Paleoclimate analysis using tufa deposits ―a case study in Niangziguan, Shanxi Province, China

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  • KANO Akihiro
    Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University
  • LIU Zaihua
    Institute of Karst Geology, Chinese Academy of Geology Sciences
  • TAKASHIMA Chiduru
    Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University
  • KAWAI Tatsuya
    Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University
  • HORI Masako
    Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University

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Other Title
  • トゥファを用いた古気候解析 ―中国山西省娘子関の例
  • トゥファ オ モチイタ コ キコウ カイセキ チュウゴク サンセイショウ ジョウシ カン ノ レイ

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Abstract

Paleoclimatic analysis was made on the basis of occurrence feature and stable isotopic compositions of freshwater carbonate tufas in Niangziguan, Shanxi Province, north China. Published dating study suggests that the tufas were most extensively deposited in a period of 55-35ka, which corresponds to oxygen isotopic stage 3. The tufas deposited in this period exhibit mm-order lamination. Results of high-resolution analysis of oxygen isotope indicate that it is annual lamination consisting of summer coarse-crystalline and winter fine-crystalline layers. Stable isotopic analysis reveals that the laminated paleotufa is lower in both of δ18O and δ13C values than the modern tufa. The difference in the δ 18O values indicates higher temperatures by two to three degrees for the deposition of the paleotufa, if is assumed that the isotopic compositions of water have been constant for several tens ky. The lower values in δ 13C can be ascribed to active production of CO2 in the soil layer, or to a relatively closed condition in the underground water system. The tufa may have deposited more actively during the oxygen isotopic stage 3 than today. Spring water issued in a significant amount, which formed deep flow covering bunches of fallen wood. The active deposition of paleotufa indicates a wetter climate. Assumption of this study agrees with the paleoclimatic analyses of loess-paleosol sequences in north China.

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