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• W1981363686 abstract "δD-values of unmetamorphosed, chlorite plus muscovite-bearing pelitic rocks of the Virginia Formation in northeastern Minnesota range from −68 to −54‰, with H 2 O contents between 3.66 and 4.41 wt%. Contact metamorphism by mafic magmas of the Duluth Complex has led to devolatilization and loss of ∼2.5–3.5 wt% H 2 O accompanied by a decrease in whole-rock δD-values. Minerals produced during metamorphism include cordierite, biotite and, locally, orthopyroxene. Footwall hornfels at the Dunka Road Cu/1bNi deposit are characterized by δD-values between −91 and −59‰, with H 2 O contents between 2.52 and 1.10 wt%. Xenoliths and footwall rocks at the Babbitt Cu/1bNi deposit show a wide range in δD (−131 to −69‰) and H 2 O (0.50–2.63) values. Isotopic modelling of chlorite-, muscovite- and biotite-consuming reactions suggest that Rayleigh fractionation during devolatilization may account for the trend of decreasing δD and H 2 O content. The computations indicate that the δD and H 2 O data are consistent with the liberation of a fluid during contact metamorphism that contained up to 15% methane. Results are in excellent agreement with fluid compositions estimated from mineral equilibria and carbon isotopic data. The average isotopic composition of the evolved fluid is −53‰. δ D-values < −110‰ that are recorded in some xenoliths and footwall rocks at Babbitt may be a result of retrograde hydration and isotopic exchange with a D-depleted fluid of magmatic origin, or may reflect variations in parent rock δD-value or chlorite/muscovite ratio." @default.
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• W1981363686 date "1992-12-01" @default.
• W1981363686 modified "2023-09-27" @default.
• W1981363686 title "Effects of devolatilization on the hydrogen isotopic composition of pelitic rocks in the contact aureole of the Duluth Complex, northeastern Minnesota, U.S.A." @default.
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• W1981363686 doi "https://doi.org/10.1016/0009-2541(92)90155-x" @default.
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