Midcontinent Rift System (original) (raw)
Le rift médio-continental (Midcontinent Rift System, MRS), rift nord-américain, ou rift de Keweenaw est un rift de 2 000 km de long, situé au centre du continent nord-américain et au milieu du bord sud de la plaque nord-américaine. Il s'est formé lorsque le cœur du continent, le craton nord-américain, a commencé à se désagréger durant le Mésoprotérozoïque, il y a 1,1 milliard d'années. La formation du rift fut avortée (il s'agit d'un aulacogène), laissant des couches épaisses de roches magmatiques exposées au nord, mais recouvertes par des formations sédimentaires ultérieures sur la plus grande partie des bras est et ouest, lesquels se rejoignent au lac Supérieur, qui est entièrement contenu dans la (en). La (en), située en Ontario et dans le Minnesota, définit l'arc nord du rift. Partan
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| dbo:abstract | The Midcontinent Rift System (MRS) or Keweenawan Rift is a 2,000 km (1,200 mi) long geological rift in the center of the North American continent and south-central part of the North American plate. It formed when the continent's core, the North American craton, began to split apart during the Mesoproterozoic era of the Precambrian, about 1.1 billion years ago. The rift failed, leaving behind thick layers of igneous rock that are exposed in its northern reaches, but buried beneath later sedimentary formations along most of its western and eastern arms. Those arms meet at Lake Superior, which is contained within the rift valley. The lake's north shore in Ontario and Minnesota defines the northern arc of the rift. From the lake, the rift's eastern arm trends south to central lower Michigan, and possibly into Indiana, Ohio, Kentucky, Tennessee, and Alabama. The western arm runs from Lake Superior southwest through portions of Wisconsin, Minnesota, Iowa, and Nebraska to northeastern Kansas, and possibly into Oklahoma. (en) Le rift médio-continental (Midcontinent Rift System, MRS), rift nord-américain, ou rift de Keweenaw est un rift de 2 000 km de long, situé au centre du continent nord-américain et au milieu du bord sud de la plaque nord-américaine. Il s'est formé lorsque le cœur du continent, le craton nord-américain, a commencé à se désagréger durant le Mésoprotérozoïque, il y a 1,1 milliard d'années. La formation du rift fut avortée (il s'agit d'un aulacogène), laissant des couches épaisses de roches magmatiques exposées au nord, mais recouvertes par des formations sédimentaires ultérieures sur la plus grande partie des bras est et ouest, lesquels se rejoignent au lac Supérieur, qui est entièrement contenu dans la (en). La (en), située en Ontario et dans le Minnesota, définit l'arc nord du rift. Partant du lac, le bras est du rift tourne vers le sud du Michigan, et s'étend peut-être jusqu'à travers l'Indiana, l'Ohio, le Kentucky, le Tennessee et l'Alabama. Le bras ouest traverse une partie du Wisconsin, du Minnesota, de l'Iowa, et du Nebraska pour atteindre le nord-est du Kansas, et peut-être même l'Oklahoma. (fr) Il sistema di rift mediocontinentale (in lingua inglese Midcontinent Rift System (MRS) o Keweenawan Rift) è un rift (cioè una regione in cui la crosta terrestre e la litosfera si trovano in condizioni tettoniche distensive e tendono a separarsi) lungo 2.000 km situato al centro del continente nord americano e nella porzione centro-meridionale della placca nordamericana. Si formò quando il nucleo del continente, cioè il cratone nordamericano o Laurentia, cominciò a fratturarsi e dividersi circa 1,1 miliardi di anni fa durante il Mesoproterozoico nell'era del Precambriano. Il rift abortì producendo un aulacogeno e lasciando dietro spessi strati di rocce magmatiche che sono ora esposte nelle propaggini settentrionali, mentre lungo gran parte dei bracci occidentali e orientali esse sono ancora sepolte sotto formazioni sedimentarie successive. Questi bracci si incontrano nel Lago Superiore, che è situato all'interno della fossa tettonica. La sponda settentrionale del Lago Superiore nell'Ontario e nel Minnesota definisce l'arco settentrionale del rift. Dal lago, il braccio orientale del rift si dirige verso sud fino alla parte centrale