Research Article
A Deep Alteration and Oxidation Profile in a Shallow Clay Aquitard: Example of the Tégulines Clay, East Paris Basin, France
Table 3
Distribution and iron speciation in iron-bearing minerals of well-preserved reduced Tégulines Clay and weathered Tégulines Clay.
| | Minerals | Mineral content (wt%) | Fe2+/total Fe ratio | Total Fe mmole/100 g of rock | Total Fe2+ mmole/100 g of rock | Fe carried by the mineral/total Fe |
| | Reduced Tégulines Clay | | Pyrite | 0.9 | 1.0 | 7.5 | 7.5 | 10.4 | | Siderite | 0.5 | 1.0 | 3.1 | 3.1 | 4.3 | | Goethite | 0.7 | 0.0 | 7.9 | 0.0 | 11.0 | | Glauconite | 9.0 | 0.8 | 25.0 | 20.0 | 34.8 | | Clay (Ill + Ill-Sm, Sm-Chl) | 28.0 | 0.8 | 28.4 | 23.7 | 39.5 | | Bulk rock | | 0.8 | 71.9 | 54.3 | 100.0 | | Oxidized Tégulines Clay | | Pyrite | 0.1 | 1.0 | 0.8 | 0.8 | 1.2 | | Siderite | 0.5 | 1.0 | 3.1 | 3.1 | 4.3 | | Goethite | 2.0 | 0.0 | 20.8 | 0.0 | 28.9 | | Glauconite | 9.0 | 0.2 | 18.8 | 3.8 | 26.1 | | Clay (Ill + Ill-Sm, Sm-Chl) | 28.0 | 0.2 | 28.4 | 5.7 | 39.5 | | Bulk rock | | 0.2 | 71.9 | 13.4 | 100.0 |
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