1. Recrystallization:
* Increased grain size: The heat would cause the calcite crystals to grow larger, potentially forming a coarser-grained rock.
* Changes in crystal habit: The pressure could alter the shape and arrangement of the calcite crystals, leading to different textures.
2. Formation of New Minerals:
* Metamorphism: The intense pressure and heat could cause the calcite to react with other minerals present in the rock. This could lead to the formation of new minerals like:
* Marble: If the calcite was pure, it could be metamorphosed into marble.
* Dolomite: If magnesium was present, the calcite could react to form dolomite (CaMg(CO3)2).
* Other calcium-rich minerals: Depending on the original composition of the rock, other calcium-rich minerals like wollastonite or garnet could form.
3. Deformation:
* Folding and faulting: The pressure could cause the rock to fold and fracture, creating distinct geological structures.
* Mineral alignment: The pressure could align the newly formed crystals, giving the rock a distinctive texture.
4. Changes in Physical Properties:
* Increased density: The recrystallization process could lead to a denser rock.
* Increased hardness: The metamorphic changes could make the rock more resistant to scratching.
* Change in color: The presence of new minerals or impurities could alter the color of the original calcite deposits.
In summary: The high temperature and pressure during the Permian Period in the Appalachian region would have transformed the calcite deposits, potentially resulting in the formation of marble, dolomite, or other calcium-rich minerals. The resulting rock would have a different texture, hardness, density, and possibly even color than the original calcite deposits.
