TY - JOUR
T1 - High-time resolution AMS 14C data sets for Lake Baikal and Lake Hovsgol sediment cores
T2 - Changes in radiocarbon age and sedimentation rates during the transition from the last glacial to the Holocene
AU - Watanabe, Takahiro
AU - Nakamura, Toshio
AU - Nara, Fumiko Watanabe
AU - Kakegawa, Takeshi
AU - Horiuchi, Kazuho
AU - Senda, Ryoko
AU - Oda, Takefumi
AU - Nishimura, Mitsugu
AU - Matsumoto, Genki Inoue
AU - Kawai, Takayoshi
N1 - Funding Information:
The authors wish to express their gratitude to the staff of the Center for Chronological Research, Nagoya University. We thank the members of the BDP and HDP Projects for the collection of sediment core samples from Lakes Baikal and Hovsgol. We also wish to thank the staff of the School of Marine Science and Technology, Tokai University, for the preservation and the division of sediment cores. This research was partly supported by Grant-in-Aid for Young Scientists (B) to Takahiro Watanabe (No. 19700676) from MEXT, by Grants-in-Aids for Scientific Research (B) to Toshio Nakamura (No. 16320108), and by Grants-in-Aids for Scientific Research (B) to Genki I. Matsumoto (No. 16310012) from JSPS, Japan. We acknowledge Dr. A. Prokopenko and two anonymous reviewers for their valuable comments and suggestions which have helped improve the manuscript.
PY - 2009/8/15
Y1 - 2009/8/15
N2 - 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).
AB - 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).
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U2 - 10.1016/j.quaint.2009.02.002
DO - 10.1016/j.quaint.2009.02.002
M3 - Article
AN - SCOPUS:68049139693
SN - 1040-6182
VL - 205
SP - 12
EP - 20
JO - Quaternary International
JF - Quaternary International
IS - 1-2
ER -
