This study was supported by grants No. F000221 and F000394 from JOI/USSP/TAMRF ODP Leg 165 to André W. Droxler. We thank the crew and scientists aboard the JOIDES Resolution and the technical personal at the core repository in Bremen (Germany). Dennise Rodriguez and Christine Reif helped with sample preparation and analyses. Stable isotopic analyses were performed in the laboratory of Dr. Howie Spero at UC Davis. The manuscript greatly benefited from the critical comments of Dr. Mark Leckie, Dr. Mitch Lyle, Susan Swanson, and an anonymous referee. This research comprises the master's thesis of the senior author (Roth, 1998).