Greg Ravizza

TL;DR: Records of the global stratigraphy across this boundary are synthesized to assess the proposed causes of the Cretaceous-Paleogene boundary and conclude that the Chicxulub impact triggered the mass extinction.

TL;DR: A review of the marine osmium isotope system can be found in this article, where the authors summarize the current understanding of the ocean environment and present and past Osmium system.

TL;DR: In this paper, the authors show that dissolved Ba concentration is not an important factor in regulating the flux of bio-Ba to the seafloor, and instead, the high Corg/bio-Ba ratios found in the western Atlantic, the Panama Basin, the Arabian Sea, and some stations in the Nordic Seas result from the addition of refractory organic carbon from nearby continents, shelves, or slopes.

TL;DR: The decay of 187Re to 187Os provides a tool for determining depositional ages of black shales as mentioned in this paper, which is consistent with postdepositional mobilization of Re and/or Os on a small spatial scale.

TL;DR: In this article, a composite Os isotope seawater evolution curve over the past 80 m.y.y was constructed based on new187Os/186Os data and Re and Os concentrations in metalliferous sediments from the Pacific.