Jump to navigationJump to search

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

Sponsor: Get your real estate license with Real Estate Express' online pre-licensing courses that work with your busy schedule. Save 30% with code START30 at checkout!