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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—AWindows 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

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

Centro de Investigac -a ˜oGeolo ´gica,Ordenamento e Valorizac -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.

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:

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 ‘‘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.

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 ncias P
orto, 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’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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