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\begin{document}

\title{Non-dilatant brittle deformation and strength weakening of olivine
gabbro due to hydration}



\author[1]{Yuya Akamatsu}%
\author[1]{Kumpei Nagase}%
\author[1]{Ikuo Katayama}%
\affil[1]{Hiroshima University}%


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  \date{May 28, 2024}


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\begin{abstract}
To investigate the influence of hydration on brittle deformation of
oceanic crustal rocks, we conducted triaxial deformation experiments on
gabbroic rocks with various degrees of hydration. Additional experiments
were performed on samples of serpentinite and serpentinized peridotite
for comparison. Elastic wave velocities were measured during deformation
to monitor the development of stress-induced cracks.\\
Hydrated olivine gabbros reached a maximum differential stress of
225--350 MPa, which was considerably less than that recorded for gabbros
(\textasciitilde{}450 MPa), but comparable to those for serpentinized
ultramafic rocks (250--300 MPa). Elastic wave velocities of hydrated
olivine gabbros were almost constant during deformation and did not show
a marked decrease, even immediately prior to failure. This indicated
that the deformation of hydrated olivine gabbro is not associated with
the opening of the stress-induced axial cracks that are responsible for
dilatancy and are commonly observed during deformation of crystalline
rocks. Microstructural observations of the samples recovered after
deformation showed crack damage to be highly localized to shear fracture
zones with no trace of stress-induced crack opening, consistent with the
absence of dilatancy. These data suggest that brittle deformation of
hydrated olivine gabbro can be accommodated by the development of shear
cracks in hydration minerals such as serpentine and chlorite, even when
they are present in only small amounts. This leads to non-dilatant
brittle deformation and a weakening of fracture strength, similar to
that observed during deformation of serpentinized peridotite. Our
results suggest that the brittle behavior of the oceanic crust may
change considerably due to hydration.%
\end{abstract}%



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