(Table 1) Carbon content and petroleum potential at DSDP Hole 73-520

At the end of the Leg 73 cruise, at Site 520, a thick upper Miocene facies of laminated diatomite was discovered. It was hypothesized that the sediment was derived from nutrient-rich waters in a young Cenozoic anoxic basin in the open Atlantic Ocean near the Mid-Atlantic Ridge.

在第73航次科考结束之际，于520站位发现了一套厚层纹层状上中新统硅藻土岩相。此前有假说认为，该沉积物源自大西洋中脊附近开阔大洋中一处新生代年轻缺氧盆地内的富营养水体。