(Table 2) Chemical composition of metalliferous sediments from DSDP Hole 34-319@en

Data have been corrected to a salt and CaCO3 free basis except for Ca. Leaching has been carried out by shaking 100 mg fractions in a 3.0 pH mixture of 0.2 M ammonium oxalate and 0.2 M oxalic acid for 2 hours in the dark. This procedure removes amorphous ferric hydroxides and poorly crystalline ferromanganese hydroxides, but does not attack crystalline goethite.除钙（Ca）外，所有数据均已校正至不含盐类与碳酸钙（CaCO3）的基准体系。本实验采用浸提方法：将100毫克样品分样置于pH为3.0的0.2 mol/L草酸铵与0.2 mol/L草酸混合液中，于黑暗条件下振荡2小时。该浸提流程可去除无定形氢氧化铁与低结晶度铁锰氢氧化物，但不会溶解结晶态针铁矿。