Median grain size and distribution of sand in ODP Hole 108-660A (Fig. 5)@en

50 m of Middle Eocene pure radiolarian ooze were drilled at ODP Site 660 in the equatorial East Atlantic, 80 km northeast of the Kane Gap. The oozes comprise a 10 m high and 2 km broad mound of seismic reverberations, covered by manganese-rich sediment, and contain trace amounts of sponge spicules and diatoms, negligible organic carbon (0.15%), clay, and variable amounts of pyrite. The yellow to pale brown silty sediments are relatively coarse-grained (30–45% coarser than 6 µm), little bioturbated, and commonly massive or laminated on a cm-scale. […]

在东大西洋赤道海域、凯恩缺口（Kane Gap）东北80公里处的大洋钻探计划（Ocean Drilling Program，ODP）660站位，钻取了50米厚的中始新世纯放射虫软泥（radiolarian ooze）。该套软泥体形成了一座高10米、宽2千米的地震混响丘状体，表面覆盖富锰沉积物；其中含有微量海绵骨针与硅藻，有机碳含量仅为0.15%，处于可忽略水平，另有黏土与含量波动的黄铁矿。这套呈黄色至浅棕色的粉砂质沉积物粒度相对较粗（30%~45%的颗粒粒径大于6微米），生物扰动程度较弱，通常呈块状或厘米级纹层状构造。[...]