Grain Boundary Segregants on Interdiffusion rates in Olivine
I have also measured the effect of grain boundary segregants on the interdiffusion coefficients in diffusion couples
of polycrystalline cobalt olivine and forsterite. Cobalt and Magnesium
can both reside happily in the lattice of either mineral and hence there
should not be significant grain boundary segregation of cobalt in the
forsterite grains and vice versa (Co, Mg segregation factor ~ 1). I measured the interdiffusivity, D(Co-Mg), between undoped
samples of Co-olivine and Forsterite. Using these values and the single crystal interdiffusion coefficients determined by
Morioka (1980, 1981) I then
repeated my interdiffusion experiments (as performed on the undoped samples) on samples of forsterite and cobalt olivine
doped with a small amount of Calcium or Scandium, both of which
have been shown to prefer grain boundaries in
olivine e.g.,(Hiraga, 2003). I use these experiments to determine the
effect on the interdiffusion coefficient (via a change in grain boundary diffusivity and/or lattice diffusivity)
from the presence of the dopants. This
research will allow me to quantify the effect of incompatible elements on
kinetic processes (e.g. creep and electrical conductivity) and partial melt generation in upper
mantle rocks. |
View my CV
Teaching Experience
GEO 1001: Introduction to Geology,
laboratory teaching assistant |
GEO 3003: Geohazards,
facilitator |
GEO 3202: Geodynamics II: The Fluid Earth,
laboratory teaching assistant |
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| GEO 8980: Seminar: Jupiter's moon Io - from the
surface to the core, instructor |
GEO 5203: Mineral and Rock Physics,
teaching assistant |
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Publications
T Scott and D L Kohlstedt, The Effect of Large Melt Fraction on the Deformation Behavior of
Peridotite, Earth Planet. Sci. Lett., 246, 177-187, doi:10.1016/j.epsl.2006.04.027
J Hustoft, T Scott and D L Kohlstedt, The Effect of Metallic Melt on the
Viscosity of Peridotite, Earth Planet. Sci. Lett., 260, 355-360, doi:10.1016/j.epsl.2007.06.011
T Scott, T Hiraga, M M Hirschmann and D L Kohlstedt, The effect of grain boundary segregants on cation interdiffusivity in olivines, in
prep.
T Scott, M E Zimmerman, J T Fredrich and D L Kohlstedt, Lattice-Boltzmann Calculation of
the Permeability of MORB in Sheared Peridotite, in prep.
Honors and Awards |
| 2004-2005 V. Rama Murthy & Janice Noruk Graduate Fellowship
| 2005-2006 Richard C. Dennis Graduate Fellowship |
2005-2006 Harold Mooney Graduate Fellowship |
Selected Abstracts and Presentations
D L Kohlstedt, A M Dillman and T J Scott (2007), Grain-Grain Interfaces in Diffusion and Deformation, Eos Trans. AGU, 88(52), Fall Meet. Suppl., Abstract MR33A-01 (abstract)
T Scott and D L Kohlstedt (2005), The Effect of Large Melt Fraction on the Deformation Behavior of Peridotite, 2005 VLab Workshop, Minnesota Supercomputer Institute, Minneapolis, MN
T Scott and D L Kohlstedt (2004) The Effect of Large Melt Fraction on the Deformation Behavior of Peridotite: Implications for the Viscosity of Io's Mantle and the Rheologically Critical Melt Fraction, Eos Trans. AGU, 85(47), Fall Meet. Suppl., Abstract T13D-02 (abstract)
T Scott and D L Kohlstedt (2004), The Effect of Large Melt Fraction on the Deformation Behavior of Peridotite: Implications for the Rheology of Io’s Mantle. Lunar & Planetary Science XXXV, #1304 (abstract)
| Professional Memberships |
AGU |
APS |
GSA |