allochem

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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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pseudoallochem

References in periodicals archive ?

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.

Microfacies study of Asmari Formation in the Northwest and Southeast of Shiraz, Iran

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.

Petrographical study of Ewekoro carbonate rocks, in Ibese, South Western Nigeria

Ooids account for 78 percent of allochems in mud-free samples of the lithofacies and 66 percent of allochems in the lithofacies overall.