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- W1948103397 abstract "Carbon and oxygen isotope analyses of carbonates were measured on twenty-nine sediment samples within the geochemical halo of the Lady Loretta stratiform sediment-hosted Zn-Pb-Ag deposit. Previous research indicates that the sediments in the inner halo are siderite-bearing and pass outwards to ankerite-bearing and thendolomite-bearing further from the deposit. This isotope study shows that the inner zone siderites are distinctly heavier in oxygen isotopes (δ 18 O sid = 23.2 to 28.3‰) and lighter in carbon (δ 13 C sid = –1.9 to –3.2‰) than the outer zone dolomites (δ 18 O dol = 16.5 to 18.2‰and δ 13 C dol = –0.9 to –1.5‰). Equilibrium fluid calculations suggest that the siderite halo formed at temperatures near 100°C from a fluid with δ 18 O = +6‰ and δ 13 C = –6‰, having the characteristics of an evolved basinal brine. In contrast, the outer dolomite sediments formed in equilibrium with a lower temperature (~50°C) fluid, withδ 18 O = –11‰, δ 13 C = –5‰, suggesting either a meteoric or evaporated seawater origin. The data also suggest that C/O isotopes on carbonates have the potential to be an exploration indicator of favourable stratigraphy for Zn–Pb–Ag mineralisation. For example, within a given district, carbonate sediments which show the heaviest δ 18 O values and lightest δ 13 C values may indicate proximity to mineralisation." @default.
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- W1948103397 date "1998-01-01" @default.
- W1948103397 modified "2023-09-26" @default.
- W1948103397 title "Variation of carbon and oxygen isotopes in the alteration halo to the Lady Loretta deposit - implications for exploration and ore genesis" @default.
- W1948103397 hasPublicationYear "1998" @default.
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