Pacific Ocean 39 to 41° N, 127 to 141° W

Atlantic Ocean 36° 8'N, 69° 29'W

Depth (m)

Ir (fmol/kg)

Depth (m)

Ir (fmol/kg)

25

0.498

80

0.5644

25

0.5644

25

0.9462

1000

0.7304

Anbar, A. D., Wasserburg, G. J., Papanastassiou, D. A. and

Anderson, P. S., 1996. Iridium in natural waters. Science, 273: 1524-1528.