Dolomite formation in the seawater–freshwater interface

Magaritz, Mordeckai; Goldenberg, Lior C.; Kafri, Uri; Arad, Arnon

doi:10.1038/287622a0

Cited by 78 publications

(18 citation statements)

References 13 publications

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“…Observations on the chemical reaction occurring in the interface [Nadler et al, 1980] indicate that the main reaction in the carbonate system is calcium-magnesium exchange related to dolomitization (see also Magaritz et al [1980]). This dolomitization process does not have a significant effect on the clay mineral behavior.…”

Section: Some Implications Of the Observed Processmentioning

confidence: 99%

Experimental investigation on irreversible changes of hydraulic conductivity on the seawater‐freshwater interface in coastal aquifers

Goldenberg¹,

Magaritz²,

Mandel³

1983

Water Resources Research

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Seawater and fresh groundwater were made to flow through columns filled with samples from a ‘good aquifer’ that contained 5% or less clay minerals. Hydraulic conductivities decreased very sharply whenever seawater was flushed by fresh groundwater. The extent of the decrease depended mainly on the percentage of clays and reached maximum values of 10−1 to 10−3 of the original hydraulic conductivity. Subsequent flushing with seawater restored hydraulic conductivity only in a slight measure, if at all. The mechanism of this process was investigated by using CaCl2 and NaCl solutions with the ionic strengths of seawater and fresh groundwater. It appears that the decrease of hydraulic conductivity is caused by an incipient stage of gel formation. The small water‐clay configurations that are formed during this stage behave as practically rigid particles and close the bottlenecks between adjacent pores. The major implications of these findings for groundwater hydrology are as follows: (1) In natural coastal aquifers the seawater‐freshwater interface is likely to undergo shifts on a semigeologic time scale. If the aquifer contains even a small percentage of clays, these shifts may create an almost impermeable boundary in the zone of the interface. Hitherto existing theories on movements of the interface regard permeability as constant. (2) The attempt to repel a fresh water‐seawater interface by the injection of fresh water may create a practically impermeable boundary within a relatively short time, and thus defeat its own purpose.

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Section: Some Implications Of the Observed Processmentioning

confidence: 99%

Experimental investigation on irreversible changes of hydraulic conductivity on the seawater‐freshwater interface in coastal aquifers

Goldenberg¹,

Magaritz²,

Mandel³

1983

Water Resources Research

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“…A large number of studies report that the porosity of an aquifer changes in zones of contact between different types of water, resulting in alterations of the texture of the sediment by cementation, leaching and recrystallization (Schmorak 8s Mercado, 1968;Runnells, 1969;Magaritz et al, 1980, Shukla & Friedman, 1983. Such diagenetic changes influence hydrogeological processes over a long time-span.…”

Section: Introductionmentioning

confidence: 99%

Water-rock interaction at the mixing zone between chemically different bodies of groundwater—implications for management of sandy aquifers

Goldenberg¹,

Mandel²,

Magaritz³

1986

Hydrological Sciences Journal

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Hydrogeological parameters of an aquifer change by diagenetic processes due to water-rock interaction. The clay fraction which exists in the matrix of sedimentary aquifers even in minute quantity has great importance in these processes. The resulting change may influence the flow regime. One of the zones most affected by diagenesis is where two chemically different types of water meet. Numerous coastal aquifers, including the one in Israel, contain chemically different types of water, and, consequently, many interfaces. The degree of alteration of hydrogeological parameters was studied in the laboratory under the extreme conditions of a seawater/fresh-water interface; where a large decrease of hydraulic conductivity was observed. One can use the findings of this laboratory study in building a model of prediction for the influence of water-rock interaction on the flow in other interfaces of an aquifer.

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“…While evaporative escape undoubtedly occurs, much of the groundwater loss by this process to the atmosphere at Al-Khiran is replaced by a dilute lateral flow from the continental areas (Robinson and Gunatilaka, 1991). While the mixed water dolomitization model is demonstrable for rocks as young as Pleistocene (Margaritz et al, 1980), there are only two documented cases of modern mixing zone dolomite formation (Gunatilaka, 1991;Chafetz and Rush, 1994).…”

Section: Discussionmentioning

confidence: 97%

Stable isotope (chlorine, hydrogen and oxygen), geochemical and field evidence for continental fluid flow vectors in the Al-Khiran sabkha (Kuwait)

Duane

Al-Zamel

Eastoe

2004

Journal of African Earth Sciences

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Dolomite formation in the seawater–freshwater interface

Cited by 78 publications

References 13 publications

Experimental investigation on irreversible changes of hydraulic conductivity on the seawater‐freshwater interface in coastal aquifers

Experimental investigation on irreversible changes of hydraulic conductivity on the seawater‐freshwater interface in coastal aquifers

Water-rock interaction at the mixing zone between chemically different bodies of groundwater—implications for management of sandy aquifers

Stable isotope (chlorine, hydrogen and oxygen), geochemical and field evidence for continental fluid flow vectors in the Al-Khiran sabkha (Kuwait)

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