Publications

Presence of clay minerals can obscure spectral evidence of Mg sulfates: Implications for orbital observations of Mars.

R. Y. Sheppard, R. E. Milliken, & K. M. Robertson. (2022) Icarus. 383, 115083.

Preservation biases are pervasive in Holocene paleofire records

R. S. Vachula, R. Y. Sheppard, & A. H. Cheung. (2022) Palaeogeography, Palaeoclimatology, Palaeoecology. 602, 111165.

Chirality in organic and mineral systems: A review of reactivity and alteration processes relevant to prebiotic chemistry and life detection missions

C. Lee, J. M. Weber, L. E. Rodriguez, R. Y. Sheppard, L. M. Barge, E. L. Berger, & A. S. Burton. (2022) Symmetry special issue, “Chirality, Prebiotic Chemistry, and the Origins of Life.”

Database on carbon reduction: Implications for future research

M. Prakash, J. M. Weber, L. E. Rodriguez, R. Y. Sheppard, L. M. Barge. (2022) International Journal of Astrobiology, 1-18.

Merging perspectives on secondary minerals on Mars: A review of ancient water-rock interactions in Gale crater inferred from orbital and in situ observations

R. Y. Sheppard, M. T. Thorpe, A. A. Fraeman, V. K. Fox, R. E. Milliken. (2021) Minerals special issue, “Expanding Views of Clays, Oxides, and Evaporites on Aquaplanets in the Solar System.” 11(986).

Iron mineralogy and sediment color in a 100 m drill core from Lake Towuti, Indonesia reflect catchment and diagenetic conditions

R. Y. Sheppard, R. E. Milliken, J. M. Russell, M. D. Dyar, E. Sklute, H. Vogel, M. Melles, S. Bijaksana, A. K. M. Hasberg, & M. A. Morlock. (2021) Geochemistry, Geophysics, Geosystems. 22, e2020GC009582.

Updated Perspectives and Hypotheses on the Mineralogy of Lower Mt. Sharp, Mars, as seen from Orbit

R. Y. Sheppard, R. E. Milliken, Y. Itoh, & M. Parente. (2020) Journal of Geophysical Research: Planets. 126.

The Late Quaternary tectonic, biogeochemical, and environmental evolution of ferruginous Lake Towuti, Indonesia

J. Russell, H. Vogel, S. Bijaksana, M. Melles, A. Deino, A. Hafidz, A. Hasberg, M. Morlock, T. von Rintelen, R. Y. Sheppard, B. Stelbrink, & J. Stevenson. (2020) Palaeogeography, Palaeoclimatology, Palaeoecology. 556, p. 109905.

Characterization of iron in Lake Towuti sediment

R. Y. Sheppard, R. E. Milliken, J. M. Russell, M. D. Dyar, E. Sklute, H. Vogel, M. Melles, S. Bijaksana, A. K. M. Hasberg, & M. A. Morlock. (2019) Chemical Geology. 512, pp. 11-30.

Porosity and salt content determine if subduction can occur in Europa’s ice shell

B. C. Johnson, R. Y. Sheppard, A. C. Pascuzzo, E. A. Fisher, & S. E. Wiggins. (2017) Journal of Geophysical Research: Planets. 122.

Organic thermal maturity as a proxy for frictional fault heating: experimental constraints on methylphenanthrene kinetics at earthquake timescales

R. E. Sheppard, P. J. Polissar, & H. M. Savage. (2015) Geochimica et Cosmochimica Acta. 151, pp. 103-116.

Biomarkers heat up during earthquakes: New evidence of seismic slip in the rock record

H. M. Savage, P. J. Polissar, R. Sheppard, C. D. Rowe, & E. E. Brodsky. (2014) Geology. 42(2), pp. 99-102.