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DOI | 10.1038/NGEO3011 |
Intermediate-depth earthquakes linked to localized heating in dunite and harzburgite | |
Ohuchi, Tomohiro1; Lei, Xinglin2; Ohfuji, Hiroaki1; Higo, Yuji3; Tange, Yoshinori3; Sakai, Takeshi1; Fujino, Kiyoshi1; Irifune, Tetsuo1,4 | |
2017-10-01 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:10 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | The occurrence of intermediate-depth and deep earthquakes at depths greater than 60 km in subducting slabs has long puzzled geoscientists. These earthquakes require some mechanism to accelerate the fault movement at high pressures above 1.8 GPa. Localized heating would contribute to faulting, but experimental evidence for this mechanism has been limited to pressures of up to 0.5 GPa. Here we conduct deformation experiments on dry dunite samples at pressures of 1.0 to 2.6 GPa and temperatures of 860 to 1,350 K-conditions close to those for relatively shallow intermediate-depth earthquakes. We observe plastic deformation of the dunite, followed by faulting and acoustic emissions at an accelerated strain rate of about 5 x 10(-5) s(-1) or higher. We find that ultrafine-grained gouge layers containing iron-rich melt films, which is indicative of a very high peak temperature of about 2,110 K along the fault planes. We also observe faulting in wet harzburgite-a dehydration product of antigorite-at natural stress levels of 0.3 to 0.4 gigapascals. We therefore suggest that intermediate-depth earthquakes can be induced by localized heating both in dry and wet subducting slabs, if the background strain rate exceeds a threshold value in the range from 10(-16) to 10(-13) s(-1). |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000412102200015 |
WOS关键词 | SHEAR LOCALIZATION ; PREFAILURE DAMAGE ; HIGH-TEMPERATURE ; UPPER-MANTLE ; GRAIN-SIZE ; PRESSURE ; OLIVINE ; DEFORMATION ; PSEUDOTACHYLYTES ; ELASTICITY |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35127 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Ehime Univ, Geodynam Res Ctr, Matsuyama, Ehime 7908577, Japan; 2.Natl Inst Adv Ind Sci & Technol, Geol Survey Japan, Tsukuba, Ibaraki 3058567, Japan; 3.Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795198, Japan; 4.Tokyo Inst Technol, Earth Life Sci Inst, Tokyo 1528550, Japan |
推荐引用方式 GB/T 7714 | Ohuchi, Tomohiro,Lei, Xinglin,Ohfuji, Hiroaki,et al. Intermediate-depth earthquakes linked to localized heating in dunite and harzburgite[J]. NATURE GEOSCIENCE,2017,10(10). |
APA | Ohuchi, Tomohiro.,Lei, Xinglin.,Ohfuji, Hiroaki.,Higo, Yuji.,Tange, Yoshinori.,...&Irifune, Tetsuo.(2017).Intermediate-depth earthquakes linked to localized heating in dunite and harzburgite.NATURE GEOSCIENCE,10(10). |
MLA | Ohuchi, Tomohiro,et al."Intermediate-depth earthquakes linked to localized heating in dunite and harzburgite".NATURE GEOSCIENCE 10.10(2017). |
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