Stylolite

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stylolite

[′stī·lə‚līt]
(geology)
An irregular surface, generally parallel to a bedding plane, in which small toothlike projections on one side of the surface fit into cavities of complementary shape on the other surface; interpreted to result diagenetically by pressure solution.

Stylolite

 

a type of feature encountered in sedimentary rocks wherein spinous or columnar projections on the surface of one layer fit into cavities of complementary shape on a second layer. In cross section, the stylolite surface suggests gear teeth in mesh. The columns can reach 1 m in length, and their sides are covered with striations parallel to the longitudinal axis. A clayey substance forms along the plane of the seam. Stylolites are often converted to sutures—zigzag seams with conical teeth. Stylolites occur in limestones and, more rarely, dolomites, coal, argillites, quartzites, gypsum, and other sedimentary formations.

REFERENCES

Kholodov, V. N. “K voprosu o proiskhozhdenii suturo-stilolitovykh shvov.” Izv. AN SSSR: Ser. geologicheskaia, 1955, no. 2.
Bushinskii, G. I. “O stilolitakh.” Izv. AN SSSR: Ser. geologicheskaia, 1961, no. 8.

stylolite

A jointed or irregular columnar structure occasionally found in beds of limestone, uniting the adjoining surfaces of two layers of rock.
References in periodicals archive ?
The uneven bedding planes are covered with discontinuous, wavy or stylolitic, greenish marly partings.
The upper part of a complete cycle is represented by thin-bedded to laminated, fine-crystalline dolostone with wavy to stylolitic greenish marly partings.
Simon shows irregular laminations defined by alternation between well compacted sutured quartz laminae with stylolitic texture and porous laminae of rounded hematite coated quartz grains with overgrowths.
The following three microfacies were identified; a-Algal laminated burrowed sandy dolosparite (MAF- 1), b-sandy dolomitized peloidal packstone (MAF-2) and c-fractured stylolitic sandy dolosparite (MAF-3).
In the Margala Hill Limestone a number of stylolitic features have been recognized within subtidal distal shelf and middle shelf facies.
These are low amplitude stylolite to stylolitic swarms and/or irregular stylolite solution seams are isolated or swarm-like partings characterized by thin seams often with accumulations of insoluble residues (Logan and Semeniuk 1976).
The limestone is grey, yellowish grey and yellowish brown in color, fine- grained, medium to thick-bedded, nodular, rippled and stylolitic at places.
These changes represent the final phase (phyllomorphic) of diagenesis, deep burial, increased geothermal gradient and pressure as is also evident from quartz overgrowths, stylolitic boundaries of some of the grains and healing of intra-granular fractures in quartz and feldspar with ore minerals.
These rocks are of significant commercial importance and comprise a series of porous, clean, pellet and fossiliferous limestones with interbedded tight (often stylolitic lime) mudstones and packstones.