Study of the Effects of Heating on Organic Matter and Mineral Phases in Limestones

Figure 3

XRD patterns for the powders after the dissolution of calcium carbonate of the three types of limestones (a) biomicrite (BC-PAD), (b) biosparite (BS-PAD), and (c) intramicrite (IM-PAD) for thermal treatments of 25°C, 300°C, and 600°C. Reflection peaks are labeled as quartz (Q), goethite (G), hematite (H), tosudite (T), and kaolinite (K).

(a)

(b)

(c)