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单词 greenstone belt
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Examples ofgreenstone belt

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After the intrusions solidified, new stresses on thegreenstonebeltcaused movement horizontally along several faults and moved huge blocks of the crust vertically relative to adjacent blocks.
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Some of the greenstone belts are more than 3 billion years old.
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These greenstone belts consist of felsic volcanics, felsic batholiths, felsic plutons and sediments aged from 2,700 to 2,670 million years old.
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It also incorporates greenstone belts comprising mafic, ultramafic and felsic volcanics which are associated with epiclastic sediments and iron formations.
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They are characterized by greenstone belts, tonalites, and other high-grade metamorphic lithologies.
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Greenstone belts containing mineralogy are related to volcanic activity.
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Archaean greenstone belts are hypothesized to have been formed from passive margin oceanic crust that became part of an extensive subduction-undercut margin.
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Metavolcanic rock is commonly found in greenstone belts.
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This block is a high-grade gneiss terrane; it has no greenstone belts.
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Through time, the degree of sediment contained within greenstone belts has risen, and the amount of ultramafic rock (either as layered intrusions or as volcanic komatiite) has decreased.
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Rhenium-osmium isotope studies indicates that the gold in those mineral deposits came from unusual three billion year old mantle sourced intrusions known as komatiites present in the greenstone belts.
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Rhenium-osmium isotope studies indicate that the gold in those mineral deposits came from unusual 3000 million year old mantle-derived intrusions known as komatiite, present in the greenstone belts.
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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
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更新时间：2024/12/27 23:37:17