Volume 43 Issue 11
Nov.  2018
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Hu Quanxu, Wang Xianyan, Meng Xianqiang, Liu Quanyu, Lu Huayu, 2018. Paleoclimatic Implications of Oxygen Isotope from Authigenic Carbonates in Loess Deposit of Northeastern Tibetan Plateau. Earth Science, 43(11): 4128-4137. doi: 10.3799/dqkx.2018.228
Citation: Hu Quanxu, Wang Xianyan, Meng Xianqiang, Liu Quanyu, Lu Huayu, 2018. Paleoclimatic Implications of Oxygen Isotope from Authigenic Carbonates in Loess Deposit of Northeastern Tibetan Plateau. Earth Science, 43(11): 4128-4137. doi: 10.3799/dqkx.2018.228
shu

Paleoclimatic Implications of Oxygen Isotope from Authigenic Carbonates in Loess Deposit of Northeastern Tibetan Plateau

doi: 10.3799/dqkx.2018.228
  • 1.

    School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China

  • 2.

    School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China

  • 3.

    School of Tourism & Environment, Ankang University, Ankang 725000, China

  • Received Date: 2018-06-28
  • Publish Date: 2018-11-15
    Abstract
  • The carbonate in loess deposit records the pedogenic environment, especially the moisture information, and can be used to qualitatively and/or quantitatively reconstruct paleoclimate. The δ18O values of the pedogenic carbonate in loess of LGM and Early Holocene, from Ledu (northeastern Tibetan plateau), Northeast China and Bayanbulak basin in Xingjiang, were measured. It showns that the δ18O values of the pedogenic carbonate in loess of LGM and Early Holocene from northeastern Tibetan plateau are -1.38 ‰ and -5.58 ‰, which are 5.74‰ and 1.54‰ respectively higher than the theoretical values of δ18O under the condition of modern monsoon climate. However, the temperature difference was not enough to cause this significant magnitude change of the δ18O values in the pedogenic carbonate. Compared with that in East Asian monsoon region including the Chinese Loess plateau and the Northeast China, the values of the δ18O of the pedogenic carbonate in loess from Ledu during LGM and the Early Holocene are ~2.0‰-6.2‰ higher obviously, but similar to those in the westerly regions such as Xinjiang. The distribution characteristics and spatial differences of the δ18O values of the pedogenic carbonate in loess in different periods may reflect that the East Asian summer monsoon was not the controlling factor of the precipitation during the LGM and early Holocene in the northeastern Tibetan plateau (NETP), while the westerly rainfall and/or local vapor evaporation cycle had an important impact in this period. The climate changing from dry and cold to warm and humid, with higher temperature but less evaporation, could be the reason for the gradual decrease of the δ18O values of the pedogenic carbonate in the loess from LGM to Early Holocene in NETP. The δ18O values of the pedogenic carbonate in the loess from different climatic zones (NETP, the East Asian monsoon region and the westerly zone), revealed by limited data in this study, are significantly different, with which climatic indication is worth further investigation.

     

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