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@ARTICLE{Stnitz:837911,
author = {Stünitz, H. and Thust, A. and Heilbronner, R. and Behrens,
H. and Kilian, R. and Tarantola, A. and Fitz Gerald, J. D.},
title = {{W}ater redistribution in experimentally deformed natural
milky quartz single crystals-{I}mplications for {H} 2
{O}-weakening processes},
journal = {Journal of geophysical research / Solid earth},
volume = {122},
number = {2},
issn = {2169-9313},
address = {Hoboken, NJ},
publisher = {Wiley},
reportid = {FZJ-2017-06681},
pages = {866 - 894},
year = {2017},
abstract = {Natural quartz single crystals were experimentally deformed
in two orientations: (1) ⊥ to one prism plane and (2) in
O+ orientation at 900 and 1000°C, 1.0 and 1.5 GPa, and
strain rates of ~1 × 10−6 s−1. In addition,
hydrostatic and annealing experiments were performed. The
starting material was milky quartz, which consisted of dry
quartz with a large number of fluid inclusions of variable
size up to several 100 µm. During pressurization fluid
inclusions decrepitated producing much smaller fluid
inclusions. Deformation on the sample scale is anisotropic
due to dislocation glide on selected slip systems and
inhomogeneous due to an inhomogeneous distribution of fluid
inclusions. Dislocation glide is accompanied by minor
dynamic recovery. Strongly deformed regions show a pointed
broad absorption band in the ~3400 cm−1 region
consisting of a superposition of bands of molecular H2O and
three discrete absorption bands (at 3367, 3400, and
3434 cm−1). In addition, there is a discrete absorption
band at 3585 cm−1, which only occurs in deformed regions
and reduces or disappears after annealing, so that this band
appears to be associated with dislocations. H2O weakening in
inclusion-bearing natural quartz crystals is assigned to the
H2O-assisted dislocation generation and multiplication.
Processes in these crystals represent recycling of H2O
between fluid inclusions, cracking and crack healing,
incorporation of structurally bound H in dislocations,
release of H2O from dislocations during recovery, and
dislocation generation at very small fluid inclusions. The
H2O weakening by this process is of disequilibrium nature
because it depends on the amount of H2O available.},
cin = {ER-C-1},
ddc = {550},
cid = {I:(DE-Juel1)ER-C-1-20170209},
pnm = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
pid = {G:(DE-HGF)POF3-143},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000396132200007},
doi = {10.1002/2016JB013533},
url = {https://juser.fz-juelich.de/record/837911},
}