Group Members
Wendy Panero
Associate Professor
personal website
Daniel M Reaman
PhD candidate (2006-)
"Diamond" Dan performs high-pressure experimental work on deep Earth
materials using the laser-heated diamond anvil cell (LHDAC) and the
hydrothermal diamond anvil cell (HDAC). His goal is to gain a better
understanding of the structure and dynamics of these materials at
conditions of high-pressure and high temperature, reproducing
conditions present in planetary interiors. His main focus consists of
inner-core composition, micro-structure and dynamics (e.g. viscosity,
deformation mechanisms, seismic anisotropy). In addition, he and his
colleagues have developed innovative, micro-fabricated, controlled
geometry samples for use in the diamond anvil cell, as well as study
high-pressure phase changes in important uranium-bearing silicates such
as coffinite.
Panero, W. R., J. R. Smyth, S. D. Jacobsen, S. M. Thomas, D. J. Frost,
D. M. Reaman, J. S. Pigott, Crystal Structure and Compression of Hydrou
s Ringwoodite, submitted.
Grottoli, A. G., J. F. Adkins, W. R. Panero, D. M. Reaman, K. Moots, Growth rates, stab
le oxygen isotopes, and strontium (Sr/Ca) Composition of two specifies of Pacific sclerosponges: Calibration and application to paleoceanography, Journal of Geophysical Research, in press.
Zhang, F. X., V. Pointeau, L. C. Shuller, D. M. Reaman, M. Lang, Z. Liu, J. Hu, W. R. Panero, U. Becker, R. C. Ewing, Structural transitions and electronic transfer in coffinite, USiO4, at high pressure, American Mineralogist, 94, 916-920, 2009.
See Dan's
abstract from his PhD proposal
Terrilynn Easter
MS Student (2007-)
Terrilynn's primary interest is in modeling
and understanding terrestrial systems such as helictite cave
formations. Presently she uses ab-initio
calculations from VASP , thermodynamic models, and programming in MatLab to investigate solid solution systems. For her MS thesis she is using this process
in order to reproduce low pressure P-T-x phase diagrams for the halite
(NaCl)-sylvite(KCl) system. By using the theory of cluster expansion, the
question to be answered is whether experimentally measured anomolous
relationships between the thermal heat of expansion and bulk modulus
vs.composition are due to Schottky pair produced vacancies in the consolute
region of the phase diagram.
Jason Kabbes
MS student (2008-)
Jason's work is geared toward answering large-scale questions
that will increase the fundamental understanding of the Earth’s mineralogical
composition. His research is currently
aimed at quantifying mantle redox state as a function of depth and investigating
its impact on mantle mineralogy. He is
focusing on constraining the C-CO and Fe-FeO mineral redox buffers relative to
one another at high temperatures and pressures using the laser heated diamond
anvil cell. He collects data at BNL at the NSLS, as well as uses several
analytical techniques available here at Ohio State such as Focused Ion Beam
milling (FIB) coupled with STEM.
He is also
interested in elemental and oxide partitioning into the core, ƒO2 of
magma chambers beneath Iceland, and development of new techniques to measure
the ferric to ferrous ratio of iron.
Panero, W.R. and J. Kabbes. Mantle-wide sequestration of carbon in
silicates and the structure of magnesite II, Geophys. Res. Lett., 35,
L14307, doi: 10.1029/2008GL03442, 2008
Jeff Pigott
Undergraduate Group Member (2008)
MS Student (2009-)
Fluid transport times in subduction zones are constrained to first
order by the viscosity of water released during the dehydration of the
subducted slab. Water is transported from the slab into the mantle
wedge and facilitates melting. By accurately determining the viscosity
of water at elevated pressures and temperatures that are representative
of a subduction zone environment, timescales that are associated with
arc volcanism may be verified. Using a diamond anvil cell, pressures
and temperatures of subduction zones are re-created in a laboratory
environment, and coupled with particle tracking velocimetry, effective
viscosities of water at those conditions can be quantified.
Panero, W. R., J. R. Smyth, S. D. Jacobsen, S. M. Thomas, D. J. Frost, D. M. Reaman, J. S. Pigott, Crystal Structure and Compression of Hydrous Ringwoodite, submitted.
Goldsmith, S. T., A. E. Carey, B. M. Johnson, S. A. Welch, W. B.
Lyons, W. H. McDowell, J. S. Pigott, Stream geochemistry, chemical
weathering and CO2 consumption potential of andesitic terrains,
Dominica, Lesser Antilles, Geochemica et Cosmochemica Acta, 74,
85-103, 2010.
Eugenia Hyung
Honors Undergraduate Thesis Student (2008-2010)
Eugenia is working on analyzing various x-ray diffraction data of
rubidium hollandite (a high pressure state of feldspar) and rubicline
under high pressures similar to that of the Earth's lower mantle in
order to find the behavior and sense of stability of that may well
store potassium. She is also working on a project to improve the
calibration of temperatures of various metals by measuring
wavelength-dependent emissivities.
Graduates!
Sara Whitaker
MS student (2007-2009)
Sara is investigated the potential for potassium and rubidium^Min Earth's core and how these radiogenic isotopes might affect Earth's heat budget. An important aspect of this is the determination of how iron oxidation effects the absorption of rubidium and potassium into the iron. She found that the surface oxidation on 1 micron iron powder is sufficient to drive significant uptake of these alkali metals into the iron. To do this, she used the LHDAC and Brookhaven National Laboratory (BNL) at the National Synchrotron Light Source (NSLS) and HPCAT at the Advanced Photon Source (APS) at Argonne National Lab.
OSU
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