Chapter 3: Annealing Recrystallization in Calcite Crystals and Aggregates

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Abstract
Annealing recrystallization has been produced in cold-strained single crystals of calcite, fine-grained undeformed aggregates, highly sheared aggregates, and in Yule marble deformed cold under controlled conditions. The critical temperature for recrystallization of Yule marble is about 500°C. In our limited experience annealing time does not seem to influence recrystallization. In contrast to recrystallization during shear strain (syntectonic recrystallization), which develops high preferred orientation, annealing recrystallization tends to produce a random orientation, but traces of a preferred orientation inherited from the original material remain. Textures of calcite fabrics completely recrystallized by annealing closely resemble granoblastic or porphyroblastic textures ofmetamorphic rocks. Recrystallization of calcite is similar in every respect that we have yet explored to recrystallization of metals. Water and CO2 have not affected the process in our experiments.

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