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世界地质 2021, 40(4) 945-954 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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基础地质 |
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汉中盆地阶地特征及其对构造活动响应初步分析 |
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赵超1 ,田辉1 ,韩朝辉1 ,朱一龙1 ,龚文强1 ,王锡魁2 |
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1中国地质调查局 西安矿产资源调查中心,西安 710100;
2吉林大学 地球科学学院,长春 13006 |
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摘要:
通过野外调查,查明汉中盆地阶地特征,并结合前人地质地貌及测年研究成果对汉中盆地的形成年龄进行了推断及其对构造活动响应进行初步分析。结果表明,汉中盆地可被划分为Ⅰ ~Ⅳ级阶地,其中Ⅰ ~Ⅲ级阶地为堆积阶地,Ⅳ级阶地为基座阶地。汉江北岸阶地宽阔而南岸狭窄,地貌面具有向南倾斜的特征,致使汉江不断向南迁移。汉江Ⅰ ~Ⅳ级阶地形成时代分别为全新世—晚更新世后期、晚更新世、晚更新世早期—中更新世、中更新世—早更新世。综合分析表明,更新世以来秦岭至少有过 4次的隆升活动,中晚更新世秦岭隆升幅度较大,晚更新世以来秦岭的隆升幅度相对较小,汉中盆地的抬升速率波动式上升,但抬升速率均较秦岭小,可能是由于汉中盆并非秦岭隆升的核心区域。 |
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关键词:
汉中盆地
阶地
构造响应
秦岭隆升
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Characteristics of Hanzhong Basin terraces and its initial response to tectonic activity |
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ZHAOChao1 ,TIANHui1 ,HANChaohui1 ,ZHUYilong1 ,GONGWenqiang1 ,WANGXikui2 |
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1.XianMineralResourcesSurveyCenter,ChinaGeologicalSurvey,Xian710100,China;
2.CollegeofEarthSciences,JilinUniversity,Changchun130061,Chin |
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Abstract:
Inthisstudy,theterracecharacteristicsofHanzhongBasinwasidentifiedbyfieldinvestigation,theformationageofHanzhongBasinwasdeducedandtheresponsetotectonicactivitywasanalyzedcombiningwith thepreviousresearchondatingandgeologicalgeomorphologyofHanjiangRiver.TheresultsshowHanzhongBasin wasdividedintoⅠ ~Ⅳ terraces,inwhichtheⅠ ~Ⅲ terracesareaccumulationterracesandtheⅣ terraceisa baseterrace.Besides,theterracesonthenorthbankofHanjiangRiverarewide,butnarrowonthesouthbank,withthegeomorphologicalsurfacecharacteristicsofincliningtothesouth,resultinginthecontinuoussouthwardmigrationofHanjiangRiver.Additionally,theformationagesofHanjiangRiverⅠ ~Ⅳ terraceswerededucedinto HoloceneLatePleistocene,LatePleistocene,EarlyLatePleistoceneMiddlePleistoceneandMiddlePleistoceneEarlyPleistocene.Intheconclusion,atleastfourupliftingactivitieswerepresentedsincethePleistoceneinQinling,ofwhich,theupliftingamplitudewasrelativelyobviousintheMiddleLatePleistoceneandrelativelytiny sincethelatePleistoceneinQinling.TheupliftrateofHanzhongBasinwasincreasedinafluctuatingtendency,but weakerthanthatofQinling,whichisprobablybecauseHanzhongBasinisnotthecoreupliftingareaofQinling |
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Keywords:
HanzhongBasin
terrace
tectonicresponse
upliftofQinlingMountains
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本刊中的类似文章 |
1.王欢, 徐华, 王锡魁.小兴安岭与松辽盆地新生代耦合关系[J]. 世界地质, 2018,37(3): 804-812,825 |
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