Department of Geology and Geophysics People

Additional Information

Reseach Topics:
  The marine osmium isotope record and the geologic history of chemical weathering.
 Anthropogenic influences on the geochemical cycles of the platinum group elements.
 Impact events and chemical signatures of extraterrestrial matter in marine sediments
 The biogeochemistry of molybdenum in the marine environment
 The geochemistry of recent and ancient metalliferous sediments

Courses Commonly Taught: Undergraduate
  GG 101 Dynamic Earth
  GG 200 Geologic Inquiry
  GG425 Environmental Geochemistry
Graduate
Directed Readings in Analytical Geochemistry (GG711) 

Recent Publications:
Ravizza, G., (2007) Reconstructing the marine 187Os/188Os record and the particulate    flux of meteoritic osmium during the late Cretaceous: results from ODP 886C. Geochimica et Cosmochimica Acta 71: 1355-1369.

Dalai, T. K., and Ravizza, G., (2006) Estimation of sediment accumulation rates using iridium concentrations of marine sediments in: An assessment from Os isotope and platinum group element records from the Ontong Java Plateau. Geochimica et Cosmochimica Acta 70: 3928-3942.

Dalai, T. K., Ravizza, G., and Peucker-Ehrenbrink, B. (2006) The Late Eocene 187Os/188Os excursion: chemostratigraphy, cosmic dust flux and the early Oligocene glaciation. Earth and Planetary Science Letters. 241:477-492.

Tuit, C., Waterbury J. amd Ravizza, G.  (2004) Diel variation of molybdenum and iron in marine diazotrophic cyanobacteria. Limnology & Oceanography. 49: 978-990.

Ravizza, G. and Zachos, J. C. (2003) Records of Cenozoic Ocean Chemistry. In Treatise on Geochemistry, Vol. 6 “The Oceans and Marine Geochemistry” Volume Editor H. Elderfield, Elsevier Science.

Ravizza, G., and Peucker-Ehrenbrink, B. (2003) Chemostratigraphic evidence of Deccan volcanism from the marine Os isotope record. Science 302:1392-1395.

Ravizza, G., and Peucker-Ehrenbrink, B. (2003) The marine 187Os/188Os record of the Eocene-Oligocene transition: the interplay of weathering and glaciation. Earth and Planetary Science Letters. 210: 151-165.

Cave, R.R., Ravizza G., German, C.R., Thomson, J., and Nesbitt, R. W. (2003) Deposition of Osmium and other Platinum-Group elements beneath the ultramafic-hosted Rainbow hydrothermal plume. Earth and Planetary Science Letters. 210: 65-79.