Table T3. Characteristic X-ray diffraction peaks for semiquantitative area analysis.
| Mineral | Reflection | d-value (Å) |
Peak position (°2θ) |
|---|---|---|---|
| Composite clay | Multiple | 4.478 | 19.4–20.4 |
| Quartz | 101 | 3.342 | 26.3–27.0 |
| Plagioclase | 002 | 3.192 | 27.4–28.2 |
| Calcite | 104 | 3.035 | 29.1–29.7 |
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