Loesses as a result of evolution of the water-rock system under weak water exchange
Analysis of the natural abundance ofloesses 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 runoffis ＜0.3 l/s.km2). Thermodynamic calculation of the sodic-water-rock equilibrium evidences that the waters 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 the water-rock system. This stage is to be called sodic or sodic-loess.
S.L.Shvartsev
Tomsk Department of Trofimuk Institute of Petrolium Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
153-156
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）