Figure F36. Variations of LOI (loss on ignition) and K2O abundances and Cu/Zr, Co/Zr, and Zn/Zr ratios with depth in the Hole 1204A sequence. Also shown is the core recovery downhole. Green = sedimentary units, yellow = volcaniclastic units, blue = lava flow units, brown = oxidizing alteration zones, gray green = reducing alteration zones.