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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Commun
2017 ; 8
(ä): 15247
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Dehydration-driven stress transfer triggers intermediate-depth earthquakes
#MMPMID28504263
Ferrand TP
; Hilairet N
; Incel S
; Deldicque D
; Labrousse L
; Gasc J
; Renner J
; Wang Y
; Green Ii HW
; Schubnel A
Nat Commun
2017[May]; 8
(ä): 15247
PMID28504263
show ga
Intermediate-depth earthquakes (30-300?km) have been extensively documented
within subducting oceanic slabs, but their mechanics remains enigmatic. Here we
decipher the mechanism of these earthquakes by performing deformation experiments
on dehydrating serpentinized peridotites (synthetic antigorite-olivine
aggregates, minerals representative of subduction zones lithologies) at upper
mantle conditions. At a pressure of 1.1 gigapascals, dehydration of deforming
samples containing only 5?vol% of antigorite suffices to trigger acoustic
emissions, a laboratory-scale analogue of earthquakes. At 3.5 gigapascals,
acoustic emissions are recorded from samples with up to 50?vol% of antigorite.
Experimentally produced faults, observed post-mortem, are sealed by fluid-bearing
micro-pseudotachylytes. Microstructural observations demonstrate that antigorite
dehydration triggered dynamic shear failure of the olivine load-bearing network.
These laboratory analogues of intermediate-depth earthquakes demonstrate that
little dehydration is required to trigger embrittlement. We propose an
alternative model to dehydration-embrittlement in which dehydration-driven stress
transfer, rather than fluid overpressure, causes embrittlement.