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Une plateforme carbonatée est une structur … Une plateforme carbonatée est une structure géologique formée par la sédimentation en eau peu profonde de calcaire d'origine organique (bioconstruction), que l'organisme vivant soit sessile (cas des coraux, des cnidaires, etc.) ou non (plancton). Ces structures ont des dimensions de l'ordre du kilomètre ; les plus grandes atteignent plusieurs milliers de kilomètres de longueur, plusieurs centaines de milliers de kilomètres carrés et plusieurs kilomètres d'épaisseur. Ces plateformes carbonatées peuvent se développer dans presque n'importe quel contexte tectonique, mais elles sont particulièrement répandues le long des marges passives. Les plus grandes plateformes carbonatées actuelles sont représentées par les bancs des Bahamas, les récifs autour de la péninsule du Yucatán ou ceux au sud de la Floride, la Grande barrière de corail, les lagons de Nouvelle-Calédonie ou encore les Maldives. Les plateformes carbonatées sont typiques des eaux tropicales où elles regroupent un grand nombre de récifs, atolls et lagons mais elles se rencontrent aussi dans des eaux plus tempérées où elles sont notamment édifiées par des algues rouges. Des plateformes carbonatées fossiles formées au Paléozoïque et Mésozoïque ne font pas intervenir directement des mécanismes de biominéralisation mais se forment dans des eaux riches en nutriments et pauvres en oxygène.iches en nutriments et pauvres en oxygène.
, A carbonate platform is a sedimentary body … A carbonate platform is a sedimentary body which possesses topographic relief, and is composed of autochthonic calcareous deposits. Platform growth is mediated by sessile organisms whose skeletons build up the reef or by organisms (usually microbes) which induce carbonate precipitation through their metabolism. Therefore, carbonate platforms can not grow up everywhere: they are not present in places where limiting factors to the life of reef-building organisms exist. Such limiting factors are, among others: light, water temperature, transparency and pH-Value. For example, carbonate sedimentation along the Atlantic South American coasts takes place everywhere but at the mouth of the Amazon River, because of the intense turbidity of the water there. Spectacular examples of present-day carbonate platforms are the Bahama Banks under which the platform is roughly 8 km thick, the Yucatan Peninsula which is up to 2 km thick, the Florida platform, the platform on which the Great Barrier Reef is growing, and the Maldive atolls. All these carbonate platforms and their associated reefs are confined to tropical latitudes. Today's reefs are built mainly by scleractinian corals, but in the distant past other organisms, like archaeocyatha (during the Cambrian) or extinct cnidaria (tabulata and rugosa) were important reef builders. and rugosa) were important reef builders.
, Con il termine piattaforma carbonatica si … Con il termine piattaforma carbonatica si intende, in sedimentologia e in biologia, un'area situata in ambiente marino o lacustre, caratterizzata da un rilievo topografico più o meno accentuato e da un'elevata produzione di materiale carbonatico autoctono di origine prevalentemente biogenica, derivato dall'accumulo di parti dure di organismi a scheletro calcareo oppure dalla precipitazione di carbonato indotta dall'attività di organismi viventi.ndotta dall'attività di organismi viventi.
, Uma plataforma carbonatada é, em sedimento … Uma plataforma carbonatada é, em sedimentologia e biologia, uma área situada em ambiente marinho ou lacustre, caracterizada por relevo topográfico mais ou menos acentuado e uma elevada produção de materiais carbonatados autóctones, ou seja, de origem local, não transportados de outros locais por ação de agentes erosivos como ondas e correntes, de origem principalmente biogénica. O crescimento da plataforma é regulado por organismos sésseis cujos esqueletos formam o recife, ou por organismos, normalmente micróbios, que induzem a precipitação carbonatada através do seu metabolismo. Alguns exemplos de plataformas carbonatadas são os Bahama Banks, sob os quais a plataforma atinge 8 km de espessura, a península do Iucatão com 2 km de espessura, a plataforma da Flórida, a plataforma sobre a qual se ergue a Grande Barreira de Coral, e os atóis das Maldivas. Todas se situam em latitudes tropicais. Os recifes atuais são maioritariamente compostos por corais escleractinianos, mas em eras antigas podiam ser compostos por archaeocyatha (durante o Câmbrico) ou cnidaria extintos ( e rugosa).âmbrico) ou cnidaria extintos ( e rugosa).
