This research used samples and data provided by the Ocean Drilling Program (ODP). The ODP is sponsored by the U.S. National Science Foundation (NSF) and participating countries under management of Joint Oceanographic Institutions (JOI), Inc. Funding for this research was provided by the U.S. Science Support Program. Randy Korotev is thanked for his assistance with INAA. This work was supported in part by the US Department of Energy (DOE) reactor sharing program at the University of Missouri Research Reactor (MURR). We are grateful to Folkmar Hauff, Holger Paulick, an anonymous reviewer, and the ODP editorial staff for their thoughtful comments, which significantly improved the manuscript.