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• W2030984656 abstract "We discuss a radiocarbon study of sediment samples collected from Nanfu terrace in western Taiwan. From these, we extracted humic acids (HA) and humin from the very fine and coarse grain-size fractions using a standard acid-alkali-acid pretreatment. The humin extracts were combusted at 400 and 1100 °C by stepped-combustion, to yield a low-temperature (LT) carbon component and a high-temperature (HT) carbon component. We compare the ages of the LT and HT humin fractions to the HA fractions, in samples collected at 2 depths within the Nanfu terrace. As in previous stepped-combustion studies on sediments, we find that the HA ages are the youngest on average, and overlap the LT ages, and that the carbon contained in the HT fraction is always distinctly older than the LT and HA ages. To better understand the relationship between 14 C age and combustion temperature, we conducted an incremental stepped-combustion experiment with one of the samples (1E) using 50 °C steps that ranged from 300 to 1100 °C. The 14 C results of the stepped-combustion products show a clear division between 2 isotopically identifiable carbon constituents, from carbon released below 400 °C and carbon released above 550 °C. By comparing the δ 13 C and 14 C results, we find evidence for a third carbon isotopic component in the humin that is released when combusted at ∼500 °C." @default.
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• W2030984656 date "2013-01-01" @default.
• W2030984656 modified "2023-09-23" @default.
• W2030984656 title "Low-Temperature and Temperature Stepped-Combustion of Terrace Sediments from Nanfu, Taiwan" @default.
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• W2030984656 doi "https://doi.org/10.1017/s0033822200057684" @default.
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