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1、Workshop1One-dimensionalsimulationofshallowmarinestratigraghicarchitectureresultingfromtheinteractionsamongeustasy,tectonic,subsidenceandsedimentsupplyObjective:Toexamine,throughgraghicalone-dimensionalmodeling,theconceptsofeustasy,tectonicsubsidence,sedimentsupplyorprodu
2、ction,resultantchangesinwaterdepthandaccommodationpotential.Theinteractionsofthesefundamentalprocessesgovernthegeometryandlithofaciesdistributionsofgeneticsequences.Procedures:Wewillassumeanhypotheticaleustaticcurve,aconstantrateoftectonicsubsidence,andaconstantrateofsedi
3、mentsupplyanderosion.Wewillassumealsothatweareexaminingtheresultsoftheseinteractionsonashallowmarineshelfofapassivecontinentalmargin.1.Figure1showsahypotheticaleustaticcurve.Inflectionpointsonthecurvearelabeled1-4.Theratesofchanges(firstderivativesofthecurveateachpoint)ar
4、egivenas:1:-1.5m/1000yr2:+2.0m/1000yr3:-2,5m/1000yr4:+1.0m/1000yr2.Whataretheratesofeustaticchangeatpointsa,b,candd?Labelthem3.Onfigure2,plottheratesofeustaticchange.4.Letusdefine“accommodationpotential”asthecontinuouslyvarying,cumulativevolumebeingcreatedorremovedbythein
5、teractionofeustaticchangeandtectonicsubsidence.Thisvolumeisthemaximumlimitofsedimentfillataparticularlocationthroughtimeincrements.Wemightalsodefine“accommodationrate”astheincrementaladditionorremovalofspaceperunittime.Assumethattectonicsubsidenceatthispositionontheshelfi
6、saconstantvalueof20cm/1000yr.Onfigure2,inanothercolor,drawthecurveofaccommodationrate[usethesamescalarunitsasshownontheleftsideofthefigure].5Onfigure3,plotthecumulativetectonicsubsidenceassumingagainthattectonicsubsidenceatthispositionontheshelfisaconstantvalueof20cm/1000
7、yr.Assumetheoriginofthesubsidencecurveiszero.6Againassumingthattectonicsubsidenceatthispositionontheshelfisaconstantvalueof20cm/1000yr,plotrelativesealevelonfigure4.Asthisisthesumofeustasyandtectonicsubsidence,thiscurveshowsthechangesinsealevelwithrespecttoaclamthatisburi
8、edinthesedimentattheoriginoftheplot.Itshowswaterdepthonlyforthecasethatnosedimentisaddedtothesea
