Last glacial-Holocene geochronology of sediment cores from a high-altitude Tibetan lake based on AMS 14C dating of plant fossils: Implications for paleoenvironmental reconstructions

Takahiro Watanabe, Tetsuya Matsunaka, Toshio Nakamura, Mitsugu Nishimura, Yasuhiro Izutsu, Motoyasu Minami, Fumiko Watanabe Nara, Takeshi Kakegawa, Junbo Wang, Liping Zhu

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We obtained three sediment cores from a high-altitude lake (Lake Pumoyum Co; altitude, ~5020m asl) on the southern Tibetan plateau for reconstruction of environmental changes during the last glacial-Holocene transition. In this study, we established the first reliable chronology for sediment cores from Lake Pumoyum Co, ca. 18.5cal ka BP at the bottom, by 14C analyses of terrestrial plant residue concentrates (PRC, >125μm) and aquatic plant residues. The calibrated ages of the PRC fraction in the surface sediment were nearly modern (0.1±0.1cal ka BP), and the δ13C values (-22‰ to -24‰) were agreed well with those of modern terrestrial C3 plants. In addition, we estimated 14C reservoir ages of macrophyte remains from changes in their δ13C values. The major climate boundary layers in the cores (transitions to Bølling-Allerød, 14.5±0.5cal ka BP; Younger Dryas, 12.8±0.1cal ka BP; and Preboreal, ~11.6cal ka BP) were confirmed by our new 14C chronology. The transition to the Bølling-Allerød warm phase from the last glacial (14.5±0.5cal ka BP) coincided with an obvious lithologic boundary (a rapid decrease in the abundance of the macrophyte remains) in the Lake Pumoyum Co sediment cores.

Original languageEnglish
Pages (from-to)21-29
Number of pages9
JournalChemical Geology
Volume277
Issue number1-2
DOIs
Publication statusPublished - 2010 Oct 1

Keywords

  • Lake Pumoyum Co
  • Old carbon effect
  • Radiocarbon dating
  • Reservoir effect
  • Tibetan plateau
  • δC

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

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