Abstract
In the present contribution, we reconstruct the marine Os isotopic composition over the past 500 ky from the metalliferous carbonates of the ODP Site 834 in the Lau Basin. The marine 187Os/188Os ratios are estimated to range from 0.824 to 0.991. There is no distinct difference in 187Os/188Os ratios between glacial and interglacial periods. Based on box model calculations, we estimate that the riverine Os flux at LGM was ~40 % of the present riverine Os flux. This decrease in riverine Os flux may have been caused by the decrease in riverine water flux due to cold and arid climate at LGM.
