High-time resolution AMS 14C data sets for Lake Baikal and Lake Hovsgol sediment cores: Changes in radiocarbon age and sedimentation rates during the transition from the last glacial to the Holocene

Takahiro Watanabe, Toshio Nakamura, Fumiko Watanabe Nara, Takeshi Kakegawa, Kazuho Horiuchi, Ryoko Senda, Takefumi Oda, Mitsugu Nishimura, Genki Inoue Matsumoto, Takayoshi Kawai

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Abstract

High-time resolution 14C dating of Lake Baikal sediment cores indicates negative and positive anomalies of calculated linear sedimentation rate (LSR; 1.1 and 35.6 cm/ka, respectively) during the period of climate transition from the last glacial to Holocene. The timing of the Lake Baikal apparent LSR anomalies is consistent with that of the changes in the atmospheric radiocarbon concentration (Δ14C) during Younger Dryas rapid cooling event. 14C dating of lipids in the Lake Baikal surface sediments revealed that the sources of sedimentary lipids were different in each basin. In the Northern Basin of Lake Baikal, the 14C age of total lipids from the surface sediment (4.0 14C ka) was found to be older than that of TOC (1.6 14C ka). By contrast, the 14C age of total lipids in the Southern Basin was younger than that of the TOC by ca. 0.7-3.0 ka. In the Lake Hovsgol sediment cores, ages of the main lithologic boundaries during the last glacial-interglacial transition were estimated based on new 14C data sets. TOC concentration in the cores started to rapidly increase at 13.8 ± 0.3 14C ka at the base of the basinwide finely laminated layer deposited during Bølling/Allerød. The base of the layer diatomaceous mud corresponds to the end of Younger Dryas event (10.6 ± 0.1 14C ka).

Original languageEnglish
Pages (from-to)12-20
Number of pages9
JournalQuaternary International
Volume205
Issue number1-2
DOIs
Publication statusPublished - Aug 15 2009
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Earth-Surface Processes

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