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- W2890150810 abstract "Abstract Lamprophyres represent hydrous alkaline mantle melts that are a unique source of information about the composition of continental lithosphere. Throughout southwest Britain, post-Variscan lamprophyres are (ultra)potassic with strong incompatible element enrichments. Here we show that they form two distinct groups in terms of their Sr and Nd isotopic compositions, occurring on either side of a postulated, hitherto unrecognized terrane boundary. Lamprophyres emplaced north of the boundary fall on the mantle array with ε Nd −1 to +1.6. Those south of the boundary are enriched in radiogenic Sr, have initial ε Nd values of −0.3 to −3.5, and are isotopically indistinguishable from similar-aged lamprophyres in Armorican massifs in Europe. We conclude that an Armorican terrane was juxtaposed against Avalonia well before the closure of the Variscan oceans and the formation of Pangea. The giant Cornubian Tin-Tungsten Ore Province and associated batholith can be accounted for by the fertility of Armorican lower crust and mantle lithosphere." @default.
- W2890150810 created "2018-09-27" @default.
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- W2890150810 date "2018-09-14" @default.
- W2890150810 modified "2023-10-12" @default.
- W2890150810 title "Mapping a hidden terrane boundary in the mantle lithosphere with lamprophyres" @default.
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- W2890150810 doi "https://doi.org/10.1038/s41467-018-06253-7" @default.
- W2890150810 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6138702" @default.
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