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- W2036412289 abstract "Zircons in Tertiary granitic rocks from the Isle of Skye, Scotland were resistant to measurable oxygen isotope exchange during intense hydrothermal activity in the subvolcanic environment. Five granite bodies from the Western Red Hills complex were investigated; four have 18O(Zrc) = 4.1 ± 0.2%o (VSMOW) while the fifth, which intruded before major cauldron subsidence, is 2‰ lower. Zircons from Lewisian gneiss are visually and isotopically distinct indicating that zircons in the granite are not xenocrysts from the Lewisian basement. Analysis of different magnetic and size fractions of zircon shows no significant correlation to δ18O supporting the conclusion that these values represent the true magmatic compositions and that the Western Red Hills granites intruded as low δ18O magmas with a whole rock δ18O ≤ 6.0‰. Quartz separates from four granites are close to the calculated magmatic values in δ18O, but in the fifth, values are 5‰ lower indicating variable exchange of quartz with low δ18O heated meteoric waters. These results might be explained by magmatic interaction with hydrothermally altered crust early in the evolution of the granites, before crystallization of zircon, followed by interaction with later hydrothermal fluids. Alternatively, independent evidence for low δ18O mafic magmatism in NW Scotland suggests the presence of large quantities of low δ18O subducted ocean crust in the subcontinental lithosphere that could contaminate or be the source of low δ18O mantle-derived melts." @default.
- W2036412289 created "2016-06-24" @default.
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- W2036412289 date "1997-12-01" @default.
- W2036412289 modified "2023-10-14" @default.
- W2036412289 title "Low δ18O magma, Isle of Skye, Scotland: Evidence from zircons" @default.
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- W2036412289 doi "https://doi.org/10.1016/s0016-7037(97)00297-4" @default.
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