Middle Miocene to recent sedimentological record of ODP sites 177-1088 and 177-1092

During Leg 177 of the Ocean Drilling Program (ODP), well-preserved Middle Miocene to Pleistocene carbonate-rich sediment records were recovered on a north-south transect through the south-eastern Atlantic sector of the Southern Ocean at Site 1088 on the Agulhas Ridge and Site 1092 on Meteor Rise. Both sites were dominated by the deposition of calcareous nannofossil oozes through the Miocene, indicating low biological productivity in warm to temperate surface waters. A continuous increase in the proportions of foraminifera since the latest Miocene (6.5 Ma) points to enhanced nutrient supply, possibly related to the global 'biogenic bloom' event across the Miocene-Pliocene boundary. Since the Late Pliocene, different styles of biological productivity developed between the sites. […]

在海洋钻探计划（ODP）的第177航次中，于南大洋东南部大西洋区域的阿古拉斯脊1088号站位和气象隆起1092号站位，沿南北走向的剖面上，成功采集到了保存完好的中新世至更新世富含碳酸盐的沉积记录。自中新世以来，这两个站位均以钙质有孔虫软泥的沉积为主，这表明温暖至温带表层的生物生产力较低。自中新世末期（约6.5百万年前）以来，有孔虫比例的持续增加表明营养物质的供应增加，这可能与中新世-上新世边界发生的全球性‘生物发生性浮游生物爆发’事件有关。自上新世晚期以来，这两个站位之间的生物生产力发展呈现出不同的模式。 [...]