Allochem

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A collective term introduced by Folk (1959) for one of several varieties of discrete and organized carbonate aggregates that serve as the coarser framework grains in most mechanically deposited limestones, as distinguished from sparry calcite (usually cement) and carbonate-mud matrix (micrite). Important allochems include silt-, sand-, and gravel-size fragments torn up and reworked from the deposit; ooliths; pellets; lumps; and fossils or fossil fragments (carbonate skeletons, shells, etc.). Syn: allochemical
Source: Dictionary of Mining, Mineral, and Related Terms


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