龙门山推覆构造带中段山前断裂晚第四纪活动的地质与地球物理证据.pdf

龙门山推覆构造带中段山前断裂晚第四纪活动的地质与地球物理证据.pdf556 地球物理学报琋
20126 CHINESE JOURNAlOF Jun2012
任俊杰,徐锡伟,,,
(6)1929941doi106038jissn000l5733201206014
Ren J JXuX 琒 X Zet. and geophysical evidences the range front fault
along the 猻 the Longmen ..,。琩:.
6038jissn0001-5733201206014
龙门山推覆构造带中段山前断裂晚第四纪活动的
地质与地球物理证据
任俊杰,徐锡伟卜,孙鑫苗肺,李 113
1100029
2()
3450002

浅层地震剖面揭示该断裂的存在,并断错了第四系;野外调查表明,龙门山中段山前存在明显的线性地貌特征,山
前断裂断错晚了更新世晚期的洪积台地;探槽剖面揭示距今约 a
GPS
036mma
,也有助于全面理解青
藏高原东缘的隆升机制.
关键词龙门山中段,山前断裂,断错地貌,探槽,青藏高原东缘
doi106038jissn00015733201206014中图分类号 2011-0718201lll09
and geophysical evidences the range-front
fault along the mid-segment the Longmen
REN JunJielXU—保琒猌—,
Kan91KANGWen-JunlLIU
1 NationalCenterforActive Fault 琁珻,瓹
2 Key 珻 DynamicsInstitute Crustal DynamicsChina Admim'strationBeijing100085China
3 ‘ AdministrationZhengzhou450002China
The existence and the the fault along the mid-segment
the Longmen belts are controversial for a periodPetroleumseismic
and —’ shallow seismic profile the existence the 猣
fault which the strataBased field observationwefound there
obvious feature along the mid-segment the Longmen front and the range-front
基金项目国家自然科学基金、椭泄卣鹁值乜怯αρ芯克醒爰豆嫘钥蒲性核究蒲幸滴褡ㄏ
+
作者简介任俊杰,、构造地貌与地震危险性分析等方面的研究.
******@gmailCOrll
..
地球物理学报 JGeophys) 卷
fault displaced the terraceTrenchlog indicates a surface
rupture event ~ a along the 猣 faultDifferentialGPS surveying
and terrace the range-front had a
036/琣 along the the
Longmen 畐 the 猣 important
modating the deformation the Longmen . study not
the 【 for seismic the Chengdu 琤 helpful
for the overall understanding mechanism Tibet
猻 the Longmenshan ,猣現,
TrenehEastern bet
前断裂与龙门山主断裂具有相似的深部构造背景.
l 引言但这些观点主要基于地球物理资料解译和沉积地层
分析,缺少野外地质调查和高分辨率的浅层地震勘
龙门山逆冲推覆构造带位于四川盆地西缘,是探证据.
青藏高原与华南地块的边界构造带,也是青藏高原年汶川级