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- W2070548893 abstract "Lenses of sheared and metamorphosed ultramafic rocks are common within Palaeoproterozoic supracrustal rocks in the Ussuit area, central Nagssugtoqidian orogen, West Greenland. They occur in two settings: (1) along the tectonic contact between an Archaean gneiss complex and allochthonous Palaeoproterozoic arc rocks; and (2) at a structurally higher level, away from the contact with the Archaean basement. Ultramafic rocks in the first setting comprise strongly depleted peridotites, on the basis of petrographic and chemical evidence interpreted as mantle fragments, as well as hornblenditic rocks, which may represent original mafic gabbros of crustal origin. The presence of these rocks is evidence of crustal scale tectonic activity in the central part of the Nagssugtoqidian orogen. The possibility is considered that the rocks may be remnants of a disrupted ophiolite complex; strong deformation, however, prevents confirmation of this model by field evidence. Ultramafic rocks from the higher level consist mainly of amphiboles. Based on major and trace element data they are interpreted as original komatiitic lavas. Their presence suggests magmatic activity related to a mantle plume early in the history of the Nagssugtoqidian orogen." @default.
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- W2070548893 date "1999-03-01" @default.
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- W2070548893 title "Geochemistry and tectonic significance of peridotitic and metakomatiitic rocks from the Ussuit area, Nagssugtoqidian orogen, West Greenland" @default.
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- W2070548893 doi "https://doi.org/10.1016/s0301-9268(98)00109-0" @default.
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