The morphology of a saline groundwater body: Its investigation, description and possible explanation

Tellam, John H.; Lloyd, John William; Walters, Michael O.

doi:10.1016/0022-1694(86)90179-4

Cited by 54 publications

(15 citation statements)

References 5 publications

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“…The saline groundwaters (up to at least 100 g 1 ~1 CI ~) occur at depth throughout much of the area but rise to within 50 m of ground level along the Mersey valley (see Fig. 1) [5].…”

Section: Groundwater Chemistrymentioning

confidence: 99%

Rock/Water Interaction Timescales Involving U and Th Isotopes in a Permo-Triassic Sandstone

et al. 1992

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The aim of this work is to establish the timescales for rock/water interactions, using uranium series radionuclides measured in groundwaters and solids of the Chat Moss area of the Lower Mersey Basin Permo-Triassic sandstone aquifer. The measured characteristics of the fresh groundwaters of the area are consistent with the idea that the saline groundwaters are being flushed from the aquifer by the fresh groundwater. As mixing takes place, the CI concentrations rise, Ca 2 + and Mg 2 + are removed from the flushing water and are replaced by Na and Κ from the sandstone causing renewed calcite dissolution resulting in elevated HCOJ contents and pH. The sampled groundwaters have U concentrations in the range of 0.3 to 13.6 ppb and high 234 U/ 238 U activity ratios ranging from 1.6 to 13.8. The corresponding radium and radon contents are relatively low. The solid surfaces of the matrix material have been characterized indicating active exchange is taking place between the solid surfaces and fluids.A one-dimensional dispersion model has been used to estimate timescales for these exchange processes, and retardation factors for U and Th assuming dynamic equilibrium. Thus, for the data at a 50 m horizon a groundwater mean residence time of 250 -750 y has been estimated consistent with Darcy flow estimates and with radiocarbon data. Similar calculations applied to the data from a deeper horizon of 200 m containing a mixture of younger fresh water with much older saline groundwaters has yielded a mean residence time of ~1250y. The model yields retardation factors for uranium and thorium in this aquifer of the order of 10 3 and > 10 5 respectively. Values of precipitation rate constants for uranium and thorium indicate that this process is much more significant for thorium than for uranium in this aquifer.

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“…The saline groundwaters (up to at least 100 g 1 ~1 CI ~) occur at depth throughout much of the area but rise to within 50 m of ground level along the Mersey valley (see Fig. 1) [5].…”

Section: Groundwater Chemistrymentioning

confidence: 99%

Rock/Water Interaction Timescales Involving U and Th Isotopes in a Permo-Triassic Sandstone

et al. 1992

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“…The diagraphs for some abstraction points show that the most-mineralized water is at the base of the boreholes, which suggests differentiation by gravity of water within the aquifer. This kind of hydrochemical disposition has been highlighted in many aquifer formations whose saline wedges are the result of dissolution of evaporite deposits and mixing with brines (Tellman, 1986;Hanor & Mcintosh, 2007). Of the three aquifers logged, the greatest variation in mineralization between the surface and bottom water was in the Horna aquifer, where differences in EC of nearly 30,000 µS/cm were recorded.…”

Section: Discussionmentioning

confidence: 97%

Influence of Triassic deposits on water quality of some karstic aquifers to the south of Alicante (Spain)

et al. 2010

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“…They are considered to be the reason for old saline groundwater still being present in the aquifer east of Widnes, despite the low sea-level stands in the Devensian and other glacial intervals (Tellam et al 1986;Tellam 1995). Other examples of the barrier effects produced by faults in the Permo-Triassic sandstones of NW England have been previously recorded.…”

Section: Discussionmentioning

confidence: 99%

Structural controls on groundwater flow in the Permo-Triassic sandstones of NW England

Seymour

Ingram

Gebbett

2006

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There is increasing evidence that groundwater flow in many parts of the major Permo-Triassic sandstone aquifers of NW England is influenced strongly by predominantly N-S-trending faults. These structural controls on groundwater flow may only become apparent when the aquifers are subject to abstraction stress. A series of case examples are presented, from the Fylde Sandstone aquifer north of Preston, and from the sandstone aquifers of the Lower Mersey Basin, Manchester and Wirral areas. In these studies the 'compartmentalization' of the aquifers by faults has been recognized in field investigations and also in numerical modelling studies related to groundwater resources development on both local and aquifer-wide scales.

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The morphology of a saline groundwater body: Its investigation, description and possible explanation

Cited by 54 publications

References 5 publications

Rock/Water Interaction Timescales Involving U and Th Isotopes in a Permo-Triassic Sandstone

Rock/Water Interaction Timescales Involving U and Th Isotopes in a Permo-Triassic Sandstone

Influence of Triassic deposits on water quality of some karstic aquifers to the south of Alicante (Spain)

Structural controls on groundwater flow in the Permo-Triassic sandstones of NW England

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