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• W3136558094 endingPage "120179" @default.
• W3136558094 startingPage "120179" @default.
• W3136558094 abstract "Oligocene deep syn-rift lakes in the Gulf of Tonkin, Vietnam, represent exceptional paleoenvironmental archives, but their use for unravelling the regional paleoclimatic development has been hindered by poor dating. Here we present a high-resolution carbon isotope record of wood particles (δ 13 C wood ) and bulk organic matter (δ 13 C org ) from a 500 m thick cored Oligocene sedimentary succession representing a deep syn-rift lake. The obtained data allows for estimation of the age of the succession and gives a rare insight into the in-lake fractionation processes. Correlation of the carbon isotopic signature of δ 13 C wood with the global marine record narrows the duration of the deposition of the succession to 1.2 Ma (25.7–26.9 Ma), thus significantly improving any previous age estimates for the core. The comparison of the δ 13 C wood with δ 13 C org pinpoints parts of the δ 13 C org signal influenced by in-lake fractionation processes and indicates two dominant factors controlling them. The lake productivity induced fractionation is seen as more positive δ 13 C values than expected from wood δ 13 C. This prevailed during more oxygenated periods, while organic matter degradation related processes dominated the fractionation during the more anoxic periods. The oxygenation of the lake was mostly dependent on changes in tectonic setting that resulted in some variations in lake depth and was strengthened by climatic influence." @default.
• W3136558094 created "2021-03-29" @default.
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• W3136558094 date "2021-06-01" @default.
• W3136558094 modified "2023-10-14" @default.
• W3136558094 title "Carbon isotope stratigraphy in an Oligocene deep syn-rift lake, Gulf of Tonkin, Vietnam: Implications for in-lake isotope fractionation and correlation to the global δ13C trend" @default.
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