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- W3021704213 abstract "Abstract The 144–133Ma Koegel Fontein Igneous Complex is notable for the high proportion of magmatic rocks with very low δ18O values ( 10‰) δ18O values on a cm scale in the shear zone are consistent with peak temperature and accompanying deformation post-dating, at least in part, fluid infiltration. The low permeability and lack of brittle overprinting of the shear zone are inconsistent with fluid flow post-dating deformation. Modelling of the inferred oxygen isotope exchange demonstrates that fluid-rock interaction must have occurred at either high temperatures (for infiltrating water with a δ18O value of −10‰, W/R is ~1 at 700 °C) or with very low δ18O values for the infiltrating fluids. If the infiltrating fluid had δ18O values 250 °C for exchange to occur in a reasonable time-period, even if the δ18O values were abnormally low. Previous studies have suggested fluid infiltration into mid-crustal fault systems and shear zones may play an important role in the rheological evolution of these structures. This study provides direct evidence for such infiltration and suggests that the identification of similar settings may help to establish the frequency and significance of these processes." @default.
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- W3021704213 date "2020-08-01" @default.
- W3021704213 modified "2023-09-24" @default.
- W3021704213 title "Deep infiltration of surface water during deformation? Evidence from a low- δ18O shear zone at Koegel Fontein, Namaqualand, South Africa" @default.
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- W3021704213 doi "https://doi.org/10.1016/j.lithos.2020.105562" @default.
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