Keywords

Carbonate (sedimentary rock)



Keyword Definition

Sedimentary rock in which at least 50 percent of the primary and/or recrystallized constituents are composed of one (or more) of the carbonate minerals calcite, aragonite, magnesite or dolomite.

Comments

Carbonate rock subcatgories are defined on two orthogonal dimensions--mineralogy (calcitic vs. dolomitic vs non-carbonate impurities), and texture. The texture categories used here are those of Dunham (1962), and involve grain size (matrix vs. grains/allochems), fabric (matrix vs. grain supported), and genesis (bound, frame, or fragmental). The textural approach used for carbonate rocks is conceptually incompatible with that used for clastic sedimentary rocks, which is solely grain size or mineralogy based. This leads to problems in the vocabulary for rocks of mixed siliclastic/carbonate mineralogy (grainstone vs. sandstone, carbonate mudstone vs. carbonate rich mudstone, how to accomodate marlstone...).

Particularly for fine-grained sedimentary rocks, distinction of 'intrabasinal' versus 'clastic' genesis can be very interpretive. In practice the use of clastic mudstone terminology as opposed to carbonate mudstone terminology may be dermined by a priori knowledge about the rock being categorized. If it is associated with other clastic rocks, the clastic categories will be favored, if with cabonate rocks, the carbonate categories will be favored.

SLTTs 2004

Parents: Carbonate sedimentary material (46); Sedimentary rock (234)

Children: Boundstone (34); Packstone (183); Pure carbonate sedimentary rock (204); Calcareous carbonate sedimentary rock (39); Carbonate mudstone (41); Carbonate wackestone (48); Crystalline carbonate (67); Dolomitic or magnesian sedimentary rock (76); Framestone (113); Grainstone (124); Impure carbonate sedimentary rock (142)

[Description taken from GeoSciML SimpleLithology201012.rdf]



Hierarchical classification

Sample >> Lithosphere >> Rock >> Whole >> Rock >> Sedimentary >> Carbonate

Children

Boundstone | Calcareous (carbonate sedimentary rock) | mudstone (Carbonate) | wackestone (Carbonate) | Crystalline | Dolomitic or magnesian (sedimentary rock) | Framestone | Grainstone | Impure (carbonate sedimentary rock) | Packstone


Category: Analysed material

The different kinds of sample material collected in the field have been classified hierarchically. Examples: “till”, “soil”, “vegetation”. Taken from the “Sample_Types_SHARED” database table.


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