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Qu'est-ce (qui) est dolomitic sediments - définition
CARBONATE MINERAL - CAMG(CO₃)₂
Pearl spar; Calcium magnesium carbonate; Dolomitic; Dolomitic lime
![Cristallo]] in the [[Dolomites]] mountain range near [[Cortina d'Ampezzo]], Italy. The Dolomite Mountains were named after the mineral.](https://commons.wikimedia.org/wiki/Special:FilePath/Faloria Cortina d'Ampezzo 12.jpg?width=200 "Cristallo]] in the [[Dolomites]] mountain range near [[Cortina d'Ampezzo]], Italy. The Dolomite Mountains were named after the mineral.")
![microscope]], but [[thin section]]s can be etched and stained in order to identify the minerals. [[Photomicrograph]] of a thin section in cross and plane polarised light: the brighter mineral grains in the picture are dolomite, and the darker grains are calcite.](https://commons.wikimedia.org/wiki/Special:FilePath/Thin section microscopy Siilinjärvi 501M3 etched.jpg?width=200 "microscope]], but [[thin section]]s can be etched and stained in order to identify the minerals. [[Photomicrograph]] of a thin section in cross and plane polarised light: the brighter mineral grains in the picture are dolomite, and the darker grains are calcite.")
Cyclic sediments
![Top of a metric regressive cycle with [[desiccation]]s, surface of bed dolomitised. Middle liassic of the High Atlas, Morocco.](https://commons.wikimedia.org/wiki/Special:FilePath/Desiccation Rnim.jpg?width=200 "Top of a metric regressive cycle with [[desiccation]]s, surface of bed dolomitised. Middle liassic of the High Atlas, Morocco.")
SEQUENCES OF SEDIMENTARY ROCKS THAT ARE CHARACTERISED BY REPETITIVE PATTERNS OF DIFFERENT ROCK TYPES (STRATA) OR FACIES WITHIN THE SEQUENCE
Cyclic sedimentation; Cyclic sediment; Rhythmic sediment; Rhythmic sediments; Depositional cycle
Cyclic sediments (also called rhythmic sediments) are sequences of sedimentary rocks that are characterised by repetitive patterns of different rock types (strata) or facies within the sequence. Processes that generate sedimentary cyclicity can be either autocyclic or allocyclic, and can result in piles of sedimentary cycles hundreds or even thousands of metres thick.
Dolomite (rock)
![Triassic dolomitic rocks from [[Slovakia]]](https://commons.wikimedia.org/wiki/Special:FilePath/7092 pieskovna Dolinka pri Hradisti pod Vratnom dolomit.JPG?width=200 "Triassic dolomitic rocks from [[Slovakia]]")
![Erosion of dolomite over weaker shale created the [[Niagara Escarpment]]](https://commons.wikimedia.org/wiki/Special:FilePath/Canadian Horseshoe Falls with city of Niagara Falls, Ontario in background.jpg?width=200 "Erosion of dolomite over weaker shale created the [[Niagara Escarpment]]")
![Erosion of dolomitic rocks in [[Mourèze]], Hérault, France](https://commons.wikimedia.org/wiki/Special:FilePath/Cirque de Mourèze, Hérault 32.jpg?width=200 "Erosion of dolomitic rocks in [[Mourèze]], Hérault, France")
![Cutting dolomite in 1994. [[Saaremaa]], [[Estonia]].](https://commons.wikimedia.org/wiki/Special:FilePath/Saaremaa dolomiit 1994 (04).jpg?width=200 "Cutting dolomite in 1994. [[Saaremaa]], [[Estonia]].")
![[[Trilobite]] fossil preserved as an internal cast in [[Silurian]] dolomite from southwestern Ohio, USA](https://commons.wikimedia.org/wiki/Special:FilePath/Sthenarocalymene celebra - Arthropoda, Trilobita, Polymerida, Calymenidae - Silurian - Ohio, USA.jpg?width=200 "[[Trilobite]] fossil preserved as an internal cast in [[Silurian]] dolomite from southwestern Ohio, USA")
SEDIMENTARY CARBONATE ROCK
Dolomite rock; Magnesium limestone; Microdolomite; Microdolomites; Dolomitic limestone; Dolomite (rocks); Dolomitic rock; Dolostone; Metadolomite
Dolomite (also known as dolomite rock, dolostone or dolomitic rock) is a sedimentary carbonate rock that contains a high percentage of the mineral dolomite, CaMg(CO3)2. It occurs widely, often in association with limestone and evaporites, though it is less abundant than limestone and rare in Cenozoic rock beds (beds less than about 66 million years in age).
dolostone
SEDIMENTARY CARBONATE ROCK
Dolomite rock; Magnesium limestone; Microdolomite; Microdolomites; Dolomitic limestone; Dolomite (rocks); Dolomitic rock; Dolostone; Metadolomite
['d?l?st??n]
¦ noun Geology rock consisting of dolomite.
Wikipédia
Dolomite (mineral)
Dolomite () is an anhydrous carbonate mineral composed of calcium magnesium carbonate, ideally CaMg(CO3)2. The term is also used for a sedimentary carbonate rock composed mostly of the mineral dolomite. An alternative name sometimes used for the dolomitic rock type is dolostone.
