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1、Workshop1One-dimensionalsimulationofshallowmarinestratigraghicarchitectureresultingfromtheinteractionsamongeustasy,tectonic,subsidenceandsedimentsupplyObjective:Toexamine,throughgraghicalone-dimensionalmodeling,theconceptsofeustasy,tectonicsubsidence,sedimentsupplyorproduction,resultant
2、changesinwaterdepthandaccommodationpotential.Theinteractionsofthesefundamentalprocessesgovernthegeometryandlithofaciesdistributionsofgeneticsequences.Procedures:Wewillassumeanhypotheticaleustaticcurve,aconstantrateoftectonicsubsidence,andaconstantrateofsedimentsupplyanderosion.Wewillass
3、umealsothatweareexaminingtheresultsoftheseinteractionsonashallowmarineshelfofapassivecontinentalmargin.1.Figure1showsahypotheticaleustaticcurve.Inflectionpointsonthecurvearelabeled1-4.Theratesofchanges(firstderivativesofthecurveateachpoint)aregivenas:1:-1.5m/1000yr2:+2.0m/1000yr3:-2,5m/
4、1000yr4:+1.0m/1000yr2.Whataretheratesofeustaticchangeatpointsa,b,candd?Labelthem3.Onfigure2,plottheratesofeustaticchange.4.Letusdefine“accommodationpotential”asthecontinuouslyvarying,cumulativevolumebeingcreatedorremovedbytheinteractionofeustaticchangeandtectonicsubsidence.Thisvolumeist
5、hemaximumlimitofsedimentfillataparticularlocationthroughtimeincrements.Wemightalsodefine“accommodationrate”astheincrementaladditionorremovalofspaceperunittime.Assumethattectonicsubsidenceatthispositionontheshelfisaconstantvalueof20cm/1000yr.Onfigure2,inanothercolor,drawthecurveofaccommo
6、dationrate[usethesamescalarunitsasshownontheleftsideofthefigure].5Onfigure3,plotthecumulativetectonicsubsidenceassumingagainthattectonicsubsidenceatthispositionontheshelfisaconstantvalueof20cm/1000yr.Assumetheoriginofthesubsidencecurveiszero.6Againassumingthattectonicsubsidenceatthispos
7、itionontheshelfisaconstantvalueof20cm/1000yr,plotrelativesealevelonfigure4.Asthisisthesumofeustasyandtectonicsubsidence,thiscurveshowsthechangesinsealevelwithrespecttoaclamthatisburiedinthesedimentattheoriginoftheplot.Itshowswaterdepthonlyforthecasethatnosedimentisaddedtothesea
