陕南汉中盆地西部梁山南缘断裂隐伏段的活动性鉴定
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摘要
汉中盆地是青藏高原、秦岭与大巴山—龙门山差异隆升区中间的新生代断陷盆地,是重要的地质体连结点.通过新近开展的汉中市活断层探测工作中的地面地质调查、浅层地震勘探与钻孔联合地质剖面分析等工作认为,汉中盆地内部存在一条活动断裂,即梁山南缘断裂.浅层地震勘探资料显示,梁山南缘断裂错断多套第四纪以来的地层,错距自下而上逐渐减小.钻孔联合地质剖面显示,梁山南缘断裂错断晚更新世中晚期以来的砾砂及卵石层,距今58ka的砾砂层错距约为6m.这些现象首次揭示了汉中盆地内部梁山南缘断裂的最新活动时代和活动性质.
Hanzhong basin is a Cenozoic faulted basin located in the differential uplift region among Qinghai--Xizang plateau,Qinling mountain and Dabashan--Longmenshan.It is a connection hub among them.Based on the analysis of ground geological survey,shallow seismic prospecting and composite drilling geologic profile carried out recently in active fault surveying of Hanzhong,we recognized that there is an active fault in Hanzhong basin,namely the Liang shan south margin fault.Shallow seismic investigation data indicate that this fault cuts many sets of Quaternary strata in Hanzhong city and the offsets are reduced gradually from bottom up.Composite drilling geologic profiles show that this fault breaks sand and gravel strata of the middle and late period of Late Pleistocene.The offset is about six meters.These phenomena show the latest activity age and nature of the Liangshan south margin fault in Hanzhong for the first time.
Hanzhong basin is a Cenozoic faulted basin located in the differential uplift region among Qinghai--Xizang plateau,Qinling mountain and Dabashan--Longmenshan.It is a connection hub among them.Based on the analysis of ground geological survey,shallow seismic prospecting and composite drilling geologic profile carried out recently in active fault surveying of Hanzhong,we recognized that there is an active fault in Hanzhong basin,namely the Liang shan south margin fault.Shallow seismic investigation data indicate that this fault cuts many sets of Quaternary strata in Hanzhong city and the offsets are reduced gradually from bottom up.Composite drilling geologic profiles show that this fault breaks sand and gravel strata of the middle and late period of Late Pleistocene.The offset is about six meters.These phenomena show the latest activity age and nature of the Liangshan south margin fault in Hanzhong for the first time.
引文
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方盛明,张先康,刘保金,徐锡伟,白登海,姬继法.2002.探测大城市活断层的地球物理方法[J].地震地质,24(4):606--613.
何仲太,马保起,卢海峰,王金燕.2009.北京东北旺—小汤山断裂存在的证据[J].地震地质,31(2):233--246.
江娃利.2001.北京平原夏垫断裂潘各庄钻孔晚更新世晚期以来古地震事件分析[M]∥中国地震局地质研究所编.活动断裂研究(8).北京:地震出版社:140--148.
潘纪顺,刘保金,朱金芳,方盛明,王夫运,段永红,张红强.2003.城市活断层的抗干扰高分辨率浅层地震勘探研究[J].中国地震,19(2):148--157.
徐锡伟,计凤桔,于贵华,陈文彬,王峰,江娃利.2000.用钻孔地层剖面记录恢复古地震序列:河北夏垫断裂古地震研究[J].地震地质,22(1):9--19.
徐锡伟,闻学泽,叶建青,马宝起,陈杰,周荣军,何宏林,田勤俭,何玉林,王志才,孙绍民,冯希杰,于贵华,陈立春,陈桂华,于慎鄂,冉永康,李细光,李陈侠,安艳芬.2008.汶川MS8.0地震地表破裂带及其发震构造[J].地震地质,30(3):597--629.
杨晓平,郑荣章,张兰凤.2007.浅层地震勘探资料地质解释过程中值得重视的问题[J].地震地质,29(2):282--293.
杨晓平,袁洪克,宋新初,王里,刘保金,叶建青,陈献程,周本刚.2011.浙江宁波育王山山前隐伏断层勘探和新活动时代[J].地球科学,36(6):967--976.
张春生,刘春,石军,张宪.2004.汉中与安康盆地地震活动特征[J].华北地震科学,22(2):18--23.
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