del basso Michigan e probabilmente fino all'Indiana, Ohio, Kentucky, Tennessee e Alabama. Il braccio occidentale si dirige dal Lago Superiore verso sudovest attraverso parte del Wisconsin, Minnesota, Iowa e Nebraska fino alla parte nordorientale del Kansas, e probabilmente fino all'Oklahoma. (it) Американська Середньоконтинентальна рифтова система або Рифт Ківіно є 2000 км завдовжки геологічний рифт в центральній частині Північноамериканського континенту і південно-центральній частині Північноамериканської плити. Вона утворилася, коли континентальна зона північноамериканського кратону, зазнала розділ, за часів мезопротерозою, близько 1,1 млрд років тому. Але рифт не мав розвитку, і був похован пізніше товстим шаром породи уздовж більшої частини західного і східного авлакогену. Ці авлакогени мають з'єднання під озером Верхнє, яке розташовано в рифтовій долині. озера в провінції Онтаріо та штаті Міннесота є північним авлакогеном рифтової системи. Від трійника на схід авлакоген прямує півднем центру Мічигана. Західний авлакоген прямує від озера Верхнє на південний захід через штату Вісконсин, Міннесота, Айова та Небраска до північного сходу Канзасу.. (uk) |
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| dbo:wikiPageExternalLink | https://wim.usgs.gov/geonarrative/MRS_mineral_deposits/ https://eos.org/features/new-insights-into-north-americas-midcontinent-rift https://doi.org/10.1029/2016EO056659. |
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| rdfs:comment | Le rift médio-continental (Midcontinent Rift System, MRS), rift nord-américain, ou rift de Keweenaw est un rift de 2 000 km de long, situé au centre du continent nord-américain et au milieu du bord sud de la plaque nord-américaine. Il s'est formé lorsque le cœur du continent, le craton nord-américain, a commencé à se désagréger durant le Mésoprotérozoïque, il y a 1,1 milliard d'années. La formation du rift fut avortée (il s'agit d'un aulacogène), laissant des couches épaisses de roches magmatiques exposées au nord, mais recouvertes par des formations sédimentaires ultérieures sur la plus grande partie des bras est et ouest, lesquels se rejoignent au lac Supérieur, qui est entièrement contenu dans la (en). La (en), située en Ontario et dans le Minnesota, définit l'arc nord du rift. Partan (fr) The Midcontinent Rift System (MRS) or Keweenawan Rift is a 2,000 km (1,200 mi) long geological rift in the center of the North American continent and south-central part of the North American plate. It formed when the continent's core, the North American craton, began to split apart during the Mesoproterozoic era of the Precambrian, about 1.1 billion years ago. The rift failed, leaving behind thick layers of igneous rock that are exposed in its northern reaches, but buried beneath later sedimentary formations along most of its western and eastern arms. Those arms meet at Lake Superior, which is contained within the rift valley. The lake's north shore in Ontario and Minnesota defines the northern arc of the rift. From the lake, the rift's eastern arm trends south to central lower Michigan, a (en) Il sistema di rift mediocontinentale (in lingua inglese Midcontinent Rift System (MRS) o Keweenawan Rift) è un rift (cioè una regione in cui la crosta terrestre e la litosfera si trovano in condizioni tettoniche distensive e tendono a separarsi) lungo 2.000 km situato al centro del continente nord americano e nella porzione centro-meridionale della placca nordamericana. (it) Американська Середньоконтинентальна рифтова система або Рифт Ківіно є 2000 км завдовжки геологічний рифт в центральній частині Північноамериканського континенту і південно-центральній частині Північноамериканської плити. Вона утворилася, коли континентальна зона північноамериканського кратону, зазнала розділ, за часів мезопротерозою, близько 1,1 млрд років тому. Але рифт не мав розвитку, і був похован пізніше товстим шаром породи уздовж більшої частини західного і східного авлакогену. (uk) |
| rdfs:label | Sistema di rift mediocontinentale (it) Rift médio-continental (fr) Midcontinent Rift System (en) Американська Середньоконтинентальна рифтова система (uk) |
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