Group Members 





Wendy at work Wendy aligning lasers in the lab

Wendy Panero
Associate Professor
personal website


Dan working on one of his plots to take over the world

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


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 loading LHDAC 

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

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

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

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.  




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