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Hydrogeology of Mongolian Soda Lakes

Hydrogeology of Mongolian Soda Lakes. Ben Linhoff. Lakes. Wells. Observation and Questions. Strontium isotopes vary substantially between sampling locations. What is the cause of the variation? What are the implications of the variation?. Strontium isotope basics.

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Hydrogeology of Mongolian Soda Lakes

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  1. Hydrogeology of Mongolian Soda Lakes Ben Linhoff

  2. Lakes

  3. Wells

  4. Observation and Questions • Strontium isotopes vary substantially between sampling locations. • What is the cause of the variation? • What are the implications of the variation?

  5. Strontium isotope basics • 87/86Sr in water typically varies as a function of water/rock interactions. • 87/86Sr obtain the signature of the rock controlling water chemistry. • 87/86Sr can vary substantially in rain water (I have no rain water samples…).

  6. Flow accumulation layer Defines number of cells which flow into each downstream cell. 8

  7. Slope Layer Maximum change between cell and its 8 neighbors

  8. Wetness Index = ln ( FA / tan (slope) )

  9. Wells Expected Loess

  10. Lakes

  11. Soda Lakes HCO3 pH

  12. Lakes weathering

  13. Lakes 87/86Sr Variation • 87/86Sr controlled by water rock interactions • 87/86Sr in lakes a function of weathering and average 87/86Sr groundwater input

  14. Implications • Wetness Index is a great tool to predict extent of groundwater/rock interactions. • Wetness Index and flow accumulation layers are a function of the catchment area of a closed basin lake.

  15. Conclusions • Chemistry of well and lake water is controlled by loess • Wetness Index predicts 87/86Sr variation at my field site

  16. Questions?

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