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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&Geosciences32(2006)1523–1528

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

GEOISO—AWindowsprogramtocalculateandplotmassbalancesandvolumechangesoccurring

inawidevarietyofgeologicprocesses$

JoaoCoelhoa,b,Ã

ab

Shortnote

TM

ˆnciasdaUniversidadedoPorto,RuadoCampoAlegre,687,4169-007Porto–PortugalDepartamentodeGeologiadaFaculdadedeCie

´gica,OrdenamentoeValorizacCentrodeInvestigac-a˜oGeolo-a˜odeRecursos(CIG-R),CampusdeGualtar,4710-057Braga,Portugal

Received1June2005;receivedinrevisedform19January2006;accepted20January2006

1.Introduction

GeoisoisacomputerprogramforWindowsTM

platformsthatcalculatesandplotsthemassandvolumechangesthatcanoccurinawidevarietyofopensystemgeologicalprocesses.

Mostoftheavailablecomputerprogramscon-cerningmassbalanceandvolumechangesmainlydealwithspecificgeologicsituations,asisthecaseofShearcalc(Sturm,2003)orrunonnon-WindowsenvironmentssuchasGresens92(Potdevin,1993).SomeotherknownprogramsruninaWindowsDOSshell,asinthecaseofNewGres(LeitchandDay,1990).

Geoisowasdevelopedwiththefollowingobjectives:theexclusiveuseoffreewareprogramminglanguages;tohaveaneasy,fastandintuitivewindowsenviron-ment;toworkwithsimpledataandimagefilesandtocoverthemajorityoftheopensystemgeologicsituations.GeoisoiswritteninJustBasicV1.0andisavailablefromtheIAMGserver.

Codeavailablefromserverathttp://www.doczj.com/doc/91b79c70aef8941ea66e053f.html /CGEditor/index.htm.

ÃDepartmentofGeology,FaculdadedeCienciasPorto,RuadoCampoAlegre,687,4169007Porto,Portugal.Tel.:+3512200114539:fax:+351222056456.E-mailaddress:jmcoelho@fc.up.pt.0098-3004/$-seefrontmatterr2006ElsevierLtd.Allrightsreserved.doi:10.1016/j.cageo.2006.01.008

$

2.Theoreticalbackground

Gresens(1967)proposestheuseofmathematicalexpressionsforthecalculationofgainandlossofmaterialforopensystemtransformations.Admit-tingthatinsuchareactionthereare‘perfectlyinert’1chemicalcomponents(Fonteilles,1978),GresensshowsthatthetransformationofagenericrockAintoanalsogenericrockBcanbeexpressedbythefollowingexpression:

ÂÃA

ÀCXn¼fvðgB=gAÞCB(1)nna,where‘‘X’’isthemasschangeofcomponent‘‘n’’

relativeto‘‘a’’,‘‘n’’theconsideredcomponent,‘‘g’’thedensitiesofeachrock,‘‘v’’thevolumeofeachrock,‘‘fv’’avolumefactor,‘‘a’’themassoftheoriginalsample(A)and‘‘C’’theconcentration.Gresensdeterminesgraphicallythe‘‘volumefactor’’,fv(Gresens,1967).Knowingfvitispossibletocalculatethe
massvariationforeachcomponent.Evenifefficient,theGresensmethodisneithereasynorpracticaltouse.Grant(1986)proposedamoredirectandeasierprocessofusingGresensequation.

relativeto‘‘a’’,‘‘n’’theconsideredcomponent,‘‘g’’thedensitiesofeachrock,‘‘v’’thevolumeofeachrock,‘‘fv’’avolumefactor,‘‘a’’themassoftheoriginalsample(A)and‘‘C’’theconcentration.Gresensdeterminesgraphicallythe‘‘volumefactor’’,fv(Gresens,1967).Knowingfvitispossibletocalculatethemassvariationforeachcomponent.Evenifefficient,theGresensmethodisneithereasynorpracticaltouse.Grant(1986)proposedamoredirectandeasierprocessofusingGresensequation.

Achemicalcomponentthatdoesnotparticipateinthechemicalreactions.It’squantityinthesystemdoesnotchangeduringthereactionprocesses.Howeveritsconcentrationisafunctionoftheconcentrationsoftheotherelements.

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