Notes

Chinese Science Bulletin

, Volume 46, Issue 7, pp 588-591

First online:

High-precision uranium-series dating of lacustrine carbonates from Daihai Lake

  • Qianli SunAffiliated withInstitute of Earth environment, Chinese Academy of Sciences
  • , Jie ZhouAffiliated withInstitute of Earth environment, Chinese Academy of Sciences
  • , Zicheng PengAffiliated withDepartment of Earth and Space Science, University of Science and Technology of China
  • , Weiguo LiuAffiliated withInstitute of Earth environment, Chinese Academy of Sciences
  • , Jule XiaoAffiliated withInstitute of Geology & Geophysics, Chinese Academy of Sciences

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Abstract

Ages of small aragonite samples retrieved from sediments from the Daihai Lake are determined by using the Thermal Ionization Mass Spectrometry (TIMS) technique. The ages of the samples range from (8740±601) to (10446 ±489) a, with a precision of 2%–3% for non-corrected dating ages and 4.7%-9.8% for corrected ages respectively, and are consistent within the deviation range. At about 10.5 ka BP, the grain-size of the sediments coarsens sharply, the frequency curves of grain-size distribution show coarse grain dominated single-double kurtosis, indicating cooling, decreased hydrodynamic conditions and increased wind influence procedure. This is in good agreement with previous results obtained from the Daihai Lake, which suggests that the climate was cold and the lake surface was shrinking. The TIMS ages of the sediments are therefore believed to be credible.

Keywords

Daihai Lake Thermal Ionization Mass Spectrometry aragonite