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Neotectonic activity and formation mechanism of the Yishu Fault Zone 被引量:18

Neotectonic activity and formation mechanism of the Yishu Fault Zone
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摘要 On the basis of comprehensive analyses of fault textures and geometry,the active methods,stress field,mechanism and time of the Yishu Fault Zone during the neotectonic period are discussed in this paper.The results show that the Yishu Fault Zone is a major mobile belt since the Quaternary.It consists of four major active faults with reverse dextral slip.Their active intensity increases eastwards and southwards.Fault-slip data from many active faults in the fault zone demonstrate that ENE-WSW compression predominated in the neotectonic period.Detailed field investigation shows that formation mechanism of shallow,active faults in the Yishu Fault Zone includes direct boundary fault reactivity,buried fault propagation,and reactivity of antithetic and truncating faults.In most cases,shallow,active faults in the fault zone are developed through direct reactivity or upward propagation of the previous four graben boundary faults. On the basis of comprehensive analyses of fault textures and geometry, the active methods, stress field, mechanism and time of the Yishu Fault Zone during the neotectonic period are discussed in this paper. The results show that the Yishu Fault Zone is a major mobile belt since the Quaternary. It consists of four major active faults with reverse dextral slip. Their active intensity increases eastwards and southwards. Fault-slip data from many active faults in the fault zone demonstrate that ENE-WSW compression predominated in the neotectonic period. Detailed field investigation shows that formation mechanism of shallow, active faults in the Yishu Fault Zone includes direct boundary fault reactivity, buried fault propagation, and reactivity of anti- thetic and truncating faults. In most cases, shallow, active faults in the fault zone are developed through direct reactivity or upward propagation of the previous four graben boundary faults.
出处 《Science China Earth Sciences》 SCIE EI CAS 2014年第4期614-629,共16页 中国科学(地球科学英文版)
基金 supported by National Natural Science Foundation of China(Grant No.91214301) Geological Survey of China(Grant No.1212011120104)
关键词 Yishu Fault Zone active fault structural features stress field formation mechanism 沂沭断裂带 新构造活动 机制 直接反应 新构造期 活动断层 活动断裂 几何形状
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