Table 4.
Porewater water chemistry from Seaplane Lagoon, Alameda NAS compared with sulfide, carbonate, phosphate, silicate, oxide, and hydroxide minerals reported as the saturation index at 25°C (log SI). Calculations used trace and major elements; sulfide and sulfate are from core SC4 and total inorganic carbon is from core SC2
| Sulfides | |||||||||||||||||||
| Sample ID | Depth/cm | CdS | CrS | CuS covellite | CuFeS2 chalcopyrite | FeS2 pyrite | FeS pyrrhotite | MnS alabandite | NiS millerite | PbS galena sphalerite | ZnS | ||||||||
| SC4-1 | 1.5 | -0.1 | -16.2 | 7.4 | 14.4 | 8.9 | 1.0 | -3.0 | 2.4 | -1.3 | 4.0 | ||||||||
| SC4-2 | 4.5 | -0.1 | -15.1 | 7.5 | 14.0 | 9.1 | 0.9 | -3.2 | 2.5 | -0.8 | 3.9 | ||||||||
| SC4-3 | 7.5 | 1.2 | -15.0 | 7.3 | -2.7 | 3.0 | -0.4 | 3.56 | |||||||||||
| SC4-4 | 10.5 | 0.6 | -13.8 | 10.9 | -2.5 | 3.0 | -0.1 | 3.6 | |||||||||||
| SC4-5 | 13.5 | 0.2 | -15.1 | 7.9 | -2.6 | 5.6 | 2.2 | 5.0 | |||||||||||
| SC4-6 | 16.5 | -0.2 | -14.9 | 8.1 | -2.4 | 2.7 | -0.4 | 3.8 | |||||||||||
| SC4-7 | 19.5 | -0.1 | -15.0 | 7.7 | -2.8 | 2.5 | -0.4 | 3.9 | |||||||||||
| SC4-8 | 22.5 | 0.2 | -14.9 | 8.3 | -3.0 | 2.6 | -0.4 | 3.9 | |||||||||||
| SC4-9 | 25.5 | -15.0 | 7.9 | -3.7 | -0.7 | 3.9 | |||||||||||||
| SC4-10 | 28.5 | 0.0 | -15.2 | 7.3 | -4.6 | 2 2 | -0.5 | 4.0 | |||||||||||
| SC4-11 | 31.5 | 0.6 | -14.6 | 7.7 | -4.9 | 2.6 | -0.2 | 3.8 | |||||||||||
| SC4-12 | 34.5 | 0.6 | -14.4 | 7.7 | 2.5 | 0.2 | 3.8 | ||||||||||||
| Carbonates | |||||||||||||||||||
| Sample ID | Depth/cm | CaCO3calcite | CdCO3 otavite | Cu2CO3(OH)2 malachite | FeCO3 siderite | MnCO3 rhodochrosite | NiCO3 | PbCO3 cerussite | ZnCO3 smithsonite | ||||||||||
| SC4-1 | 1.5 | -1.1 | -16.2 | -29.5 | -4.5 | -5.2 | -11.1 | -14.9 | -9.9 | ||||||||||
| SC4-2 | 4.5 | -0.8 | -16.1 | -29.0 | -4.5 | -5.3 | -11.0 | -14.4 | -9.9 | ||||||||||
| SC4-3 | 7.5 | 0.9 | -13.5 | -27.7 | -3.5 | -9.2 | -12.6 | -8.9 | |||||||||||
| SC4-4 | 10.5 | 1.1 | -14.0 | -20.2 | -3.1 | -9.0 | -12.2 | -8.7 | |||||||||||
| SC4-5 | 13.5 | 0.8 | -14.7 | -26.9 | -3.5 | -6.6 | -10.1 | -7.6 | |||||||||||
| SC4-6 | 16.5 | 1.0 | -14.9 | -26.5 | -3.2 | -.95 | -12.6 | -8.8 | |||||||||||
| SC4-7 | 19.5 | 0.9 | -14.8 | -27.4 | -3.6 | -9.6 | -12.6 | -8.6 | |||||||||||
| SC4-8 | 22.5 | 1.1 | -14.4 | -26.1 | -3.6 | -9.4 | -12.5 | -8.5 | |||||||||||
| SC4-9 | 25.5 | 0.9 | -27.0 | -4.3 | -12.8 | -8.5 | |||||||||||||
| SC4-10 | 28.5 | -0.5 | -15.8 | -29.4 | -6.4 | -10.9 | -13.8 | -9.6 | |||||||||||
| SC4-11 | 31.5 | 1.3 | -13.8 | -27.1 | -5.4 | -9.3 | -12.1 | -8.4 | |||||||||||
| SC4-12 | 34.5 | 1.3 | -13.7 | -26.9 | -9.2 | -11.6 | -8.3 | ||||||||||||
| Silicates | |||||||||||||||||||
| Sample ID | Depth/cm | PbHPO4 | Ca5OH(PO4)3 apatite | Pb5PO4Cl3 pyromorphite | β-Zn(OH)2 | SiO2 quartz | SiO2 β-cristobalite | Mg5Al2Si3010(OH)8 7A-chlorite | |||||||||||
