Neomorphism

Neomorphism

Neomorphism is a recrystallization process in sedimentary rocks that changes the size (either larger or smaller) and form (it can include the overgrowth of polymorphous minerals) of crystals in the rock. The chemical composition of the rock remains the same. Neomorphism thus destroys the original crystals and builds new crystals that grow over the older ones.

In carbonate rocks neomorphism is an important step in the diagenesis of such rocks, in which the micritic matrix is exchanged for microspars (bigger, loaf-shaped crystals). The process also reduces the amount of (under surface conditions) instable aragonite and magnesium-rich calcite in the rock by replacing them with normal calcite.

The name neomorphism was minted by Folk in 1965.[1]

References

  1. ^ Folk, R.L.; 1965: Some aspects of recrystallization in ancient limestones, Society of Economic Paleontologists and Mineralogists, spec. pub. 13, p. 14-48.

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