The authors would like to thank the technicians and crew of the JOIDES Resolution who participated in Leg 201. This manuscript was greatly improved by the suggestions of Joris Gieskes, George Claypool, and Jay Miller. Arthur J. Spivack was supported by the NASA Astrobiology Institute. This research used samples and/or data provided by the Ocean Drilling Program (ODP). ODP is sponsored by the U.S. National Science Foundation (NSF) and participating countries under management of Joint Oceanographic Institutions (JOI), Inc.