Lawrence Livermore National Laboratory

Jeff Roberts

Senior Scientist - Alternative Resource Cycle, E-Program
Atmospheric, Earth and Energy Division

 +1 925-422-7108

Ph.D. Geology/Mineral Physics
Arizona State University
B.S. Applied Science
University of Texas, San Antonio

Research Interests

Transport properties of minerals and partial-melts, electrical properties, defect chemistry, and microscale imaging. This knowledge is applied to key Earth science questions such as the nature and timing of planetary core formation, state and composition of the crust and mantle, fluid-flow in porous media, and near-surface geophysics.

Selected Publications

Wright, H. M. N, K. V. Cashman, E. H. Gottsfeld, and J. J. Roberts, Pore Structure of Volcanic Clasts: Measurements of Permeability and Electrical Conductivity, EPSL, doi:10.1016/j.epsl.2009.01.023, 2009.

Mathez, E. A., J. J. Roberts, A. G. Duba, A. K. Kronenberg, and S. L. Karner, Carbon deposition during brittle rock deformation: Changes in electrical properties of fault zones and potential geoelectric phenomena during earthquakes, J. Geophys. Res.., 113, B12, B12201, 2008.

Sweeney, H. J., J. J. Roberts, and P. E. Harben, A Study of the Dielectric Properties of Dry and Saturated Green River Oil Shale, Energy & Fuels, 7, 150-158, doi:10.1021/ef070150w, 2007.

Kuntz, J. D., J. J. Roberts, M. Hough, and N. J. Cherepy, Multiple synthesis routes to transparent ceramic lutetium aluminum garnet, Scripta Materilia, 57, no. 10, 960-963, doi:10.1016/j.scriptamat.2007.07.017, 2007.

Roberts, J.J., J. Siebert, F. J. Ryerson, and J. H. Kinney, Fe-Ni-S Melt Permeability in Olivine: Implications for Planetary Core Formation, Geophys. Res. Lett, 34, L14306, doi:10.1029/2007GL030497, 2007.

Wright, H. M. N., J. J. Roberts, and K. V. Cashman (2006), Permeability of anisotropic tube pumice: Model calculations and measurements, Geophys. Res. Lett., 33, L17316, doi:10.1029/2006GL027224.

Du Frane, W. L., J. J. Roberts, D. A. Toffelmier and J. A. Tyburczy, Anisotropy of electrical conductivity in dry olivine, Geophys. Res. Lett., 32, L24315, 2005.

Park, S.K., and J.J. Roberts, Conductivity structure of the San Andreas fault, Parkfield, revisited, Geophys. Res. Lett., 30, No. 16, 1842, 2003

Roberts, J. J., Electrical properties of microporous rock as a function of saturation and temperature, J. Applied Phys., 21, 1687-1694, 2002.

Wildenschild, D., J. J. Roberts and E. D. Carlberg, Electrical Properties of Sand-Clay Mixtures: The Effect of Microstructure, Geophys. Res. Lett., 27, 3085-3089, 2001, also Rep. UCRL-JC-135208, Lawrence Livermore National Laboratory, Livermore, CA, 2000.

Roberts, J. J., and J. A. Tyburczy, Partial-Melt Electrical Conductivity: Influence of Melt Composition, J. Geophys. Res., 104, 7055-7065, 1999.

Roberts, J. J., A. G. Duba, E. A. Mathez, T. J. Shankland, and R. Kinzler, Carbon-Enhanced Electrical Conductivity During Fracture of Rocks, J. Geophys. Res., 104, 737-747, 1997.

Roberts, J. J., and W. Lin, Electrical Properties of Partially Saturated Topopah Spring Tuff: Water Distribution as a Function of Saturation, Water Resources Research, 33, 577-587, 1997.

Constable, S. C., and J. J. Roberts, Simultaneous Modeling of Thermopower and Electrical Conduction in Olivine, Phys. Chem. Minerals, 24, 319-325, 1997.

Roberts, J. J., and A. Duba, Transient Electrical Response of San Quintin Dunite as a Function of fO2 Changes: Information about Charge Carriers, Geophys. Res. Letters, 22, 453-456, 1995.

Roberts, J. J., and J. A. Tyburczy, Frequency Dependent Electrical Properties of Minerals and Partial-Melts, INVITED PAPER, Surveys in Geophys., 15, 239-262, 1994.

Roberts, J. J., and J. A. Tyburczy, The Frequency Dependent Electrical Properties of Dunite as Functions of Temperature and Oxygen Fugacity, Phys. Chem. Minerals, 19, 545-561, 1993.

Roberts, J. J., and J. A. Tyburczy, Impedance Spectroscopy of Single and Polycrystalline Olivine: Evidence for Grain Boundary Transport, Phys. Chem. Minerals, 20, 19-26, 1993.

Roberts, J. J., and J. A. Tyburczy, Frequency Dependent Electrical Properties of Polycrystalline Olivine Compacts, J. Geophys. Res., 96, 16205-16222, 1991.

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