Geochemistry of DSDP Hole 91-596

Geochemical analyses of sediments from the top 24.5 m of Deep Sea Drilling Project hole 596 (23°51.20'S, 169°39.27'W) show great variability in the composition of pelagic clays accumulated in the South Pacific since the late Cretaceous. Elemental associations indicate that most of this variability can be attributed to variations in abundances of six sediment end-member components: detrital (eolian), andesitic (volcanic), hydrothermal, hydrogenous, phosphate (fish debris), and biogenic silica. We develop a sedimentation model which is used to infer processes that might have influenced the accumulation rates of these components over the last 85 million years. The accumulation of eolian detritus in the South Pacific shows some similarities to that observed in the North Pacific and has been largely controlled by global climate trends in the Cenozoic. […]

对深海钻探项目596号孔（23°51.20'S，169°39.27'W）顶部24.5米沉积物的地球化学分析揭示了自白垩纪晚期以来，南太平洋积聚的浮游粘土成分的显著变化。元素组合表明，这种变异性大多可归因于六种沉积端元成分丰度的变化：碎屑（风成）、安山岩（火山）、热液、氢化物、磷质（鱼残骸）和生物成因二氧化硅。本研究建立了一个沉积模型，用以推断在过去8500万年中可能影响这些成分积累速率的过程。南太平洋风成碎屑的积累与北太平洋的观察结果存在某些相似之处，其形成主要受新生代全球气候趋势的调控。