成都盆地南缘第四纪构造变形及地貌响应特征-论文.pdf

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1、第36卷第1期地震工程学报Vo1．36No．12014年3月CHINAEARTHQUAKEENGINEERINGJOURNALMarch，2014成都盆地南缘第四纪构造变形及地貌响应特征①梁明剑，李大虎，郭红梅，王世元(四JII省地震局，四川I成都610041)摘要：通过卫星影像解译、野外实地调查与数字地形分析，研究了成都盆地南缘构造变形特征及与地貌的响应关系，重点为邛西构造和熊坡背斜的晚第四纪构造变形。结果表明：中更新世是成都盆地南缘地区一个较重要的构造变形阶段，邛西构造与熊坡背斜的发育与演化也主要集中在这一阶段，并导

2、致了古青衣江数次改道，遗留下规模巨大的冲洪积扇——名邛台地。熊坡背斜亚流域盆地的面积一高程积分值(HI值)自SW向NE总体呈逐渐减小的趋势，反映了熊坡背斜主要受到来自南部的动力作用，并呈现自SW向NE扩展变形的过程，显示成都盆地南缘地区流域地貌对其构造变形存在着明显的反馈作用。关键词：成都盆地南缘；第四纪构造变形；邛西构造；熊坡背斜；地貌响应中图分类号：P546文献标志码：A文章编号：1000-0844(2014)01-0098-09DOI：10．3969／j．issn．1000—0844．2014．01．0098Qua

3、ternaryTectonicDeformationandGeomorphologicResponseCharacteristicsintheSouthernMarginofChengduBasinLIANGMing—jian，LIDa—hu，GUOHong—mei，WANGShi—yuan(EarthquakeAdministrationofSichuanProvince，Chengdu，Sichuan610041，China)Abstract：ChengduBasinislocatedinthefrontofLong

4、menshanMountain。1imitedbetweentheLongmenshanMountainandXiongpoanticline．ThetwomajortectonicsystemsinthesOUthernmarginofChengduBasinaretheQiongxithrustfaultsystemandXiongpoanticline．TheDatangandthePujiang—XinjinaretherespectivemajorfaultswithQiongxithrustfaultsyst

5、emandXiong—poanticline．Thelandscapedevelopmentofthedrainages，suchasLinxiRiverandQingyiRiver，mayhaveafeedbackeffectontheLateQuaternarydeformationofthetectonicsystems．There-sponserelationshipbetweentectonicdeformationcharacteristicandlandscapeintheSOuthernmarginofC

6、hengduBasinwasstudiedinthispaperbyinterpretingsatelliteimages，conductingfieldgeologicalinvestigations，andDigitalTerrainAnalysis．Thelatequaternarvtectonicdeforma—tioncharacteristicofQiongxithrustfaultandXiongpoanticlinewereemphaticallystudiedinthispaper．Ouranalysi

7、sindicatesthatthemiddlePleistocenewasanimportantperiodoftectonicde—formationinthesouthernmarginofChengduBasin．Throughfieldinvestigation，wefoundthatDatangfaultisthewestreversefaultoftheQiongxithrustfaultsystemandrecentactivitya1ongtheDatangresultedinthetectonicdef

8、ormationofMing—Qiongplatform．Pujiang—XinjinfaultalsodislocatedtheYaangravellayer，whichwasformedinmiddlePleistocene．SothemaindeveloD—mentandevolutionoftheQiongx