Brittle and semi-brittle fractures of antigorite serpentinite in triaxial compression
文献类型：期刊论文
| 作者 | Shao TongBin1; Song MaoShuang1; Li JianFeng1; Zhang GuiNan1,2; Xia Ying1,2 |
| 刊名 | Acta petrologica sinica
 |
| 出版日期 | 2016-06-01 |
| 卷号 | 32期号:6页码:1675-1687 |
| 关键词 | Antigorite Triaxial compression Brittle and semi-brittle Dehydration embrittlement Intermediate-depth earthquakes Subduction zones |
| ISSN号 | 1000-0569 |
| 通讯作者 | Shao tongbin(stb558069@126.com) |
| 英文摘要 | Deformation experiments on antigorite serpentinites at confining pressures of 100 similar to 400mpa, temperatures of 25 similar to 700 degrees c, and strain rates of 10(-5) similar to 1. 5 x 10(-6)s(-1) indicate that semi-brittle and brittle fractures take place, respectively, at high pressures (or/and dehydration conditions) and low pressures. gradual and dramatic decreases in strength of samples are observed in the absence and presence of dehydration, respectively, with the increase of temperature. the preheating time has a more important effect on the strength under high temperatures (e.g., 600 degrees c) where antigorite may dehydrate during the experiment than under low temperatures (e.g., 550 degrees c) which are too low to enable dehydration in our laboratory experiments. combined and compared with previous studies, we found that increasing confining pressure leads to increase in the strength at room temperature but to the overall trend of decreasing strength in the presence of dehydration, probably due to the partial loss of cohesive strength and the increase of ductility. the ductility of fault surface can increase with temperature, confining pressure, and fluid content on fault surface increasing, resulting in friction coefficient decreasing. antigoiite, which is not yielded even after differential stress exceeded ca. 600mpa at high temperatures (ca. 600 degrees c) and ca. 1000mpa at low-moderate temperatures (<= 400 degrees c), has a strength much stronger than that of low temperature serpentines (e.g., lizardite and chrysotile). surprisingly, dehydration embrittlement, a classic hypothesis proposed for generating intermediate-depth earthquakes, is not observed for dehydrating antigorite in our laboratory. dehydration of antigorite in subduction zones may therefore induce seismogenic failure in the brittle wall rocks rather than in the dehydrating serpentinite itself. |
| WOS关键词 | FORE-ARC MANTLE ; SUBDUCTION ZONES ; TECTONIC IMPLICATIONS ; FRICTIONAL STRENGTH ; FLUID-PRESSURE ; FAULT GOUGE ; DEHYDRATION ; DEFORMATION ; WEDGE ; WATER |
| WOS研究方向 | Geology |
| WOS类目 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000379796600008 |
| 出版者 | SCIENCE PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2374593 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Shao TongBin |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shao TongBin,Song MaoShuang,Li JianFeng,et al. Brittle and semi-brittle fractures of antigorite serpentinite in triaxial compression[J]. Acta petrologica sinica,2016,32(6):1675-1687. |
| APA | Shao TongBin,Song MaoShuang,Li JianFeng,Zhang GuiNan,&Xia Ying.(2016).Brittle and semi-brittle fractures of antigorite serpentinite in triaxial compression.Acta petrologica sinica,32(6),1675-1687. |
| MLA | Shao TongBin,et al."Brittle and semi-brittle fractures of antigorite serpentinite in triaxial compression".Acta petrologica sinica 32.6(2016):1675-1687. |
入库方式： iSwitch采集
来源：中国科学院大学
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。