Calcareous (/kælˈkɛəriəs/) is an adjective meaning "mostly or partly composed of calcium carbonate", in other words, containing lime or being chalky. The term is used in a wide variety of scientific disciplines.
Calcareous is used as an adjectival term applied to anatomical structures which are made primarily of calcium carbonate, in animals such as gastropods, i.e., snails, specifically in relation to such structures as the operculum, the clausilium, and the love dart. The term also applies to the calcium carbonate tests of, often, more-or-less microscopic Foraminifera. Not all tests are calcareous; diatoms and radiolaria have siliceous tests.
Calcareous grassland is a form of grassland characteristic of soils containing much calcium carbonate from underlying chalk or limestone rock.
In medicineedit
The term is used in pathology, for example in calcareous conjunctivitis, and when referring to calcareous metastasis or calcareous deposits, which may both be removed surgically.
Calcareous sediments are usually deposited in shallow water near land, since the carbonate is precipitated by marine organisms that need land-derived nutrients. Generally speaking, the farther from land sediments fall, the less calcareous they are. Some areas can have interbedded calcareous sediments due to storms, or changes in ocean currents.
Calcareous ooze is a form of calcium carbonate derived from planktonic organisms that accumulates on the sea floor. This can only occur if the ocean is shallower than the carbonate compensation depth (CCD). Below this depth, calcium carbonate begins to dissolve in the ocean, and only non-calcareous sediments are stable, such as siliceous ooze or pelagic red clay.
Calcareous soilsedit
Calcareous soils are relatively alkaline, in other words they have a high pH. This is because of the very weak acidity of carbonic acid. Note that this is not the only reason for a high soil pH. They are characterized by the presence of calcium carbonate in the parent material and may have a calcic horizon, a layer of secondary accumulation of carbonates (usually calcium or Mg) in excess of 15% calcium carbonate equivalent and at least 5% more carbonate than an underlying layer.[2]
^Murphy, Richard C. (2002). Coral Reefs: Cities Under The Seas. The Darwin Press, Inc. ISBN0-87850-138-X.
^"Diagnostic horizons, properties and materials". Lecture notes on the major soils of the world. FAO. Retrieved 14 June 2014.
^ abPearn, John H; Gardner-Thorpe, Christopher (11 July 2013). "11 July 2013". Geological Society, London, Special Publications. 375: 269–278. doi:10.1144/SP375.22. S2CID 140166525. Retrieved 17 July 2018.
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January 09, 2024
calcareous, ɛər, adjective, meaning, mostly, partly, composed, calcium, carbonate, other, words, containing, lime, being, chalky, term, used, wide, variety, scientific, disciplines, sandstone, seven, sisters, country, park, england, contents, zoology, botany, . Calcareous k ae l ˈ k ɛer i e s is an adjective meaning mostly or partly composed of calcium carbonate in other words containing lime or being chalky The term is used in a wide variety of scientific disciplines Calcareous sandstone in Seven Sisters Country Park England Contents 1 In zoology 2 In botany 3 In medicine 4 In geology 4 1 Marine sediments 4 2 Calcareous soils 4 3 List of calcareous rivers 5 Man made deposits 6 In electrochemistry 7 ReferencesIn zoology editCalcareous is used as an adjectival term applied to anatomical structures which are made primarily of calcium carbonate in animals such as gastropods i e snails specifically in relation to such structures as the operculum the clausilium and the love dart The term also applies to the calcium carbonate tests of often more or less microscopic Foraminifera Not all tests are calcareous diatoms and radiolaria have siliceous tests The molluscs are calcareous organisms as are the calcareous sponges Calcarea that have spicules which are made of calcium carbonate 1 In botany editMain article Calcareous grassland Calcareous grassland is a form of grassland characteristic of soils containing much calcium carbonate from underlying chalk or limestone rock In medicine editThe term is used in pathology for example in calcareous conjunctivitis and when referring to calcareous metastasis or calcareous deposits which may both be removed surgically In geology edit nbsp Calcareous mine in Perm Krai RussiaMain articles Lime material and Limestone The term calcareous can be applied to a sediment sedimentary rock or soil type which is formed from or contains a high proportion of calcium carbonate in the form of calcite or aragonite Marine sediments edit Calcareous sediments are usually deposited in shallow water near land since the carbonate is precipitated by marine organisms that need land derived nutrients Generally speaking the farther from land sediments fall the less calcareous they are Some areas can have interbedded calcareous sediments due to storms or changes in ocean currents Calcareous ooze is a form of calcium carbonate derived from planktonic organisms that accumulates on the sea floor This can only occur if the ocean is shallower than the carbonate compensation depth CCD Below this depth calcium carbonate begins to dissolve in the ocean and only non calcareous sediments are stable such as siliceous ooze or pelagic red clay Calcareous soils edit Calcareous soils are relatively alkaline in other words they have a high pH This is because of the very weak acidity of carbonic acid Note that this is not the only reason for a high soil pH They are characterized by the presence of calcium carbonate in the parent material and may have a calcic horizon a layer of secondary accumulation of carbonates usually calcium or Mg in excess of 15 calcium carbonate equivalent and at least 5 more carbonate than an underlying layer 2 List of calcareous rivers edit GangaMan made deposits editCalcareous deposits can form in water pipes 3 An example of this is Sunday stone 3 In electrochemistry editCalcareous coatings or calcareous deposits are mixtures of calcium carbonate and magnesium hydroxide that are deposited on cathodically protected surfaces because of the increased pH adjacent to the surface References edit Murphy Richard C 2002 Coral Reefs Cities Under The Seas The Darwin Press Inc ISBN 0 87850 138 X Diagnostic horizons properties and materials Lecture notes on the major soils of the world FAO Retrieved 14 June 2014 a b Pearn John H Gardner Thorpe Christopher 11 July 2013 11 July 2013 Geological Society London Special Publications 375 269 278 doi 10 1144 SP375 22 S2CID 140166525 Retrieved 17 July 2018 nbsp Wikimedia Commons has media related to Calcareous nbsp Look up calcareous in Wiktionary the free dictionary Retrieved from https en wikipedia org w index php title Calcareous amp oldid 1141984560, wikipedia, wiki, book, books, library,
