湖北宜昌黃花場奧陶紀地層與沉積相分析.pdf

1、分類號：P57W58＼P611071020050898壤步犬海碩士學位論文導師姓名職稱申請學位級別論文提交日期學位授予單位湖北宜昌黃花場奧陶紀地層與沉積相分析高雪蓮蘇春乾副教授楊志華教授碩士學科專業(yè)名稱礦物學、巖石學、礦床學——論文答辯日期——長安大學答辯委員會主席學位論文評閱人AbstractYichangcityislocatedinwesternHubeiProvince，issituatedatintersectionpoint

2、ofupstreamYangtzeRiverandthemiddlereaches，thetransitionzonefrommountainareatotheplainareaTakingQingfengXiangguangfractureasdemarcationline，itcandivideintosouthemYangzistrataareaandnorthernSouthQinling—DabieMountainstrata

3、area，YichangislocatedontheYangzistratadistrict，thegeologicalchangearefewthestratadistributionisextensive，fromtheProterozoicgroups1800MaagotoCenozoicgroups1Maago，alsothegrowthintegrityappearingiscompleteThisresearchareaof

4、YichangHuanghuachangislocatedtheeastlimboftheHuanglinganticline，isinthemiddle—northoftheYangzicarbonateplatforminOrdovicianNotonlytheHuanghuachangOrdoviciansystemsectionplanethestructureissimple，thestratagrowthisintegrit

5、yeachclassoffossilisalsoextremelyrich，theresearchdegreeishigh，isalsothetypicalprofileofOrdoviciansystemdivisionandthecontrast，butalsoistheboundarystratotypesectionofDawanstage，simultaneouslytheglobalmostperfectboundaryst

6、ratotypesectionofmiddle10werOrdovicianThroughthegeologysurveyintheopenairandstudyingandcontrastingOrdoviciansystemstratadivision，thelothologicalcharacteristics，speciallythesedimentaryfaciessymbolresearch，connectingwithpr

7、edecessorsresearchresults，ithasestablishedtheYichangHuanghuachangdepositionfaciesmodelofOrdovicianperiodrestoredtheenvironmentofdepositionthen，hasmadecleartheevolutionofpaleogeographyandthefluctuationchangeofsealevelthen

8、Ordovicianperiod，epicontinentalseaspreadouttheHuanghuachangareainYichang，Hubeiprovince，itischaracteristicsofbroaddistribution，shallowseawaterandgentleseabedslope，indicatesthatisstablesurroundings，formingthesuitstratumtha

9、tismainlycarbonatiteThesedimentmodeisbelongstoshoreepicontinentalsea、Scarbonatiteassembleprincipallyincludingbasinfacies，widecontinentalshelffacies，basinmarginalfacies，mesamarginalbiohermalfacies，mesamarginalrifflefacies

10、，wideseamesafaciesandlimitedseamesafaciesThetransgressioncontinuousexpandingandseawaterconstantdeepingfromXilinxiaFormationtoWufengFormation，andhavemulti—gyrephenomenoninseawateradvanceandretreatTheaggradationisdividedin