Publication Date:
2021-03-29
Description:
Quartz microstructures produced in
short-term deformation and annealing
experiments are compared with those in
naturally deformed vein quartz in cores
from the Long Valley Exploratory Well
(Long Valley Caldera, California). The
experiments are designed to simulate
i) co-seismic deformation of quartz in
the uppermost plastosphere and
ii) annealing during post-seismic
stress relaxation.
The experiments are performed in a
modified Griggs type solid medium apparatus.
Natural polycrystalline quartz
samples (grain size on the order of millimetres)
are deformed at a temperature
of 400°C, a confining pressure of 2GPa,
and strain rates of ca. 10−4 s−1. The
differential stress reaches 2–4GPa and
the irreversible axial shortening is typically
a few percent. In some experiments
the samples have subsequently
been annealed for ca. 14–15 h at elevated
temperatures of 800–1000°C and
low stresses (quasi-hydrostatic or nonhydrostatic
conditions)...
Description:
conference
Keywords:
551
;
VKA 200
;
VAE 120
;
VAE 140
;
VHB 400
;
VKA 120
;
VGF 300
;
Gefügekunde der Gesteine
;
Methodik {Strukturgeologie}
;
Gesteinsdeformation {Strukturgeologie}
;
Oxide und Hydroxide {Mineralogie}
;
Experimentelle Petrologie
;
Experimentelle Mineralogie
;
Quarz
;
Deformation 〈Geologie〉
;
Experiment
;
Mikrostruktur
;
Rekristallisationstextur
Language:
German
Type:
anthologyArticle
,
publishedVersion
Format:
application/pdf
