Periods of time characterized by widespread accumulation of organic carbon (Corg) -rich deposits have been interpreted to form as a result of increased rates of marine primary production and oxygen-deficient conditions in bottom and pore waters. Yet, debates persist regarding the source of nutrients (in particular phosphorus (P)) to marine...
Several surface wave tomographic studies of the upper mantle structure beneath North America are presented, which take advantage of high quality seismic data, primarily recorded in the last decade, to create better resolved S-wave tomographic models. The first study presents a regional 3D model, IL05, of the upper mantle beneath...
Consumption of CO2 by chemical weathering is one of the major fluxes in the global carbon cycle that drives long-term climate. In an effort to understand silicate weathering, which is a net sink of CO2 over geological time scales, as a function of environment (e.g., exposure of parent rocks, climate,...
Continental weathering and organic carbon (OC) burial in marine sediments are important processes because they act as sinks for atmospheric carbon dioxide. Continental weathering products provide information about provenance, marine sediment quality/quantity, denudation and continental crust composition. In this study I explore two topics that impact some of these issues...