| 断裂岩岩石磁学研究进展 |
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| 关键词:pseudotachylyte fault gouge rock magnetism seismic faulting |
| 基金项目:国家自然科学基金项目(编号: 41520104006; 41830217; 41330211; 41802223; 41602226);中国地质科学院基本科研业务费项目(编号: YYWF201601; JYYWF201831);中国博士后科学基金(编号: 2018M640163) |
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| 摘要: |
| A Review of Rock Magnetism for Fault Rocks |
| Rock magnetism of fault rocks reveals the physical and chemical characteristics of earthquake fault zone and contributes to the study of seismic faulting mechanism and active behavior. This paper reviews the rock magnetic studies of earthquake fault rocks, based on the newest literature and works related to rock magnetism as well as achievements from the Longmen Shan fault zone. Rock magnetic studies have revealed magnetic highs or lows in fault gouge or pseudotachylyte. The frictional heating high temperatures or fluids induced thermal decomposition of paramagnetic minerals, forming ferromagnetic minerals and contributing to the high magnetic susceptibility values or remanence of fault gouge or pseudotachylyte; pure iron in frictional melting is another important reason for high magnetic susceptibility values or remanence of pseudotachylyte. Some fault gouges in creep fault zone or surface fault zone have lower magnetic susceptibility values than wall rocks, and this might result from the fluid or low frictional heating temperature. Rock magnetism of fault rocks provides important information for stress, strain, temperature, frictional heating, fluid, formation depth and different redox characteristics of earthquake fault zone, which is helpful to analyzing the seismogenic environment. Combined with rock magnetic measurements, the microstructural studies in micron or nanometer and the strengthening of frictional experiments as well as high temperature heating experiments of fault rocks will lead to better obtaining the magnetic information of earthquake fault zone. |
| ZHANG Lei,LI Hai-bing,SUN Zhi-ming,CAO Yong.2019.A Review of Rock Magnetism for Fault Rocks[J].Acta Geoscientica Sinica,40(1):157-172. |
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