University of California, Riverside

Department of Earth Sciences

Martin J. Kennedy


Ph.D., University of Adelaide, Australia, 1994

Specialty: Sedimentary geology and geochemistry

Phone: (951) 827-2025
Office: Geology 464
Link to Homepage

Research Interests:
My research and teaching interests lie in paleooceanographic and paleoclimate events recorded in the stratigraphic record, particularly focused on controls of the ancient carbon cycle and biogeochemical feedbacks within the biosphere. I utilize an integrated field-stratigraphic and isotope-geochemical approach and maintain a well-equipped sedimentary geochemical lab capable of preparing samples for a broad range of analyses including stable and radiogenic isotope analysis and quantitative analysis of clay minerals with our X-ray diffraction facility. My current research is focused on oceanographic events surrounding Neoproterozoic glaciation and biotic events and the oceangraphic controls on organic carbon burial and deposition of black shales. I am interested in changes in geochemical cycles through planetary evolution and its potential influence on life. In addition I maintain and active interest in modern and quaternary biogeochemical systems as well as tertiary sedimentary environments in California.

All of my projects are strongly field oriented, but supplemented with a wide variety of geochemical techniques. The integration of different types of data with concepts incorporated from both modern and ancient environments is most interesting to me.

Recent Projects:

Integrated sedimentological, stratigraphic and geochemical studies of late Precambrian glacial successions in Namibia and Australia. Geochemical, mineralogical, and sedimentological studies of organic rich rocks to determine the paleoceanographic controls and the biogeochemistry of organic matter deposition and preservation. Isotopic studies of modern soils, plants and water in Patagonia and Hawaii.

Selected Publications:

Kennedy, Martin, Mrofka, David D., 2008, Snowball Earth termination by destabilization of equatorial permafrost methane clathrate. Nature. v. 453, p. 642-645.

Fairchild, I.J., and Kennedy, M.J., 2007, Neoproterozoic glaciation in the Earth system. Journal of the Geological Society, Centennial Issue, v. 164, p. 895-921.

Kennedy, Martin, Droser, Mary, Mayer, Larry M., Pevear, David, Mrofka, David D., 2006, Late Precambrian Oxygenation; Inception of the Clay Mineral Factory. Science. v. 311, p. 1446-1449.

Jiang, G., Kennedy, M.J., Christie-Blick, N., Huaichun, W., and Shihong, Z., 2006, Stratigraphy, Sedimentary Structures, and Textures of the Late Neoproterozoic Doushantuo Cap Carbonate in South China. Journal of Sedimentary Research, v. 76 p. 978-995.

Jiang, G., Kennedy, M.J., Christie-Blick, N., 2003, Stable isotope evidence for methane seeps in Neoproterozoic postglacial cap carbonates. Nature. v. 426, p.822-826.

Ridgewell, A., Kennedy, M.J., Caldera, K., 2003, Carbonate deposition, climate stability, and Neoproterozoic ice ages. Science. v. 302, p. 859-862.

Ridgewell, A., and Kennedy, M.J., 2004, Secular changes in the importance of neritic carbonate deposition as a control on the magnitude and stability of Neoproterozoic ice ages. American Geophysical Union Mongograph Series. Extreme Proterozoic Environmental Conditions, Jenkins, G. and Sohl, L. eds. v. 146. p. 55-72.

Kennedy, M.J., Hedin, L.O. and Derry, L.A., 2001, Unpolluted temperate forests are nutritionally decoupled from weathering sources, PNAS, v.99, p. 9639-9644.

Kennedy, M.J., Christie-Blick, N., Prave, T., 2001, Carbon isotopic composition of Neoproterozoic glacial carbonates as a test of paleoceanographic models for snowball Earth phenomena Geology, v 29, p. 1135-1138.

Kennedy, M.J., Christie-Blick, N., Sohl, L., 2001, Are Proterozoic cap carbonates and isotopic excursions a record of gas hydrate destabilization following Earth's coldest intervals? Geology. v. 29, p.443-446.

Kennedy, M.J., Runnegar, B., Prave, A.R., Hoffmann, C., and Arthur, M.A., 1998. Two or four Neoproterozoic glaciations. Geology, Special Report, V. 26, p. 1059-1063.

Christie-Blick, N., Sohl, L., Kennedy, M.J., Hoffman, P. and Schrag, D., 1999. Considering a Neoproterozoic snowball earth. Science, V. 284 no. 5417.

Kennedy, M.J., Chadwick, O.E., Vitousek P.A., Derry, L.A. and Hendricks D., 1998 Changing sources of base cations during ecosystem development, Hawaiian Islands. Geology. V. 26, p. 1015-1018.

Vitousek, P.A., Kennedy, M.J., Derry, L.A., Chadwick, O.E., 1999. Weathering versus atmospheric sources of strontium in ecosystems on young volcanic soils. Oecologia, V. 121, p. 255-259

Kennedy, M.J. 1996. Deglaciation, d13C excursions and carbonate precipitation: Isotopic geochemistry, stratigraphy and sedimentology of Australian Neoproterozoic post-glacial cap-dolostones. Journal of Sedimentary Research, 66, pp. 1049-1063.

Kennedy, M.J. 1993. The Undoolya sequence; a new stratigraphic unit syn-depositionaly deposited adjacent to a late Proterozoic salt structure; Amadeus Basin, Central Australia. Australian Journal of Earth Science, 40, part 4, pp. 217-228.


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