GEOCHEM program

The high density (approximately 1 sample per 3 km2) lake sediment geochemical program at the Ontario Geological Survey takes advantage of the greater than... 

Debraal, J. D., and Y. K. Kharaka. 1989. SOUNPVT A Computer code to create and modify input files for the geochemical program SOLMINEQ.. Open-Kle Report 89-616. Menlo Park, CA U.S. Geol. Survey. 

The Geochemist s Workbench . A collection of five geochemical programs by C.M. Bethke and his group at the University of Illinois, capable of performing virtually all options we discuss (except coupled reactive transport), with graphical output (Bethke, 1994, 1996). Inquiries should be directed to... 

Many different geochemical programs exist which address some of the processes and complications previously mentioned. A few of the programs currently available and commonly used include PATH and it s modified versions U-2), SOLMNEQ and it s modified versions (1-4), WATEQ and it s modified versions (1- -7), MINEQL (S), EQ3/EQ6 PHREEQE (12), GEOCHEM... 

Frequently, many laboratories around the world are joint participants in major geochemical studies. One example already mentioned is the lunar program of almost... 

Kane JS (1991) Review of geochemical reference sample programs since G-i and W-i progress to date and remaining challenges. Spectrochim Acta 463 1623-1638. 

Cherdyntsev W (1971) Uranium-234. Israel Program for Scientific Translations, Jerusalem Cochran JK, Masque P (2003) Short-lived U/Th-series radionuclides in the ocean tracers for scavenging rates, export fluxes and particle dynamics. Rev Mineral Geochem 52 461-492 Copenhaver SA, Krishnaswami S, Turekian KK, Shaw H (1992) and Th series nuclides in groundwater from the J-13 well at the Nevada test site implications for ion retardation. Geophys Res Lett 19 1383-1386... 

Parkhurst DL.andAppeloCAJ. User s guide to PHREEQC (version 2)-A comuter program for speciation, batch-reaction, one-dimentional transport and inverse geochemical calculations. 1999 US Geological Survey Water-Resources Investigations Report 99-4259. 

Garrels and Thompson s calculation, computed by hand, is the basis for a class of geochemical models that predict species distributions, mineral saturation states, and gas fugacities from chemical analyses. This class of models stems from the distinction between a chemical analysis, which reflects a solution s bulk composition, and the actual distribution of species in a solution. Such equilibrium models have become widely applied, thanks in part to the dissemination of reliable computer programs such as SOLMNEQ (Kharaka and Barnes, 1973) and WATEQ (Truesdell and Jones, 1974). 

The following is a list, current at the time of publication, of sources of some of the most popular geochemical modeling software programs and packages. Some of the packages are available for download at no cost, whereas others may be licensed for a fee. 

Karpov, I. K., L. A. Kaz min and S. A. Kashik, 1973, Optimal programming for computer calculation of irreversible evolution in geochemical systems. Geochemistry International 10,464 170. 

Kharaka, Y. K., W. D. Gunter, P. K. Aggarwal, E. H. Perkins and J. D. DeBraal, 1988, Solmineq.88, a computer program for geochemical modeling of water-rock interactions. US Geological Survey Water Resources Investigation Report 88—4227. 

Parker, D.R., W. A. Norvell and R. L. Chaney, 1995, GEOCHEM-PC, a chemical speciation program for IBM and compatible personal computers. In R. H. Loep-pert, A. P. Schwab and S. Goldberg (eds.), Chemical Equilibrium and Reaction Models. Soil Science Society of America Special Publication 42,253-269. 

Parkhurst, D. L., D. C. Thorstenson and L. N. Plummer, 1980, Phreeqe - a computer program for geochemical calculations. US Geological Survey Water-Resources Investigations Report 80-96. 

Plummer, L. N., D.L. Parkhurst, G. W. Fleming and S. A. Dunkle, 1988, PHRQPITZ, a computer program incorporating Pitzer s equations for calculation of geochemical reactions in brines. US Geological Survey Water-Resources Investigations Report 88—4153. 

Wolery, T. J., 1983, Eq3nr, a computer program for geochemical aqueous speciat-ion-solubility calculations user s guide and documentation. Lawrence Livermore National Laboratory Report UCRL-53414. 

Xu, T., E.L. Sonnenthal, N. Spycher and K. Pruess, 2004, TOUGHREACT user s guide A simulation program for non-isothermal multiphase reactive geochemical transport in variably saturated geologic media. Report LBNL-55460, Lawrence Berkeley National Laboratory, Berkeley, California. 

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