(Table 1) Concentration of iridium at DSDP Hole 75-530A@en

The section recovered at Site 530 (Holes 530A and 530B) consists of eight sedimentary units and one basalt unit. The composition of the basalt recovered in Hole 530A is distinct from typical mid-ocean ridge basalts (MORBs) but is similar to that of Hawaiian tholeiites and basalt from the central part of Walvis Ridge. Throughout most of its history, the southern Angola Basin received large volumes of redeposited material in the form of turbidites and, most recently, debris-flow deposits. Most of this material was derived from Walvis Ridge to the south, but thickness trends of acoustic units suggest that some of the sediment was derived from the African continental margin to the east. […]