Abstract
THERE is considerable controversy1 about the origin of the coarsely crystalline calcite mosaics which have been found filling cavities in reefs and mudmound complexes of varying geological age around the world. The calcite mosaics are composed of fibrous crystals and there is doubt about whether they represent primary precipitates (cements) or are replacive and about the time and environment of their formation. Orme and Brown2 consider some fibrous calcite to be replacive, but usually the external morphology of the mosaic and its association with internal sediments suggest a cement origin3,4. Direct precipitation of fibrous calcite from freshwater, marine water, or brines trapped in the sediments (or derived from neighbouring sediments) have been suggested1. Newell5, Cotter6 and Zankl7, on the other hand, suggest that fibrous calcite filling cavities was originally aragonite.
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