allochem

allochem

[′a·lō‚kem]
(geology)
Sediment formed by chemical or biochemical precipitation within a depositional basin; includes intraclasts, oolites, fossils, and pellets.
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These microfacies have been studied on the basis of orthochem and allochem elements, their percentages, and their texture in the stratigraphy section [19].
5: Distribution charts of Orthochem and Allochems in Sarvestan and Sandra Sections Sarvestan section Sadra Section Grainstone 45% 67% Packstone 0% 1% Wackstone 9% 12% Mudstone 46% 20% Bioclast 75% 77% Pellet 16% 14% Interaclast 8% 8% Extraclast 1% 1% Note: Table made from pie chart.
In classifying limestone, various attempts have been made, notable among them are the classification scheme of Folk (1959,1962) which was based on three components: allochems, matrix and cements.
Ooids account for 78 percent of allochems in mud-free samples of the lithofacies and 66 percent of allochems in the lithofacies overall.