DOI: 10.1038/s41561-017-0010-7
论文题名: Fossil intermediate-depth earthquakes in subducting slabs linked to differential stress release
作者: Scambelluri M. ; Pennacchioni G. ; Gilio M. ; Bestmann M. ; Plümper O. ; Nestola F.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 12 起始页码: 960
结束页码: 966
语种: 英语
Scopus关键词: coseismic process
; ductile deformation
; earthquake
; fault
; fault slip
; faulting
; gabbro
; mantle
; ophiolite
; peridotite
; seismic property
; slab
; stress
; subduction zone
; Alps
; Italy
英文摘要: The cause of intermediate-depth (50-300 km) seismicity in subduction zones is uncertain. It is typically attributed either to rock embrittlement associated with fluid pressurization, or to thermal runaway instabilities. Here we document glassy pseudotachylyte fault rocks - the products of frictional melting during coseismic faulting - in the Lanzo Massif ophiolite in the Italian Western Alps. These pseudotachylytes formed at subduction-zone depths of 60-70 km in poorly hydrated to dry oceanic gabbro and mantle peridotite. This rock suite is a fossil analogue to an oceanic lithospheric mantle that undergoes present-day subduction. The pseudotachylytes locally preserve high-pressure minerals that indicate an intermediate-depth seismic environment. These pseudotachylytes are important because they are hosted in a near-anhydrous lithosphere free of coeval ductile deformation, which excludes an origin by dehydration embrittlement or thermal runaway processes. Instead, our observations indicate that seismicity in cold subducting slabs can be explained by the release of differential stresses accumulated in strong dry metastable rocks. © 2017 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105661
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Dipartimento di Scienze della Terra, Ambiente e Vita, University of Genova, Genoa, Italy; Dipartimento di Geoscienze, University of Padova, Padua, Italy; Dipartimento di Scienze della Terra e dell'Ambiente, University of Pavia, Pavia, Italy; GeoZentrum Nordbayern, Friedrich-Alexander University of Erlangen-Nürnberg, Erlangen, Germany; Department of Earth Sciences, Utrecht University, Utrecht, Netherlands
Recommended Citation:
Scambelluri M.,Pennacchioni G.,Gilio M.,et al. Fossil intermediate-depth earthquakes in subducting slabs linked to differential stress release[J]. Nature Geoscience,2017-01-01,10(12)