High-temperature fracturing and subsequent grain-size-sensitive creep in lower crustal gabbros: Evidence for coseismic loading followed by creep during decaying stress in the lower crust?

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F15%3A10296353" target="_blank" >RIV/00216208:11310/15:10296353 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1002/2014JB011708" target="_blank" >http://dx.doi.org/10.1002/2014JB011708</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/2014JB011708" target="_blank" >10.1002/2014JB011708</a>

Result language
angličtina
Original language name
High-temperature fracturing and subsequent grain-size-sensitive creep in lower crustal gabbros: Evidence for coseismic loading followed by creep during decaying stress in the lower crust?
Original language description
The mechanism of shear zone formation in lower crustal, relatively dry rocks is still poorly understood. We have studied the high-temperature deformation of the Hasvik gabbro (northern Norway) which commences by fracturing. The 10-20 mu m wide fracturesshow little displacement. The fine-grained plagioclase and orthopyroxene in the fractures lack a crystallographic preferred orientation (CPO) or a systematic crystallographic orientation with respect to the host grains. Fractures grade into narrow shearzones, which are composed of fine (10-20 mu m), equant grains of recrystallized plagioclase, amphibole, and pyroxene. Recrystallized plagioclase and pyroxene have compositions different from the magmatic grains, suggesting that they have formed by nucleation and growth. Based on conventional plagioclase-amphibole thermobarometry, the shear zones have formed at temperatures and pressures of 700-750 degrees C and 0.5-0.6GPa. The observed primary minerals cut by fractures suggest high-tempe
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DC - Seismology, volcanology and Earth structure
OECD FORD branch
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Project
<a href="/en/project/GA14-15632S" target="_blank" >GA14-15632S: Melt migration and coupled rock deformation dynamics in orogenic lower crust</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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