ACTIVITY CHARACTERISTICS OF LUHUATAI BURIED FAULT SINCE LATE QUATERNARY REVEALED BY DRILLING

doi:10.3969/j.issn.0253-4967.2011.03.010

Abstract

Abstract:

Luhuatai Fault is one of the important buried tectonics in Yinchuan Basin.Based on the results of shallow seismic exploration,we conducted composite drilling section exploration and dating of the samples of borehole.Some useful data of the fault were obtained,such as the depth of upper breaking point,the latest activity age,displacement in late Quaternary,and slip rates,etc.This study shows that the activity is different between the north and south segment along Luhuatai Fault.The north segment is a Holocene fault,while the south segment is a late mid-Pleistocene fault. From north to south along the north segment of Luhuatai Fault,the activity has enhanced,and the faulting is stronger in late Pleistocene than Holocene.

Key words: buried active fault, composite drilling section, key horizon, slip rate

摘要：

芦花台断层是银川盆地内一条重要的隐伏构造。在浅层地震勘探成果的基础上,开展了钻孔联合剖面探测和钻孔样品测试,获得了断层上断点埋深、最新活动时代、晚第四纪累计位移和滑动速率等数据。结果表明: 芦花台隐伏断层北段和南段的活动性不同,南段为中更新世末活动断层,北段为全新世活动断层; 在北段内,断层活动强度在空间上表现为由北向南增强,在时间上表现为晚更新世活动强于全新世。

关键词: 隐伏活断层, 钻孔联合剖面, 滑动速率

CLC Number:

P315.2

LEI Qi-yun, CHAI Chi-zhang, DU Peng, WANG Yin, MENG Guang-kui. ACTIVITY CHARACTERISTICS OF LUHUATAI BURIED FAULT SINCE LATE QUATERNARY REVEALED BY DRILLING[J]. SEISMOLOGY AND GEOLOGY, 2011, 33(3): 602-614.

雷启云, 柴炽章, 杜鹏, 王银, 孟广魁. 基于钻探的芦花台隐伏断层晚第四纪活动特征[J]. 地震地质, 2011, 33(3): 602-614.

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