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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In some cases, stylolites are generated in the middle of the allochem while in some cases they are present as small discontinuous lines reflecting chemical compaction on a very local scale.
Diagenetic studies of the Cretaceous turbidities, Sulaiman Range, Pakistan: Implications for reservoir quality
Clast type 2 has an allochem suite that is almost completely dominated by strongly aligned disarticulated and abraded thin shelled bivalves (IPosidonia) and small quantities of fine micropeloids that appear light grey in PPL.
Sedimentology of a middle Jurassic base-of-slope environment, Cutri Formation, Mallorca
These microfacies have been studied on the basis of orthochem and allochem elements, their percentages, and their texture in the stratigraphy section [19].
Microfacies study of Asmari Formation in the Northwest and Southeast of Shiraz, Iran
The term "allochem" is applied to carbonate grains greater than 0.062mm Rich, 1964.
Petrographical study of Ewekoro carbonate rocks, in Ibese, South Western Nigeria
Allochem. A particle in a carbonate rock; i.e., not mud or cement.
Getting our feet wet: ancient Alabama reefs
The two (2) microfacies and four (4) sub-microfacies with discrete texture, fossils content and allochem types are mudstone to wackestone microfacies and wackestone microfacies, sub microfacies are Larger foraminiferal mudstone to wackestone sub-microfacies, larger benthic wackestone sub-microfacies, bioclastic wackestone sub-microfacies and Nummulitic wackestone sub-microfacies.
MICROFACIES AND DIAGENETIC SETTINGS OF CHORGALI FORMATION IN TALHAR SECTION, ISLAMABAD, PAKISTAN
Additional allochem particles include pelloids, some spherical single-walled calcispheres, and rare microcrinoid ossicles.
Palaeoenvironmental significance of middle Oxfordian deep marine deposits from La Manga Formation, Neuquen Basin, Argentina
The microfacies is characterized by skeletal allochems which are the only allochemical constituents marked by moderate diversity of organisms with allochem to micrite ratio of 7:3.
Microfacies analysis and diagenetic fabric of Lockhart Limestone exposed along Nathiagali-Murree Road District Abbottabad Pakistan
The microfacies analysis represents the allochem types matrix textural features and fossils content.
Integrated paleoenvironmental bio- and sequence-stratigraphic analysis of the late Thanetian Lockhart Limestone in the Nammal Gorge section western Salt Range Pakistan
The microfacies analysis details the allochem matrix textural features and fossils content of the lithofacies (WF1-WF9).
Lithofacies paleoenvironments and sequence stratigraphic modelling of the Wargal Limestone: Implication for reservoir characterization in the Salt Range northwest Pakistan
The allochem and matrix ratio is3:7, according to visual estimation, the average relative abundance of various faunal and floralconstituents is Lockhartia (15%), Operculina(1%) and Milliolid up to (7%).
Biostratigraphy and depositional environments of the Early Eocene Margalla Hill Limestone, Kohala-Bala area, Haripur, Hazara Fold-Thrust Belt, Pakistan
On the basis of detailed petrographic analysis (i.e., allochem type, composition, texture, sedimentary structures and rock types), three microfacies and five sub microfacies are recognized (Fig.
Microfacies and diagenetic-fabric of the Samana Suk Formation at Harnoi Section, Abbottabad, Khyber Pakhtunkhwa, Pakistan

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