Loesses as a result of evolution of the water-rock system under weak water exchange

S. L. Shvartsev

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Analysis of the natural abundance of loesses showed that they occur in the same zones as sodic waters, namely, forest-steppe, steppe and mountain-steppe landscapes with a weak water exchange (subsurface runoff is <0.3 l/s.km 2).Thermodynamic calculation of the sodic-water-rock equilibrium evidences that thewaters are always in equilibrium with montmorillonite, hydromica, kaolinite, and calcite but are in nonequilibrium with endogenous aluminosilicates. Therefore, in alkaline media sodic waters permanently (though slowly) dissolve terrigenous sediments and form clays and calcite, i.e., a complex of secondary deposits called loesses. The conclusion has been drawn that loesses and sodic waters are paragenetic products of the same geologic process running at the particular stage of evolution of thewater-rock system. This stage is to be called sodic or sodic-loess.

Original languageEnglish
Title of host publicationWater-Rock Interaction - Proceedings of the 12th International Symposium on Water-Rock Interaction, WRI-12
Pages153-156
Number of pages4
Volume1
Publication statusPublished - 1 Dec 2007
Event12th International Symposium on Water-Rock Interaction, WRI-12 - Kunming, China
Duration: 31 Jul 20074 Aug 2007

Other

Other12th International Symposium on Water-Rock Interaction, WRI-12
CountryChina
CityKunming
Period31.7.074.8.07

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Water Science and Technology

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