16. Sr AND O ISOTOPIC RATIOS OF ARAGONITE VEINS FROM SITE 8951

The aragonite veins from Site 895 have been analyzed for Sr contents and Sr, carbon and oxygen isotopic compositions. The δ 18 θ values are uniform and quite high (+33.9 to 36.1%c), which suggests low formation temperature-(<7°C). The 87Sr/86Sr ratios range from 0.709136 to 0.709195 indicating that the aragonites crystallized from present-day seawater. The aragonite veins at Site 895 formed from ambient seawater after tectonic exposure of the peridotites.