Lewisian complex (original) (raw)

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Das Lewisian ist eine Abfolge hochgradig metamorpher Gneise im Grundgebirge des Hebriden-Terrans.

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dbo:abstract Das Lewisian ist eine Abfolge hochgradig metamorpher Gneise im Grundgebirge des Hebriden-Terrans. (de) The Lewisian complex or Lewisian gneiss is a suite of Precambrian metamorphic rocks that outcrop in the northwestern part of Scotland, forming part of the Hebridean Terrane and the North Atlantic Craton. These rocks are of Archaean and Paleoproterozoic age, ranging from 3.0–1.7 billion years (Ga). They form the basement on which the Torridonian and Moine Supergroup sediments were deposited. The Lewisian consists mainly of granitic gneisses with a minor amount of supracrustal rocks. Rocks of the Lewisian complex were caught up in the Caledonian orogeny, appearing in the hanging walls of many of the thrust faults formed during the late stages of this tectonic event. (en) Lo sciame di dicchi Scourie, è uno sciame di dicchi intrusi nella sequenza di rocce metamorfiche del Precambriano che affiorano nella parte nordoccidentale della Scozia e fanno parte del . Queste rocce risalgono all'Archeano e al Paleoproterozoico, con un'età compresa tra 3,0 e 1,7 miliardi di anni. Lo sciame è di tipologia semplice e taglia le formazioni a bande degli gneiss del complesso Scourie e postdata gli importanti eventi ignei, tettonici e metamorfici che lo hanno creato. A causa del successivo metamorfismo e delle deformazioni in altre parti degli affioramenti, le uniche date affidabili di datazione radiometrica provengono dalla regione centrale, indicando un'età di 2,4 miliardi di anni per la componente principale dello sciame. Alcuni dicchi, che risultano intrusi nella più fredda crosta dello Scourie, hanno un'età di 2,0 miliardi di anni, la stessa età di alcuni sill non datati del Loch Maree Group. Alcuni dicchi della sequenza principale mostrano evidenza di intrusione nel basamento originario più caldo della regione. La maggior parte dei dicchi sono costituiti di quarzo-dolerite, con minore presenza di gabbro di olivina, norite e picrite di bronzite. (it)
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rdfs:comment Das Lewisian ist eine Abfolge hochgradig metamorpher Gneise im Grundgebirge des Hebriden-Terrans. (de) The Lewisian complex or Lewisian gneiss is a suite of Precambrian metamorphic rocks that outcrop in the northwestern part of Scotland, forming part of the Hebridean Terrane and the North Atlantic Craton. These rocks are of Archaean and Paleoproterozoic age, ranging from 3.0–1.7 billion years (Ga). They form the basement on which the Torridonian and Moine Supergroup sediments were deposited. The Lewisian consists mainly of granitic gneisses with a minor amount of supracrustal rocks. Rocks of the Lewisian complex were caught up in the Caledonian orogeny, appearing in the hanging walls of many of the thrust faults formed during the late stages of this tectonic event. (en) Lo sciame di dicchi Scourie, è uno sciame di dicchi intrusi nella sequenza di rocce metamorfiche del Precambriano che affiorano nella parte nordoccidentale della Scozia e fanno parte del . Queste rocce risalgono all'Archeano e al Paleoproterozoico, con un'età compresa tra 3,0 e 1,7 miliardi di anni. Lo sciame è di tipologia semplice e taglia le formazioni a bande degli gneiss del complesso Scourie e postdata gli importanti eventi ignei, tettonici e metamorfici che lo hanno creato. (it)
rdfs:label Lewisian (de) Sciame di dicchi Scourie (it) Lewisian complex (en)
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