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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

Short note

GEOISO—A Windows TM

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 Departamento de Geologia da Faculdade de Cie

ˆncias da Universidade do Porto,Rua do Campo Alegre,687,4169-007Porto–Portugal b

Centro de Investigac -a ˜o Geolo ´gica,Ordenamento e Valorizac -a ˜o de 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 specific geologic 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 files and to cover the majority of the open system geologic situations.Geoiso is written in JustBasic V 1.0and is available from the IAMG server.

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 ‘perfectly inert’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:

X n ¼f v ðg B =g A ÞC B n ÀC A

n ÂÃa ,(1)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 ‘‘volume factor’’,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.

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

0098-3004/$-see front matter r 2006Elsevier Ltd.All rights reserved.doi:10.1016/j.cageo.2006.01.008

$

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

ÃDepartment of Geology,Faculdade de Cie n
cias Porto,Rua do Campo Alegre,687,4169007Porto,Portugal.Tel.:+3512200114539:fax:+351222056456.E-mail address:jmcoelho@fc.up.pt.1

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.1

A chemical component that does not participate in the chemical reactions.It’s quantity 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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