Uranium-series isotope and trace element studies of ocean sediments and their application to the fields of paleoclimatology, low-temperature geochemistry, and tectonics.
Paleoclimatology |
In 2001, I participated in a collection trip for fossil corals that are currently on the ocean floor off the coast of New Guinea, up to 2,000 meters below sea level. My collaborators, Drs. Eli Silver and Donald Potts at UC Santa Cruz, and I used Jason, a remotely operated submersible, to collect the corals. These fossil corals should provide information about 1) the timing of the transitions between major glaciations and the following major interglacial periods, which occur roughly every 100,000 years, and 2) the rate of subsidence of the sea floor in this area.
Precambrian Geochronology/Tectonics |
Publications |
Webster J. M., Wallace L., Silver E., Applegate., B., Potts D., Braga J. C., Riker-Coleman K and Gallup C (In press) Drowned carbonate platforms in the Huon Gulf, Papua New Guinea, Geochemistry, Geophysics, Geosystems - G-Cubed.
Webster, J.M., Clague D.A., Riker-Coleman K., Gallup C. D., Braga J.-C., Burr G., Potts D., Moore J.G., Winterer E.L., Paull C.K. (2004) Drowning of the -150 m reef off Hawaii: A casualty of global meltwater pulse 1A? Geology 32, 249-252.
Webster, J.M., Wallace L., Silver E. Potts D., Braga J.-C., Renema W., Riker-Coleman K, Gallup C.D. (2004). Coralgal composition of drowned carbonate platforms in the Huon Gulf, Papua New Guinea; implications for lowstand reef development and drowning, Marine Geology 204, 59-89.
Edwards, R.L., Gallup, C.D., K.B. Cutler, Cheng, H., (2004). Geochemical Evidence for Quaternary Sea Level, in Treatise on Geochemistry, Eds. H.D. Holland, K.K. Turekian, Elsevier. Volume 6, Oceans and Marine Geochemistry, Ed. H. Elderfield, 343-364.
Edwards, R.L., Gallup, C.D., Cheng, H., (2003). Uranium-series Dating of Marine and Lacustrine Carbonates. Reviews in Mineralogy and Geochemistry, Vol 52, 363-405.
Cutler K.B., Edwards R.L., Taylor F.W., Cheng H., Adkins J., Gallup C.D., Cutler P.M., Burr G.S., Chappell J., and Bloom A.L. (2003). Rapid sea-level fall and deep-ocean temperature change since the last interglacial. Earth and Planetary Science Letters, 206, 253-271.
Gallup, C.D., Cheng, H., Edwards, R.L. (2002). Direct determination of the timing of sea level change during Termination II. Science, 295, 310-313.
Cheng, H., Edwards, R.L., Hoff, J.A., Gallup, C.D., Richards, D.A., Asmerom, Y. (2000). The half-lives of uranium-234 and thorium-230. Chemical Geology, 169, 17-33.
Gallup, C.D. 1997. High-precision uranium-series analyses of fossil corals and Nicaragua Rise sediments: The timing of high sea levels and the marine 234U value during the past 200,000 years. Ph.D. Thesis, University of Minnesota.
Galewsky, J., Silver, E.A., Gallup, C.D., Edwards, R.L., and Potts, D. 1996. Carbonate platform dynamics in the Huon Gulf, Papua New Guinea, Geology, 24, 819-822.
Min, G.R., Edwards, R.L., Taylor, F.W., Gallup, C.D., and Beck, J.W. 1995. Annual cycles of U/Ca in coral skeletons and U/Ca thermometry. Geochim. Cosmochim. Acta. v. 59, no. 10, pp. 2025-2042.
Gallup, C.D., Edwards, R.L., and Johnson, R.G. 1994. The timing of high sea levels over the past 200,000 years. Science 263, 796-800.
Taylor, F.W., Quinn, T., Gallup, C.D., and Edwards, R.L. 1994. Quaternary plate convergence rates at the New Hebrides Arc from the chronostratigraphy of Bougainville Guyot (Site 831). Proceedings of the Ocean Drilling Program, Scientific Results, v. 134, 47-57.
Edwards, R.L. and Gallup, C.D. 1993. Dating of the Devils
Hole calcite vein. Science 259, 1626-1627.