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Chemical composition determined at three interfaces comparable to that featured in Figure 6a. Only the stated elements were included in the analysis and the values were averaged from at least five spots analyzed at each interface. The average Ca/Si ratio is also stated for each interface.
| in wt % | O | Na | Mg | Al | Si | K | Ca | Fe | Si/Ca |
|---|---|---|---|---|---|---|---|---|---|
| interface 1 | 48 | 12 | 1 | 5 | 29 | 2 | 3 | 1 | 10:1 |
| interface 2 | 50 | 5 | 0 | 6 | 34 | 3 | 2 | 1 | 20:1 |
| interface 3 | 50 | 5 | 0 | 6 | 33 | 2 | 1 | 1 | 27:1 |
