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- W2048444857 abstract "Abstract Geochemical variations in marine biogenic carbonates that are preserved in the geological record serve as proxies of past environmental change. However, interpreting most proxies is complicated by biologically-mediated vital effects, highlighting the need to develop new tools for reconstructing paleoenvironmental change. Recently, magnesium (Mg) isotope variability in carbonates has been explored extensively to determine its utility as a paleoenvironmental proxy. We review the results of these works, which have yielded valuable information on the factors affecting Mg isotope fractionation between carbonates and solution (Δ26Mgcarb-sol) in biogenic and abiogenic carbonate minerals. Strong evidence exists for a mineralogical control on Δ26Mgcarb-sol, with the negative offset from 0‰ following the sequence aragonite ∼3 mol/mol) and saturation states (Ω >∼3) that are similar to seawater suggest that Δ26Mgcarb-sol has a temperature dependence of ∼0.01‰ °C−1 and is insensitive to precipitation rate. In contrast, a significant precipitation rate dependence is observed in calcites precipitated from solutions with relatively low Mg/Ca ratios (" @default.
- W2048444857 created "2016-06-24" @default.
- W2048444857 creator A5011442998 @default.
- W2048444857 creator A5082665175 @default.
- W2048444857 date "2014-04-01" @default.
- W2048444857 modified "2023-10-14" @default.
- W2048444857 title "Magnesium isotope fractionation in biogenic and abiogenic carbonates: implications for paleoenvironmental proxies" @default.
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