mysqlClass Error 9 in file extras/autoload.inc.php, line 72:
Error #8192: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead
carbonate sedimentary rocks

carbonate sedimentary rocks

SRI Petrography ID: 12

Names

[de] Karbonatische Sedimentgesteine
[en] carbonate sedimentary rocks

Description

Carbonate sedimentary rocks are sedimentary rocks formed at (or near) the Earth's surface by precipitation from solution at surface temperatures or by accumulation and lithification of fragments of preexisting rocks or remains of organisms. For the formation of sedimentary rocks a longer deposition time is needed , as the sediment has to be compacted and cemented into hard beds or strata.
Characteristic for carbonate sedimentary rocks is their sedimentary facies and texture: they usually show banking as well as characteristic sedimentary structures, like bedding. Each layer of a sedimentary rock reflects the conditions during deposition: the source material (often containing organisms, like mussels, brachiopods, etc., being present in the sedimentary rock by their shells or ichnia) and the means of transport.
The most common carbonate sedimentary rocks are limestone and dolostone, but also Sodium and Potassium Carbonates are common.

Limestone is a sedimentary rock composed mainly of calcium carbonate (CaCO3), usually calcite, sometimes aragonite. As well it may contain considerable amounts of magnesium carbonate (dolomite). Most limestones have a granular texture, but limestone can also be massive, crystalline or clastic.
Most limestones are formed by the deposition and consolidation of the skeletons of marine invertebrates, but also limnic limestone exists.
Limestone can also be formed by chemical precipitation from solution.
Dolostone usually is formed by dolomitisation of limestone during diagenetical processes prior to lithification.

Color

usually white or grey, but maybe coloured due to content of iron oxides (brown, yellow, red) or carbon (blueish, grey, black).

Grain Size

usually fine grained, often massive

Texture

mostly granular, but also crystalline, clastic or massive

Minerals

calcite, aragonite, dolomite, contains often quartz, clay minerals, carbon

Occurences

various sites all over the world

Classification

Class

SEDIMENTARY ROCKS

Narrower Terms

calcareous sandstone

calcareous sinter

coral-limestone

dolostone

limestone

magnesite

marl

ooid-limestone

shell-limestone

travertine-limestone

tufa-limestone