27453.中揚子地區(qū)二疊紀(jì)構(gòu)造古地理研究

1、合肥工業(yè)大學(xué)博士學(xué)位論文中揚子地區(qū)二疊紀(jì)構(gòu)造古地理研究姓名：萬秋申請學(xué)位級別：博士專業(yè)：礦物、巖石、礦床學(xué)指導(dǎo)教師：李雙應(yīng)201105AbatractBasedonthemeasuredPermiansectioninthedleYangtzeregionaccdingtostratigraphiclithofaciessedimentaryfaciesanalysispetrologysedimentarygeochemicaloth

2、ermethodsmicrofaciesanalysisasabasicmeansofthemeasuredprofilecombinationofmeasuredprofilemicrofaciesanalysisPermianintheYangtzeregionacteristicslithologysedimentaryacteristicspalaeogeographichavebeensystemlystudied.Evolu

3、tionofsedimentaryenvironmentsdepositionmodelshavebeenfoundedtherelationshipbeweensedimentarytectonicevolutionhasbeendephlydiscussed.LowerPermianismissinginapartofstudyareaonlyexposedinthesoutheasternwesternHubeinthwester

4、nHunan.ThethicknessofdlePermianisgraduallythinningfromsouthtonthlithofaciesshowagradientrelationsfromsouthtonthbytheshallowmarinelimestonetothebathyaldeepseasiliceouslimestonesiliceousrockdepthofseagraduallybecomesdeeper

5、fromsouthtonth.UpperPermianmainlyfmedbythecarbonaterocksLongtanWujiapingfmationChangxingDalongfmationissamephasedifferentfacieswhichreflectingthedepositionoftheLatePermiandifferentiation.Accdingtothesedimentaryenvironmen

6、tanalysisthreeprimarykindsofsedimentaryenvironmentswereidentifiedwhichincluderampplatfmbasin.LowerUpperPermianhavemainlydepositedonthecarbonateplatfmthedlePermianhavemainlydepositedontherampbasin.Typesofgravityflowdeposi

7、tshavebeenfoundinMaokouFmationdlePermianwesternHubeifromtoptobottomslumpdepositsdebrisflowdeposits.ThesedimentaryevolutionindicatesthattwosedimentarycyclesoftransgressionregressionoccurredinthePermian:LowerdlePermiandleU

8、pperPermian.Byuseofmeasuredsectionmicrofaciesanalysis12kindsofmicrofaciescanberecognized:bioclasticgrainstonemudstonemicritecalcisiltitebcalcirudsilicaetc.Microfaciesanalysisshowswidelydevelopedcalciruditeinthestudyareai

9、sallochthonousinsteadofdifferentialcompactioncauses.EarlyPermiantheseahasnotyetfullyperatedthestudyareapartofstudyareaisstilllsoutheastofthestudyareaisrestrictedplatfmopenplatfmdeposition.Qixiaiansuffersextensivetransgre

10、ssioninthedlePermianinthenthernmarginofthedleYangtzeistheouterramp–deepwaterbasininthemaindleYangtzecratonisrampdepositionsomeareaiscarbonateplatfmfacieswesternHubeitroughisouterrampMaokouantransgressionisaggravatedthent

11、hernmarginofthedleYangtzeisdeepbasinthecompensationisextended.RampremainsinthemaindleYangtzeareawesternHubeibecomestodeepwaterbasin.platfmramp–deepwaterbasinfromsouthtonthbuildupacarbonaterampdepositionalsysteminthestudy