Evaporite dissolution

Gutierrez F, Orti F, Gutierrez M, Perez-Gonzalez A, Benito G, Gracia FJ, Duran JJ (2002) Paleosubsidence and active subsidence due to evaporite dissolution in Spain. Carbonates Evaporites 17 121-133... 

Keywords Carbonate dissolution, Dissolved flux, Dissolved load, Ebro River basin, Evaporite dissolution, Long-term fluxes... 

In the dissolved load, the preferential dissolution of the different types of lithology or mineral can cause large variations in trace-element abundances in rivers. A classical tracer of rock dissolution is strontium. The isotopic ratio of strontium in river waters is, to a first approximation, explained by mixing between different sources. Rain, evaporite dissolution, and carbonate and silicate weathering are the predominant sources of strontium in rivers (see Chapter 5.12). Examples of the use of Ca/Sr, Na/Sr, and Sr isotopic ratios to quantify the proportion of strontium derived from carbonate weathering in large basins can be found in Negrel et al. (1993)... 

McManus K. M. and Hanor J. S. (1993) Diagenetic evidence for massive evaporite dissolution, fluid flow, and mass transfer in the Louisiana Gulf Coast. Geology 21,121-I m. 

Vengosh and Spivack, 2000), S S uifate (Krouse and Mayer, 2000), CPC1 (Phillips et al., 1986 Phillips, 2000 see Chapter 5.15), and S Owater (sce Chapter 5.11) variations can be used to discriminate between multiple salinity sources. The variations of some of these tracers are presented in Figures 13 and 14. A clear distinction is shown between marine sources such as seawater intrusion or marine-derived brines (e.g.. Dead Sea), nonmarine (e.g., evaporite dissolution), and anthropogenic (e.g., sewage effluents, agricultural return flows) sources. 

Figure 13 Elucidation of saline sources by using the variations of Br/Cl and B/Cl ratios. Note the expected geochemical distinction between seawater, evaporated seawater, brines (e.g.. Dead Sea), hydrothermal fluids, sewage effluents, agricultural drainage (e.g., Salton Sea), and evaporite dissolution.

Figure 17 Elucidation of saline sources by using the variations of C1/C1 and i l/i I. Note the isotopic distinction between modem meteoric water and agricultural return relative to formation water, evaporite dissolution, and seawater. Arrows represent possible extended ranges (sources Ekwurzel et al., 2001 ...

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