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- W2103951198 abstract "Dykes of the East Greenland Tertiary dyke swarm can be divided into pre- and syn-break-up tholeiitic dykes, and postbreak-up transitional dykes. Of the pre- and syn-break-up dykes, the most abundant group (Tholeiitic Series; TS) has major element compositions similar to the main part of the East Greenland flood basalts. A group of high-MgO tholeiitic dykes (Picrite---Ankaramite Series; PAS) are much less common, and are equivalent to some of the oldest lavas of the East Greenland flood basalts. Isotopic compositions of the TS and PAS dykes partly overlap with those for Iceland, but Pb isotopic compositions extend to less radiogenic values than those seen in either Iceland or North Atlantic mid-ocean ridge basalt (MORB). The isotopically depleted source required to account for this isotopic variation is interpreted as subcontinental lithospheric mantle with low 87 Sr/ 86 Sr and 206 Pb/ 204 Pb and high eNd. The post-break-up Transitional Series (TRANS) dykes are isotopically distinct from Iceland and MORB, and are interpreted as the products of contamination of Iceland plume melts with continental crust. Comparison of the Nd---Sr---Pb isotopic and trace element compositions of dykes from different segments of the East Greenland margin indicates that there is no systematic compositional change with distance from the presumed protoIcelandic plume centre. This suggests that a northwardincreasing crustal thickness observed offshore may be attributed to active upwelling rather than a systematic rise in temperature towards the plume centre." @default.
- W2103951198 created "2016-06-24" @default.
- W2103951198 creator A5022932339 @default.
- W2103951198 date "2003-11-01" @default.
- W2103951198 modified "2023-10-17" @default.
- W2103951198 title "An Isotope and Trace Element Study of the East Greenland Tertiary Dyke Swarm: Constraints on Temporal and Spatial Evolution during Continental Rifting" @default.
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- W2103951198 doi "https://doi.org/10.1093/petrology/egg071" @default.
- W2103951198 hasPublicationYear "2003" @default.
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