APPENDIX 1.

EXTRACTABLE Al, Fe, AND Mn ON SEDIMENTS

Core number	Altitude m	Mineral fraction	Al μmol/g)		Fe (μ mol/g)		Mn μmol/g
			Oxidative	Reductive	Oxidative	Reductive	Oxidative	Reductive
<2 mm size fraction
R23AWC02	13.4 ± 0.2	whole	33.8 ± 0.2	14.6 ± 0.5	52 ± 2	17.8 ± 0.6	0.30 ± 0.02	0.199 ± 0.017
R23AWC02	12.9 ± 0.2	whole	33 ± 7	17.5 ± 0.4	49 ± 11	22.1 ± 0.9	0.27 ± 0.13	0.236 ± 0.001
R23AWC03	13.4 ± 0.2	whole	32 ± 6	15.8 ± 0.2	45 ± 10	19.5 ± 0.4	0.23 ± 0.07	0.173 ± 0.001
R23AWC03	12.9 ± 0.2	whole	22 ± 8	17.6 ± 1.8	31 ± 12	21 ± 2	0.13 ± 0.04	0.215 ± 0.020
94UZComposite		whole	31 ± 1	20 ± 4	56 ± 5	23 ± 4	0.33 ± 0.01	0.29 ± 0.04
>2 mm size fraction
R23AWC03	13.4 ± 0.2	whole except quartz	143	74	162	71.1	1.39	0.87
R23AWC03	13.4 ± 0.2	quartz grains		22		2.37		0.050
R23AWC02	13.4 ± 0.2	whole except quartz	120	87	86	98.2	1.31	1.07
R23AWC02	13.4 ± 0.2	quartz grains		3.5		4.84		0.066