15919.晚中新世以來(lái)蘇北盆地沉積物石榴石水系示蹤研究

1、學(xué)位論文獨(dú)創(chuàng)性聲明本人鄭重聲明：所提交的學(xué)位是本人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作和取得的研究成果。本論文中除引文外，所有實(shí)驗(yàn)、數(shù)據(jù)和有關(guān)材料均是真實(shí)的。本論文中除引文和致謝的內(nèi)容外，不包含其他人或其它機(jī)構(gòu)已經(jīng)發(fā)表或撰寫(xiě)過(guò)的研究成果。其他同志對(duì)本研究所做的貢獻(xiàn)均己在論文中作了聲明并表示了謝意。學(xué)位論文作者簽名：日期：)。Ilfr諺學(xué)位論文使用授權(quán)聲明研究生在校攻讀學(xué)位期間論文工作的知識(shí)產(chǎn)權(quán)單位屬南京師范大學(xué)。學(xué)校有權(quán)保存本學(xué)位論文的電子和紙質(zhì)

2、文檔，可以借閱或上網(wǎng)公布本學(xué)位論文的部分或全部?jī)?nèi)容，可以采用影印、復(fù)印等手段保存、匯編本學(xué)位論文。學(xué)校可以向國(guó)家有關(guān)機(jī)關(guān)或機(jī)構(gòu)送交論文的電子和紙質(zhì)文檔，允許論文被查閱和借閱。(保密論文在解密后遵守此規(guī)定)保密論文注釋?zhuān)罕緦W(xué)位論文屬于保密論文，保密期限為年。學(xué)位論文作者簽名：韻乒馭嗓指導(dǎo)教師簽名：Et期：猻～孓蚤FEt期：7嚕砂彳陽(yáng)心yt孑abstractAbstractStudyareaXH2iSloratedinSubeiBasinS

3、ubeiBasinexperiencedthebreakingandthedepressiondepositedthicksedimentsThesesedimentsrecordtheprovenanceofSubeiBasintracerandstreamsadjustmentinformationInthispaperthechoiceisheavymineralgarnetelectronprobeprovenancetraci

4、ngmethodByelectronmicroprobeanalysisofgarnetsingleparticlechemicalcompositionofheavymineralscallhelpidentifythesourceareaandtodeterminetheprovenanceofincreasedcredibilityWeselectXH2(Xinghua2drilling)asthemainobjectofstud

5、yThedepthis750malldtimespanisabout775Ma，wecollect10samplesofXH2，and8samplesoftheHuaiheRiverandYangtzeRiverdownstreamriverbasinUsingMineralgarnetsingleelectronmicroprobeanalysis，andcombiningtheresultsofpreviousstudieshave

6、beenconductedcomparativeanalysisrevealtheriveradjustmentandtheprovenancechangesinthesubeibasinsinceabout8MaAccordinggarnetelectronmicroprobedataanalysis，garnetendmembersofHuaiheRiverandYangtzeRiverhaveobviousdifferencesT

7、hecrystalformsofgarnetsaremainlyAlmandinePyropeinHuaiheRiverBasinandtheformsaremainlyAlmandine—Spessartite，Almandine—GrossularinYangtzeRiveritcanbedividedintosixsectionsofXH2：segmentI(74541m630m；775Ma655Ma)theformsofgarn

8、etsaremainlyaimpyr，consistentwiththeformsofHuaiheRiverBasinThisphaseismainlyaffectedbytheHuaiheRiverBasin；segmentII(630m500m，655Ma520Ma)theformsaremainlyaimSpeaim—gro，withtheYangtzeRiverGarnetconsistenttypeThisphaseismai

9、nlyaffectedbytheYangtzeRiver；segmentIll(500m410m，520Ma425Ma)theformsaremainlyaimpyralmspe，aimgro，thisphaseismainlyaffectedbythecombinedeffectoftheHuaiheRiverandYangtzeRiver：segmentI、『(410m330m425Ma一342Ma)theformsofgarnet

10、saremainlyaim—pyrthisstageismainlyaffectedbytheHuaiheRiverBasin；segmentV(330m270m，342Ma一2gOMa，)theformsaremainlyaimpyralm—spe，aimgro，thisstageismainlyaffectedbytheHuaiheRiverandYangtzeRiver；paragraphVI(270m0，280Ma—now)th

11、eformsofgarnetsaremainlyaim—pyrthisstageismainlyaffectedbytheHuaiheRiverBasininadditiontheYangtzeriverwatersystemflowedtotheseathrouIghsubeibasinbynotlaterthan6MaandthentheYangtzedownstreamriverdivertedtrafficsouthward，f