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- W1488572032 abstract "[1] Oxygen isotope values of diatom silica (δ18Odiatom) are increasingly used as paleoclimate proxies; however, the magnitude and timing of post-mortem alteration of δ18Odiatom values has been unclear. In freshwater diatom silica from a human-made pond in northern New Mexico, post-mortem alteration of δ18Odiatom values occurs within one year of sediment burial. Diatom silica collected antemortem has an average δ18Odiatom value of 21.5‰ (VSMOW, σ = 1.3, n = 23), whereas diatom silica from two sediment cores from the same freshwater environment records significantly higher δ18Odiatom values (28.9‰, σ = 0.8, n = 13). The difference in ante- and post-mortem δ18Odiatom values indicate post-mortem alteration of diatom silica oxygen that results in a >7‰ increase in δ18O values. This study demonstrates that δ18Odiatom values reach mature values within 0.5 years of frustule death. Initial diatom δ18O values that record growing conditions are rapidly overwritten during silica maturation, and the mature diatom δ18O values approach isotopic equilibrium for quartz-water. The rapid post-mortem alteration of diatom δ18O values explains much of the disparate data regarding silica-water fractionation for diatom silica and has a profound effect on the use of diatom silica δ18O values as a paleoclimate proxy in lacustrine and marine environments." @default.
- W1488572032 created "2016-06-24" @default.
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- W1488572032 date "2012-09-01" @default.
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- W1488572032 title "Rapid post-mortem maturation of diatom silica oxygen isotope values" @default.
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- W1488572032 doi "https://doi.org/10.1029/2011gc004019" @default.
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