Effect of pressure on the deformation of quartz aggregates in the presence of H2O
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F21%3A10435415" target="_blank" >RIV/00216208:11310/21:10435415 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=V7fXmNGyO0" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=V7fXmNGyO0</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jsg.2021.104351" target="_blank" >10.1016/j.jsg.2021.104351</a>
Alternative languages
Result language
angličtina
Original language name
Effect of pressure on the deformation of quartz aggregates in the presence of H2O
Original language description
Quartzite samples of high purity with a grain size of similar to 200 mu m have been experimentally deformed by coaxial shortening in a solid medium apparatus at 900 degrees C and at confining pressures ranging from 0.6 to 2 GPa. Most samples have been shortened by similar to 30% with 0.1 wt% added H2O. The samples deformed dominantly by crystal plasticity (dislocation creep), and there is a systematic decrease of flow stress with increasing confining pressure. Strain rate stepping tests yield stress exponents of n approximate to 1.4. The strain determined from individual grain shapes matches that determined from bulk shortening. In addition to plastic strain, mode I cracks developed in all samples, principally in the grain boundary regions. Recrystallized material, visible through cathodoluminescence colours, forms by two mechanisms: (1) progressive subgrain rotation and (2) cracking, nucleating small new grains. After high-angle boundaries have been established, grain boundary migration takes place, and a distinction of new grains nucleation origin (subgrain rotation or cracking) is impossible. At higher pressure, there is more recrystallized material forming in the deformed samples, and it is inferred that the inverse pressure dependence of flow stress is caused by enhanced grain boundary migration at higher pressure, consistent with previous studies.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Structural Geology
ISSN
0191-8141
e-ISSN
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Volume of the periodical
148
Issue of the periodical within the volume
July
Country of publishing house
GB - UNITED KINGDOM
Number of pages
17
Pages from-to
104351
UT code for WoS article
000663777800001
EID of the result in the Scopus database
2-s2.0-85105009695