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K isotopes trace temporal silicate weathering intensity.

Long-Fei Gou1,2,3, He Sun4, Hai-Ou Gu4

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|December 8, 2025
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Summary
This summary is machine-generated.

Potassium isotopes reveal seasonal silicate weathering intensity in rivers. This finding helps track Earth

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Area of Science:

  • Geochemistry
  • Biogeochemistry
  • Earth Science

Background:

  • Silicate weathering regulates Earth's nutrient cycles and temperature.
  • Potassium (K) isotopes are potential tracers for silicate weathering, but temporal dynamics are unclear.

Purpose of the Study:

  • Investigate seasonal variations in dissolved K isotopes in the Yellow River.
  • Determine if K isotopes can effectively trace temporal changes in silicate weathering intensity.

Main Methods:

  • Analyzed seasonal variations of dissolved K isotopes in the middle Yellow River.
  • Studied a region with homogeneous loess and significant monsoon-driven climate seasonality.
  • Examined the relationship between K isotopes and aluminosilicate neoformation.

Main Results:

  • Observed strong seasonal variations in dissolved K isotopes.
  • Linked K isotope seasonality to aluminosilicate neoformation after silicate dissolution.
  • Derived an empirical relationship: δ⁴¹Krw = -0.07 × ln(W/D) - 0.38, where W/D represents silicate weathering intensity.

Conclusions:

  • K isotopes serve as effective tracers for silicate weathering intensity.
  • Seasonal K isotope variations provide insights into temporal dynamics of silicate weathering.
  • The derived empirical relationship can quantify silicate weathering intensity.