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Alligator Rivers Analogue project. Geochemical modelling of present-day groundwaters. Final Report - Volume 12

Abstract

The main purpose of this report is to summarize geochemical modeling studies of the present-day Koongarra groundwaters. Information on the present-day geochemistry and geochemical processes at Koongarra forms a basis for a present-day analogue for nuclear waste migration. The present-day analogue is built on studies of the mineralogy and petrology of the Koongarra deposit, and chemical analyses of present-day groundwaters from the deposit. The overall approach taken in the present study has been to carry out a series of aqueous speciation and state of saturation calculations, including chemical mass transfer calculations, to address the possible control over the chemistry of the present-day for the groundwaters at Koongarra. The most important implication of the present study for the migration of radionuclides is the strong role played by the water-rock interactions, both above and below the water table, influencing the overall chemical evolution of the groundwaters. Thus, the results show that the chemical evolution of waters is strongly controlled by the initial availability of CO{sub 2} and the mineral assemblage encountered, which together determine the major element evolution of the waters by controlling the pH. The relative rates of evolution of the pH and the oxidation state of the groundwaters are also  More>>
Authors:
Sverjensky, D A [1] 
  1. The John Hopkins Univ, Dept of Earth and Planetary Sciences, Baltimore (United States)
Publication Date:
Dec 31, 1992
Product Type:
Miscellaneous
Report Number:
INIS-AU-0022; DOE/HMIP/RR-92/082; SKI-TR-92/20/12
Reference Number:
SCA: 050100; 540230; PA: AIX-30:004647; EDB-99:022944; SN: 99002061774
Resource Relation:
Other Information: DN: 22 refs., 7 tabs., 18 figs.; PBD: 1992
Subject:
05 NUCLEAR FUELS; 54 ENVIRONMENTAL SCIENCES; GEOCHEMISTRY; GEOLOGIC MODELS; GROUND WATER; HYDROTHERMAL ALTERATION; KOONGARRA DEPOSIT; NATURAL ANALOGUE; RADIONUCLIDE MIGRATION; ROCK-FLUID INTERACTIONS; SIMULATION; THEORETICAL DATA; THERMODYNAMIC MODEL; URANIUM ORES; WATER CHEMISTRY; WATER TABLES; WEATHERING
Sponsoring Organizations:
Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW (Australia); Nuclear Energy Agency, 75 - Paris (France); Power Reactor and Nuclear Fuel Development Corp., Tokyo (Japan); Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan); Swedish Nuclear Power Inspectorate, Stockholm (Sweden); Nuclear Regulatory Commission, Washington, DC (United States); Department of the Environment, London (United Kingdom)
OSTI ID:
310062
Research Organizations:
Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW (Australia)
Country of Origin:
Australia
Language:
English
Other Identifying Numbers:
Other: ON: DE99612872; TRN: AU9917762004647
Availability:
INIS; OSTI as DE99612872
Submitting Site:
AUN
Size:
78 p.
Announcement Date:

Citation Formats

Sverjensky, D A. Alligator Rivers Analogue project. Geochemical modelling of present-day groundwaters. Final Report - Volume 12. Australia: N. p., 1992. Web.
Sverjensky, D A. Alligator Rivers Analogue project. Geochemical modelling of present-day groundwaters. Final Report - Volume 12. Australia.
Sverjensky, D A. 1992. "Alligator Rivers Analogue project. Geochemical modelling of present-day groundwaters. Final Report - Volume 12." Australia.
@misc{etde_310062,
title = {Alligator Rivers Analogue project. Geochemical modelling of present-day groundwaters. Final Report - Volume 12}
author = {Sverjensky, D A}
abstractNote = {The main purpose of this report is to summarize geochemical modeling studies of the present-day Koongarra groundwaters. Information on the present-day geochemistry and geochemical processes at Koongarra forms a basis for a present-day analogue for nuclear waste migration. The present-day analogue is built on studies of the mineralogy and petrology of the Koongarra deposit, and chemical analyses of present-day groundwaters from the deposit. The overall approach taken in the present study has been to carry out a series of aqueous speciation and state of saturation calculations, including chemical mass transfer calculations, to address the possible control over the chemistry of the present-day for the groundwaters at Koongarra. The most important implication of the present study for the migration of radionuclides is the strong role played by the water-rock interactions, both above and below the water table, influencing the overall chemical evolution of the groundwaters. Thus, the results show that the chemical evolution of waters is strongly controlled by the initial availability of CO{sub 2} and the mineral assemblage encountered, which together determine the major element evolution of the waters by controlling the pH. The relative rates of evolution of the pH and the oxidation state of the groundwaters are also critical to the mobility of uranium. The shallow Koongarra waters are sufficiently oxidising that they can dissolve and transport uranium even under acidic conditions. Under the more reducing condition of the deep groundwaters, is the pH level that permits uranium transport as carbonate complexes. However, if the oxidation state decreases to much lower levels, it would be expected that uranium become immobile. All the speciation and state of saturation calculations carried out in the present study are available from the author, on request 22 refs., 7 tabs., 18 figs.}
place = {Australia}
year = {1992}
month = {Dec}
}