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GEOISO—A WindowsTM program to calculate and

GEOISO—A WindowsTM program to calculate and

GEOISO—A WindowsTM program to calculate and

Computers &Geosciences 32(2006)1523–1528

http://www.doczj.com/doc/91b79c70aef8941ea66e053f.html /locate/cageo

GEOISO—AWindows program to calculate and plot mass balances and volume changes occurring

in a wide variety of geologic processes $

Joa o Coelho a,b, Ã

a b

Short note

TM

ˆnciasda Universidade do Porto, Rua do Campo Alegre, 687,4169-007Porto–Portugal Departamento de Geologia da Faculdade de Cie

´gica,Ordenamento e Valorizac Centro de Investigac -a ˜oGeolo -a ˜ode Recursos (CIG-R),Campus de Gualtar, 4710-057Braga, Portugal

Received 1June 2005; received in revised form 19January 2006; accepted 20January 2006

1. Introduction

Geoiso is a computer program for Windows TM

platforms that calculates and plots the mass and volume changes that can occur in a wide variety of open system geological processes.

Most of the available computer programs con-cerning mass balance and volume changes mainly deal with specificgeologic situations, as is the case of Shearcalc (Sturm, 2003) or run on non-Windows environments such as Gresens 92(Potdevin, 1993). Some other known programs run in a Windows DOS shell, as in the case of NewGres (Leitch and Day, 1990).

Geoiso was developed with the following objectives:the exclusive use of freeware programming languages; to have an easy, fast and intuitive windows environ-ment; to work with simple data and image filesand to cover the majority of the open system geologic situations. Geoiso is written in JustBasic V 1.0and is available from the IAMG server.

Code available from server at http://www.doczj.com/doc/91b79c70aef8941ea66e053f.html /CGEditor/index.htm .

ÃDepartment of Geology, Faculdade de Cie ncias Porto, Rua do Campo Alegre, 687,4169007Porto, Portugal. Tel.:+3512200114539:fax:+351222056456. E-mail address:jmcoelho@fc.up.pt.0098-3004/$-see front matter r 2006Elsevier Ltd. All rights reserved. doi:10.1016/j.cageo.2006.01.008

$

2. Theoretical background

Gresens (1967)proposes the use of mathematical expressions for the calculation of gain and loss of material for open system transformations. Admit-ting that in such a reaction there are ‘perfectlyinert’1chemical components (Fonteilles, 1978), Gresens shows that the transformation of a generic rock A into an also generic rock B can be expressed by the following expression:

ÂÃA

ÀC X n ¼f v ðg B =g A ÞC B (1)n n a , where ‘‘X ’’is the mass change of component ‘‘n ’’

relative to ‘‘a ’’,‘‘n ’’the considered component, ‘‘g ’’the densities of each rock, ‘‘v ’’the volume of each rock, ‘‘f v ’’a volume factor, ‘‘a ’’the mass of the original sample (A)and ‘‘C ’’the concentration. Gresens determines graphically the ‘‘volumefactor’’,f v (Gresens, 1967). Knowing f v it is possible to calculate the mass variation for each component. Even if efficient,the Gresen
s method is neither easy nor practical to use. Grant (1986)proposed a more direct and easier process of using Gresens equation.

relative to ‘‘a ’’,‘‘n ’’the considered component, ‘‘g ’’the densities of each rock, ‘‘v ’’the volume of each rock, ‘‘f v ’’a volume factor, ‘‘a ’’the mass of the original sample (A)and ‘‘C ’’the concentration. Gresens determines graphically the ‘‘volumefactor’’,f v (Gresens, 1967). Knowing f v it is possible to calculate the mass variation for each component. Even if efficient,the Gresens method is neither easy nor practical to use. Grant (1986)proposed a more direct and easier process of using Gresens equation.

A chemical component that does not participate in the chemical reactions. It’squantity in the system does not change during the reaction processes. However its concentration is a function of the concentrations of the other elements.

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