Trace metals of interstitial waters of ODP Leg 116 samples

Trace metals, for which we detected no pollution due to drilling and pore-water extraction procedures, are studied in the pore waters of Ocean Drilling Program Leg 116 sediments. Strontium is controlled by dissolution of biogenic carbonates. Barium is controlled by barite and diagenesis. Manganese is controlled by organic matter diagenesis and carbonate. Copper is controlled by hyperfiltration-osmotic effects in alternating clay-sand units. In addition, barium, manganese, and copper are also enriched by upwelling of hot water and its expansion and flow through permeable layers.