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Table T2. 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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