Fossil intermediate-depth earthquakes in subducting slabs linked to differential stress release

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Scambelluri M, Pennacchioni G, Gilio M, Bestmann M, Plumper O, Nestola F
Zeitschrift: Nature Geoscience
Verlag: NATURE PUBLISHING GROUP
Jahr der Veröffentlichung: 2017
Band: 10
Heftnummer: 12
Seitenbereich: 960-+
ISSN: 1752-0894


Abstract

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.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Bestmann, Michel Dr.
Professur für Tektonik


Einrichtungen weiterer Autorinnen und Autoren

Universiteit Utrecht (UU) / Utrecht University
University of Genova / Università degli Studi di Genova
University of Padua / Universita degli Studi di Padova


Zitierweisen

APA:
Scambelluri, M., Pennacchioni, G., Gilio, M., Bestmann, M., Plumper, O., & Nestola, F. (2017). Fossil intermediate-depth earthquakes in subducting slabs linked to differential stress release. Nature Geoscience, 10(12), 960-+. https://dx.doi.org/10.1038/s41561-017-0010-7

MLA:
Scambelluri, Marco, et al. "Fossil intermediate-depth earthquakes in subducting slabs linked to differential stress release." Nature Geoscience 10.12 (2017): 960-+.

BibTeX: 

Zuletzt aktualisiert 2018-22-07 um 23:11