银川平原断裂体系划分与研究
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摘要
银川平原位于宁夏北部,夹持于贺兰山与灵盐台地之间。大地构造隶属于鄂尔多斯西缘冲断带,为一新生代断陷盆地(五级构造单元)。区域上,受阿拉善微陆块NE向的挤压及鄂尔多斯西缘EW向的拉张作用,银川盆地构造活动性较强烈,地震灾害威胁严重。针对第四系厚覆盖区断层难以定位及划分的难题,本研究在地质研究的基础上,综合运用多种边界识别技术,分析处理1∶20万区域重力数据,相互比对、印证,共划定断裂43条,确立了银川平原断裂体系,并针对黄河断裂、贺兰山东麓断裂等6条主要断裂进行了深入的分析,为银川平原断裂活动性研究奠定了坚实的基础。
The Yinchuan Plain is located in the northern of Ningxia,sandwiched between Helan Mountain and the Lingwu-Yanchi platform. Its tectonics is a Cenozoic rift basin( fifth-order tectonic unit),belonging to the western Ordos thrust belt. Regionally,the tectonic activity of Yinchuan Basin is strong and the threat of earthquake disaster is serious because of the NE-trending compression of Alxa micro-continent block and the EW-trending stretching of the western margin of Ordos. It is difficult to locate and divide faults in the thick overburden area of Quaternary. On the basis of geological research,by means of comprehensive application of several boundary recognition technology,deal with 1 ∶ 200,000 regional gravity data,compared and verified each other,delimited 43 faults and establishes Yinchuan Plain fault system in this study. Six major faults,such as the Yellow River fault and the Helan fault,were studied in depth,which layed a solid foundation for the study of fault activity in Yinchuan Plain.
The Yinchuan Plain is located in the northern of Ningxia,sandwiched between Helan Mountain and the Lingwu-Yanchi platform. Its tectonics is a Cenozoic rift basin( fifth-order tectonic unit),belonging to the western Ordos thrust belt. Regionally,the tectonic activity of Yinchuan Basin is strong and the threat of earthquake disaster is serious because of the NE-trending compression of Alxa micro-continent block and the EW-trending stretching of the western margin of Ordos. It is difficult to locate and divide faults in the thick overburden area of Quaternary. On the basis of geological research,by means of comprehensive application of several boundary recognition technology,deal with 1 ∶ 200,000 regional gravity data,compared and verified each other,delimited 43 faults and establishes Yinchuan Plain fault system in this study. Six major faults,such as the Yellow River fault and the Helan fault,were studied in depth,which layed a solid foundation for the study of fault activity in Yinchuan Plain.
引文
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[16]李晓亮,崔式涛,朱春岭,等.重力数据处理方法在LAMU盆地L2区块划分断裂的应用[J].辽宁化工,2011,40(3):278-280,295.
[17]刘银萍,王祝文,杜晓娟,等.边界识别技术及其在虎林盆地中的应用[J].吉林大学学报(地球科学版),2012,42(增刊3):271-278.
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[21]王美芳,李慧勤.宁夏银川盆地地质构造演化特征[J].科技资讯,2008(3):148-149.
[2]柴炽章,孟广魁,马贵仁,等.银川市活动断层探测与地震危险性评价[M].北京:科学出版社,2011.
[3]刘保金,柴炽章,酆少英,等.第四纪沉积区断层及其上断点探测的地震方法技术:以银川隐伏活动断层为例[J].地球物理学报,2008,51(5):1475-1483.
[4]王鑫,詹艳,赵国泽,等.鄂尔多斯盆地西缘构造带北段深部电性结构[J].地球物理学报,2010,53(3):595-604.
[5]汪琪,赵志鹏,尹秉喜,等.电磁测深MT法在平原深部地热调查中的应用[J].工程地球物理学报,2016,13(6):782-787.
[6]李燕,刘保金,酆少英,等.利用地震折射和反射波资料研究银川盆地浅部结构和隐伏断裂[J].地球物理学报,2017,60(8):3096-3109.
[7]白亚东,李宁生,虎新军,等.利用1∶20万区域重力资料研究宁夏断裂体系[J].工程地球物理学报,2018,15(3):330-337.
[8]邓起东,程绍平,闵伟,等.鄂尔多斯块体新生代构造活动和动力学的讨论[J].地质力学学报,1999,5(3):13-21.
[9]白铭学,焦德成. 1739年银川—平罗8级地震灾害的历史辨析[J].西北地震学报,2005,27(2):135-140.
[10]方盛明,赵成彬,柴炽章,等.银川断陷盆地地壳结构与构造的地震学证据[J].地球物理学报,2009,52(7):1768-1775.
[11]酆少英,高锐,龙长兴,等.银川地堑地壳挤压应力场:深地震反射剖面[J].地球物理学报,2011,54(3):692-697.
[12]雷启云,柴炽章,杜鹏,等. 1739年平罗8级地震发震构造[J].地震地质,2015,37(2):413-429.
[13]张岳桥,廖昌珍,施炜,等.鄂尔多斯盆地周边地带新构造演化及其区域动力学背景[J].高校地质学报,2006,12(3):285-297.
[14]赵红格,刘池洋,王锋,等.贺兰山隆升时限及其演化[J].中国科学:D辑地球科学,2007,37(增刊1):185-192.
[15]黄兴富,施炜,李恒强,等.银川盆地新生代构造演化:来自银川盆地主边界断裂运动学的约束[J].地学前缘,2013,20(4):199-210.
[16]李晓亮,崔式涛,朱春岭,等.重力数据处理方法在LAMU盆地L2区块划分断裂的应用[J].辽宁化工,2011,40(3):278-280,295.
[17]刘银萍,王祝文,杜晓娟,等.边界识别技术及其在虎林盆地中的应用[J].吉林大学学报(地球科学版),2012,42(增刊3):271-278.
[18]胡清森,明彦伯,姚刚.重磁数据在东海陆架盆地构造格架划分中的应用[J].世界地质,2018,37(2):579-584.
[19]徐占海,李捍国,宋新华,等.中国区域地质志/宁夏志[M].北京:地质出版社,2017.
[20]李宁生,冯志民,朱秦,等.宁夏区域重磁资料开发利用研究[M].北京:地质出版社,2016.
[21]王美芳,李慧勤.宁夏银川盆地地质构造演化特征[J].科技资讯,2008(3):148-149.