Precise timing of lacustrine gypsum in Luobubo, Xinjiang using the thermal ionization mass spectrometry U-series method |
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Authors: | Zicheng Peng Weiguo Liu Pengxi Zhang Zhaofeng Zhang Jie Zhou |
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Institution: | (1) Department of Earth and Space Science, University of Science and Technology of China, 230026 Hefei, China;(2) Institute of Earth Environment, Chinese Academy of Sciences, 710054 Xi’an, China;(3) Second Branch, Institute of Salt Lakes, Chinese Academy of Sciences, 710054 Xi’an, China |
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Abstract: | Dating techniques including gypsum dissolution in water, iron hydroxide co-precipitation with uranium and thorium and mass
spectrometric determination have been investigated in this note. The ages of the gypsum samples in a CK core from Luobubo
lacustrine sediments are in the range of (12.85±0.21) kaBP (4 m distance from the top core) to (153.2±7.2) kaBP (49 m distance
from the top core) with the relative errors of ±1.6%–±4.7%. It indicates that the sedimental environment of the CK core was
situated in the middle-late Pleistocene and Holocene periods, corresponding to 1–6 stages of oxygen isotopes in the abyssal
sediments and included much information from last interglacial to Holocene warm periods. |
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Keywords: | thermal ionization mass spectrometry (TIMS) U-series dating gypsum mineral water dissolution environmental information |
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