川雅安地区第四纪以来活动构造及青衣江水系演化-构造地质学专业毕业论文

《川雅安地区第四纪以来活动构造及青衣江水系演化-构造地质学专业毕业论文》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、成都理工大学硕士学位论文发生明显的改道。II级阶地在此期间形成。4晚更新世中期(Q。2)——全新世(Q。)由于熊坡背斜继续隆起和名、邛台地南端的抬升，青衣江在罗坝以西切断熊坡背斜南端改道南东东，之后相遇丹、思砾石层II级阶地，从北端绕道转向南东流，至此两套砾石层的I级阶地开始沉积。5全新世(Q。)三苏场背斜北端和丹、思盆地的抬升，青衣江在次被阻断，在夹江以西切断三苏场背斜向南改道南东。关键字：青衣江活动构造阶地砾石层水系演化IIAbstrzIctTHENEoTECToNICMoVEMENTFRoMTHEQUATERNARYPERloDANDT

2、HE、)I，ATERSYSTEMEVoLVEMENTOFTHEQINGYIJANGIUVERVfd山LEYINSICHUAN111臼-oductionoftheauthor：Y-啪iunjie，male，wasbomi11Se仃nber’l981whosetIJtor、Ⅳ舔Professor1’aoxiaofeng．Hegraduated舶mChengduUniverS时ofTecllllologyintectomcsm萄orandwaLsgr趾tedtheMaSterDegreeiIlJune，2008．Abstract111eQing)r

3、ijiallg鼬Verissi似edintheeastemmargiIloft11eQin曲ai—Tibet，WhereexistsmultileVelriVertemcesilltlleY．踟areai11tlleso砒oftheChengdubaSin．n1盯e玳觚Dm勾orgraVelbeds，wKchareMingsh鲫-Qiongl面GraVelBed锄dDallleng—SimengGraVelBed，d印ositedontllebaseoftllesete：rraces．TheriverterraCealldtlle铲aVelb

4、edsarenotoIllyt11erecordoft11ehydrodynaImcforcecondition砒ldmeorigmofdeposit，butalsom如g也elocalteCtoIlicactivi够aIldthecliIIlatechaIlges．Af渤‘thesurVeyof也eriVer钯眦屺es，wegettlle试fomationofnle1ayom，tlleheight弛dtheageoftllete玎aces．A舭rmesurVeyof伊avelbeds，weknowt11eareaandⅡ1eageofⅡ圮咖

5、graVelbeds，mein印甜ie咄孕趾ul耐劬orientationofthe孕aVels．AndaccordingⅡlis，wediscusstheevolutionofnlew咖rsyst锄ofQmg)riji锄griVer．TheresultsaregiViIlgjust笛follo、订ng：1)Theriverten．acesExceptforⅡ圮terraceI，whichisacc啪ulatiorlalterrace，allotherterracesarebottomtemces．Thenmnberofterracesdif

6、rerSf如monedrainageareat0anotller．Ant)，peis廿leCaoba-WhguterracesWIlichh弱4terraces，aIldinYangping，onthesou_cllofHongya，tllereare3terraces．WbkⅣesun，eythedinbrentterracesaIldgotthedataoftheirheightandage，basedon、v11ich、^rehavecalculatedtIleincisionrateofQing)，ijingriveraIlduplm

7、rateoftlleten．acesindi能remperiod．2)1kgraVelbedsneyarenuvi鲥gravelbeds，谢t11t11echarcterofduals仃ucture．neingredientSareq咖ite，伊anite，dioritc，dolerite，sandStone锄dlaVa．Thediamateroftheg阳lVelsisinthemgeof1-40cm，mostlyin5—25cm．Thepsepllici够isgoodbuttllesortingcoef矗cientislow．Thede掣

8、．eeofweatIleringrelatestot11enumberofterraces．Usually'tllereisno、Ⅳeatheringforterr