EGU2020-686
https://doi.org/10.5194/egusphere-egu2020-686
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Hydroclimatic fluctuation in Lake Yakhi, eastern Mongolia

Alexander Orkhonselenge1, Odmaa Bulgan1,2, Dashtseren Gerelsaikhan1, Tuyagerel Davaagatan3, and Nyamdorj Altansukh1
Alexander Orkhonselenge et al.
  • 1Laboratory of Geochemistry & Geomorphology, School of Arts & Sciences, National University of Mongolia, Ulaanbaatar 14201, Mongolia, rkhnslng@num.edu.mn
  • 2Dornod Branch of Administrative Office for the Protected Areas, Kherlen sum 9, Dornod 21060, Mongolia, odbulgann@gmail.com
  • 3Divistion of Physical Geography, Institute of Geography & Geoecology, Mongolian Academy of Sciences, Ulaanbaatar 210620, Mongolia, dtuyagerel@gmail.com

This study aims to reconstruct paleoclimate change in eastern Mongolia inferred from sedimentological and geochronological records from Lake Yakhi in the drainage basin of the Pacific Ocean. In a context of the study goal the hydroclimatic fluctuation in eastern Mongolia resulted from Lake Yakhi is presented here. Result from changes in lake area of Lake Yakhi shows it decreased from 79.72 km2 in 1970 to 53.76 km2 in 1986 and 35.03 km2 in 2018. The hydraulic dynamics and field observation show that Lake Yakhi is shifting into a playa lake. For shrinking Lake Yakhi, shifting toward a playa lake is directly related to the global warming, i.e., it implies the lake is extremely sensitive to climate change in the late Holocene. This coincides with those conditions of large lakes in the Govi region in southern Mongolia (Orkhonselenge et al., 2018). The major element compositions of the lake sediments show that the core Y18-1 is dominated by SiO2, Al2O3, K2O and Na2O, while the cores Y18-2 and Y18-3 largely contain SiO2, Al2O3, CaO and Fe2O3. In addition to the dominant semimetal and transition metal, presence of oxides of alkali earth metals in the core Y18-1 and of alkaline earth metals in the cores Y18-2 and Y18-3 show a derivation of intermediate sedimentary and volcanic rocks in the drainage basin of Lake Yakhi. This coincides with the tectonostratigraphic terrane structure of the cratonal clastic sedimentary rocks (Badarch et al., 2002) in the Lake Yakhi area. Further detail geomorphological and geochronological records from Lake Yakhi would not review only the hydrogeochemical evolution, but the paleoclimate changes in eastern Mongolia. Leading the dates would precisely determine the paleohydroclimatic fluctuations in eastern Mongolia.

How to cite: Orkhonselenge, A., Bulgan, O., Gerelsaikhan, D., Davaagatan, T., and Altansukh, N.: Hydroclimatic fluctuation in Lake Yakhi, eastern Mongolia, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-686, https://doi.org/10.5194/egusphere-egu2020-686, 2019

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  • CC1: Comment on EGU2020-686, Michael Wagreich, 02 May 2020

    Dear Orkhon,

    it may interesting if you have also some trace metal data like Pb and Cu from your core material. That may give (1) indications for anthropogenic influence in this remote setting in the youngest part, and (2) may also help in dating this youngest part.

    Did you do some C14 dating?

    Michael Wagreich

    • AC1: Reply to CC1, Alexander Orkhonselenge, 03 May 2020

      Dear Prof. Michael, 

      Thank you very much for your comments and question.

      In further analyses, we will keep trace elements and dating.

      At present time, we haven't completed 14C dating. That's in our plan.