, Eine Karbonatplattform ist ein im Meer sed … Eine Karbonatplattform ist ein im Meer sedimentär abgelagerter Gesteinskörper, der seine Umgebung überragt und aus vor Ort abgelagerten Kalkablagerungen besteht. Das Wachstum der Plattform wird von sessilen Organismen verursacht, deren Skelette ein Riff aufbauen, oder durch die Ausfällung von Kalk aus Meerwasser, die vor allem durch den Stoffwechsel von Mikroben verursacht wird. Spektakuläre Beispiele heutiger Karbonatplattformen sind die Bahama Banks (mehrere Kilometer mächtig), die Halbinsel Yucatán, das Great Barrier Reef und die Atolle der Malediven. Auch die Halbinsel Florida ist eine Karbonatplattform, allerdings ist sie nicht mehr von Wasser bedeckt. Alle diese Riffe sind auf tropische Breiten beschränkt. Heutige Riffe werden vor allem von Steinkorallen aufgebaut, in der geologischen Vergangenheit waren auch andere Organismen am Aufbau von Karbonatplattformen beteiligt, so etwa Tabulata und Rugosa, andere Nesseltiere oder Archaeocyathiden. andere Nesseltiere oder Archaeocyathiden.
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A carbonate platform is a sedimentary body … A carbonate platform is a sedimentary body which possesses topographic relief, and is composed of autochthonic calcareous deposits. Platform growth is mediated by sessile organisms whose skeletons build up the reef or by organisms (usually microbes) which induce carbonate precipitation through their metabolism. Therefore, carbonate platforms can not grow up everywhere: they are not present in places where limiting factors to the life of reef-building organisms exist. Such limiting factors are, among others: light, water temperature, transparency and pH-Value. For example, carbonate sedimentation along the Atlantic South American coasts takes place everywhere but at the mouth of the Amazon River, because of the intense turbidity of the water there. Spectacular examples of present-day carbonSpectacular examples of present-day carbon
, Eine Karbonatplattform ist ein im Meer sed … Eine Karbonatplattform ist ein im Meer sedimentär abgelagerter Gesteinskörper, der seine Umgebung überragt und aus vor Ort abgelagerten Kalkablagerungen besteht. Das Wachstum der Plattform wird von sessilen Organismen verursacht, deren Skelette ein Riff aufbauen, oder durch die Ausfällung von Kalk aus Meerwasser, die vor allem durch den Stoffwechsel von Mikroben verursacht wird.Stoffwechsel von Mikroben verursacht wird.
, Uma plataforma carbonatada é, em sedimento … Uma plataforma carbonatada é, em sedimentologia e biologia, uma área situada em ambiente marinho ou lacustre, caracterizada por relevo topográfico mais ou menos acentuado e uma elevada produção de materiais carbonatados autóctones, ou seja, de origem local, não transportados de outros locais por ação de agentes erosivos como ondas e correntes, de origem principalmente biogénica.entes, de origem principalmente biogénica.
, Con il termine piattaforma carbonatica si … Con il termine piattaforma carbonatica si intende, in sedimentologia e in biologia, un'area situata in ambiente marino o lacustre, caratterizzata da un rilievo topografico più o meno accentuato e da un'elevata produzione di materiale carbonatico autoctono di origine prevalentemente biogenica, derivato dall'accumulo di parti dure di organismi a scheletro calcareo oppure dalla precipitazione di carbonato indotta dall'attività di organismi viventi.ndotta dall'attività di organismi viventi.
, Une plateforme carbonatée est une structur … Une plateforme carbonatée est une structure géologique formée par la sédimentation en eau peu profonde de calcaire d'origine organique (bioconstruction), que l'organisme vivant soit sessile (cas des coraux, des cnidaires, etc.) ou non (plancton). Ces structures ont des dimensions de l'ordre du kilomètre ; les plus grandes atteignent plusieurs milliers de kilomètres de longueur, plusieurs centaines de milliers de kilomètres carrés et plusieurs kilomètres d'épaisseur.arrés et plusieurs kilomètres d'épaisseur.
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, Karbonatplattform
, Carbonate platform
, Piattaforma carbonatica
, Plataforma carbonatada
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