Regional aquifer hydrogeochemistry in the confined aquifer system below the Boom Clay (NE Belgium): data analysis and modelling

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Regional aquifer hydrogeochemistry in the confined aquifer system below the Boom Clay (NE Belgium): data analysis and modelling. / Vandersteen, Katrijn; Leterme, Bertrand; Gedeon, Matej.

In: Geological Society, London, Special Publications, Vol. 443, 22.06.2016.

Research output: Contribution to journalSpecial issuepeer-review

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@article{e90d0a3dcfd349f19ed265e64d41a5fd,
title = "Regional aquifer hydrogeochemistry in the confined aquifer system below the Boom Clay (NE Belgium): data analysis and modelling",
abstract = "Geochemical data from the deep aquifer system below the Boom Clay in NE-Belgium have been collected and reinterpreted. The data were obtained between 1980 and 2014 within the framework of radioactive waste disposal studies. Currently, groundwater in the deep aquifer system mainly ranges between NaHCO3 type and NaCl type. Because of the low groundwater velocity in this aquifer system, re-equilibration with the mineralogical composition of the host formations generally occurs. The main geochemical indicators point out that the current formation waters are a mixture between the original saline marine porewaters and freshwater recharge. SE-NW gradients of increasing ion concentrations are observed and can be explained in agreement with the pattern of natural groundwater flow. Calcite dissolution and cation exchange are still ongoing in this freshening aquifer system. A low sulphate content in the deep aquifer system indicates sulphate reduction associated with organic matter degradation. Inverse modelling along a flow path using PHREEQC generally confirms the reactions that have been derived in the data analysis.",
keywords = "confined aquifers, hydrogeochemistry, PHREEQC",
author = "Katrijn Vandersteen and Bertrand Leterme and Matej Gedeon",
note = "Score=10",
year = "2016",
month = jun,
day = "22",
doi = "10.1144/SP443.7",
language = "English",
volume = "443",
journal = "Geological Society, London, Special Publications",
issn = "0305-8719",
publisher = "Geological Society of London",

}

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TY - JOUR

T1 - Regional aquifer hydrogeochemistry in the confined aquifer system below the Boom Clay (NE Belgium): data analysis and modelling

AU - Vandersteen, Katrijn

AU - Leterme, Bertrand

AU - Gedeon, Matej

N1 - Score=10

PY - 2016/6/22

Y1 - 2016/6/22

N2 - Geochemical data from the deep aquifer system below the Boom Clay in NE-Belgium have been collected and reinterpreted. The data were obtained between 1980 and 2014 within the framework of radioactive waste disposal studies. Currently, groundwater in the deep aquifer system mainly ranges between NaHCO3 type and NaCl type. Because of the low groundwater velocity in this aquifer system, re-equilibration with the mineralogical composition of the host formations generally occurs. The main geochemical indicators point out that the current formation waters are a mixture between the original saline marine porewaters and freshwater recharge. SE-NW gradients of increasing ion concentrations are observed and can be explained in agreement with the pattern of natural groundwater flow. Calcite dissolution and cation exchange are still ongoing in this freshening aquifer system. A low sulphate content in the deep aquifer system indicates sulphate reduction associated with organic matter degradation. Inverse modelling along a flow path using PHREEQC generally confirms the reactions that have been derived in the data analysis.

AB - Geochemical data from the deep aquifer system below the Boom Clay in NE-Belgium have been collected and reinterpreted. The data were obtained between 1980 and 2014 within the framework of radioactive waste disposal studies. Currently, groundwater in the deep aquifer system mainly ranges between NaHCO3 type and NaCl type. Because of the low groundwater velocity in this aquifer system, re-equilibration with the mineralogical composition of the host formations generally occurs. The main geochemical indicators point out that the current formation waters are a mixture between the original saline marine porewaters and freshwater recharge. SE-NW gradients of increasing ion concentrations are observed and can be explained in agreement with the pattern of natural groundwater flow. Calcite dissolution and cation exchange are still ongoing in this freshening aquifer system. A low sulphate content in the deep aquifer system indicates sulphate reduction associated with organic matter degradation. Inverse modelling along a flow path using PHREEQC generally confirms the reactions that have been derived in the data analysis.

KW - confined aquifers

KW - hydrogeochemistry

KW - PHREEQC

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/19500209

U2 - 10.1144/SP443.7

DO - 10.1144/SP443.7

M3 - Special issue

VL - 443

JO - Geological Society, London, Special Publications

JF - Geological Society, London, Special Publications

SN - 0305-8719

ER -

ID: 1370570