To use all functions of this page, please activate cookies in your browser.
my.chemeurope.com
With an accout for my.chemeurope.com you can always see everything at a glance – and you can configure your own website and individual newsletter.
- My watch list
- My saved searches
- My saved topics
- My newsletter
Folk classificationThe Folk classification, devised by R. L. Folk in 1959, is a technical descriptive classification of calcareous sedimentary rocks. It details the relative proportions of allochems in the rock and the type of matrix. The classification scheme covers most common carbonate rocks, however the more inclusive although less precise alternative, Dunham classification, may be preferred in some instances. Additional recommended knowledge
Applying Folk ClassificationFolk classification consists of one or two prefixes followed by a suffix. SuffixesThe suffix -sparite is used if the rock has a crystalline matrix, and -micrite if it contains a micritic, or mud-based, matrix. PrefixesThe prefix describing the main (non-matrix) component of the rock immediately precedes the suffix, a second prefix describing a second important component may be tagged on to the front of this. Common Prefixesoo-Used to denote the presence of ooids bio-Used to describe biogenetic remnants - for example, shells, echinoiderm ossicles or other tests pel-Describes the presence of peloids (fossilised droppings). May also be used to describe any pellet under 2 mm in diameter (as peloids are often hard to distinguish from intraclasts after diagenesis) intra-Denotes the presence of intraclasts, for example quartz grains or carbonate clasts eroded from the surrounding rocks. ExampleA rock consisting mainly of ooids with some shelly fragments, with a crystalline matrix, would be termed a biooosparite. References
|
|
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Folk_classification". A list of authors is available in Wikipedia. |