| SC4-1 | 1.5 | -11.6 | 1.8 | -55.5 | -10.1 | 0.7 | -0.3 | -0.1 | |||||||||||
| SC4-2 | 4.5 | -11.4 | 2.5 | -53.9 | -10.1 | 0.8 | 0.2 | 2.8 | |||||||||||
| SC4-3 | 7.5 | -11.2 | 4.6 | -51.8 | -9.8 | 0.6 | -0.4 | 5.5 | |||||||||||
| SC4-4 | 10.5 | -10.9 | 5.1 | -50.3 | -9.6 | 0.7 | -0.3 | 7.2 | |||||||||||
| SC4-5 | 13.5 | -8.6 | 3.5 | -39.5 | -8.9 | 0.8 | -0.2 | 3.8 | |||||||||||
| SC4-6 | 16.5 | -11.2 | 4.3 | -52.5 | -10.1 | 0.7 | -0.3 | 5.1 | |||||||||||
| SC4-7 | 19.5 | -11.2 | 3.5 | -52.6 | -10.1 | 0.8 | -0.2 | 4.3 | |||||||||||
| SC4-8 | 22.5 | -11.2 | 4.1 | -52.6 | -10.1 | 0.8 | -0.2 | 4.5 | |||||||||||
| SC4-9 | 25.5 | -11.5 | 3.6 | -52.3 | -10.2 | 0.8 | -0.2 | 3.8 | |||||||||||
| SC4-10 | 28.5 | -10.7 | 2.8 | -53.1 | -10.3 | 0.8 | -0.2 | 3.6 | |||||||||||
| SC4-11 | 31.5 | -10.9 | 4.3 | -51.5 | -10.2 | 0.8 | -0.2 | 4.7 | |||||||||||
| SC4-12 | 34.5 | -10.5 | 4.2 | -51.2 | -10.1 | 0.8 | -0.3 | 5.2 | |||||||||||
| Oxides/hydroxides/phosphates | |||||||||||||||||||
| Sample ID | Depth/cm | A1(OH)3gibbsite | Cd(OH)2 | Cr2O3 eskolaite | CuO tenorite | Fe(OH)2 | FeOOH goethite | Ni(OH)2 | Mn(OH)2 | MnHPO4 | Pb3-(PO4)2 | Ni3-(PO4)2 | Mn3- (PO4)2 | Cd3-(PO4)2 | Cu3(PO4)2 | Zn3(PO4)24H2O hopeite | FePO4. 2H2O strengite | FeCr2O4 chromite | MgCr2O4 magnesio-chromite |
| SC4-1 | 1.5 | 0.6 | -20.4 | -1.0 | -13.8 | -7.3 | -4.6 | -9.1 | -9.4 | -1.2 | -41.4 | 23.1 | -22.7 | -53.0 | -47.0 | -24.6 | -13.2 | 8.3 | 4.8 |
| SC4-2 | 4.5 | 0.9 | -20.4 | 1.8 | -13.6 | -7.3 | -4.4 | -8.9 | -9 5 | -1.6 | -40.8 | -23.5 | -23.8 | -53.5 | -47.1 | -25.4 | -13.4 | 0.9 | 0.9 |
| SC4-3 | 7.5 | 0.0 | -18.4 | 4.3 | -13.2 | -7.8 | -8.4 | -1.4 | -39.2 | -22.0 | -22.2 | -49.5 | -47.9 | -26.5 | 4.4 | ||||
| SC4-4 | 10.5 | 0.3 | -19.0 | 7.0 | -9.5 | -7.7 | -8.1 | -1.2 | -38.2 | -21.8 | -21.4 | -51.5 | -37.0 | -26.1 | 7.2 | ||||
| SC4-5 | 13.5 | 0.2 | -20.0 | 2.3 | -13.1 | 5./ | -8.8 | -1.3 | -32.6 | -14.6 | -22.3 | -53.3 | -46.4 | -22.6 | 2.0 | ||||
| SC4-6 | 16.5 | 0.4 | -20.3 | 3.1 | -12.8 | -8.5 | -8.6 | -1.2 | -39.6 | -23.2 | -21.9 | -54.3 | -45.9 | -26.3 | 3.0 | ||||
| SC4-7 | 19.5 | 0.7 | -20.4 | 5.4 | -13.4 | -8.8 | -9.1 | -1.5 | -39.7 | -23.7 | -23.0 | -54.2 | -47.2 | -26.0 | 5.0 | ||||
| SC4-8 | 22.5 | 0.4 | -20.0 | 2.8 | -12.8 | -8.7 | -9.2 | -1.6 | -39.5 | -23.5 | -23.4 | -53.0 | -45.3 | -26.0 | 2.5 | ||||
| SC4-9 | 25.5 | 1.0 | 1.8 | -13.3 | -10.1 | -2.0 | -40.0 | -25.1 | -45.9 | -25.3 | 1.1 | ||||||||
| SC4-10 | 28.5 | 1.8 | -20.5 | 0.8 | -14.0 | -9.4 | -11.2 | -2.7 | -39.1 | -23.8 | -27.5 | -52.9 | -47.2 | -24.8 | -0.3 | ||||
| SC4-11 | 31.5 | 0.5 | -19.6 | 3.3 | -13.4 | -8.8 | -11.2 | -3.5 | -38.8 | -23.5 | -29.1 | -51.7 | -47.0 | -26.1 | 3.0 | ||||
| SC4-12 | 34.5 | 0.8 | -19.6 | 3.7 | -13.3 | -8.8 | -37.6 | -23.6 | -51.6 | -46.8 | -25.9 | 3.4 | |||||||