Sr and O Isotopic Ratios of Aragonite Veins from Site 895

Abstract

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 87 Sr/ 86 Sr 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.