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  Semi‐brittle deformation of Carrara marble: Hardening and twinning induced plasticity

Rybacki, E., Niu, L., Evan, B. (2021 online): Semi‐brittle deformation of Carrara marble: Hardening and twinning induced plasticity. - Journal of Geophysical Research: Solid Earth.
https://doi.org/10.1029/2021JB022573

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Rybacki, Erik1, Autor              
Niu, Lu1, Autor              
Evan, B.2, Autor
Affiliations:
14.2 Geomechanics and Scientific Drilling, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146035              
2External Organizations, ou_persistent22              

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Schlagwörter: DEAL Wiley
 Zusammenfassung: Semi-brittle flow occurs when crystal plasticity and cataclastic mechanisms operate concurrently and may be common at mid-levels of the Earth’s crust. Using a Paterson gas-deformation apparatus, we performed 67 conventional triaxial deformation experiments on dry samples of Carrara marble in the temperature range of T = 20 - 800°C; confining pressures (PC) were 30, 50 100, 200, and 300 MPa, and strain rates (urn:x-wiley:21699313:media:jgrb55357:jgrb55357-math-0001) were 10-3, 10-4, 10-5, and 10-6 s-1. Axial strains (ε ) were ≲ 0.12. The measured (differential) stress, urn:x-wiley:21699313:media:jgrb55357:jgrb55357-math-0002, changes with strain at most applied conditions. At ε = 0.05, both stress and the hardening coefficient (h), i.e., the rate of increase of stress with strain, increase as T decreases and PC increases. At T ≲ 400°C, h is quite large and the sensitivity of urn:x-wiley:21699313:media:jgrb55357:jgrb55357-math-0003 on urn:x-wiley:21699313:media:jgrb55357:jgrb55357-math-0004 is low, while both are sensitive to increasing pressure. In this temperature range, the mechanical behavior of the marble is very similar to that exhibited by high-strength, high-ductility, hexagonal metals that deform by processes called twinning induced plasticity (TWIP). Twinning and dislocation motion are abundant in the samples, as are inter- and intra-crystalline micro-fractures. The concurrent activation of these deformation mechanisms leads to complex relationships of urn:x-wiley:21699313:media:jgrb55357:jgrb55357-math-0005 and h with the applied T- PC - urn:x-wiley:21699313:media:jgrb55357:jgrb55357-math-0006 conditions. This behavior suggests that peak stresses for calcite rocks deforming by semi-brittle processes will occur at PC - T conditions of the middle crust, and that they might be more strongly influenced by total strain rather than by strain rate.

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 Datum: 2021-11-25
 Publikationsstatus: Online veröffentlicht
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 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1029/2021JB022573
GFZPOF: p4 T8 Georesources
GFZPOFWEITERE: p4 T3 Restless Earth
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Titel: Journal of Geophysical Research: Solid Earth
Genre der Quelle: Zeitschrift, SCI, Scopus
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Seiten: - Band / Heft: - Artikelnummer: - Start- / Endseite: - Identifikator: ISSN: 2169-9313
ISSN: 2169-9356
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/jgr_solid_earth
Publisher: American Geophysical Union (AGU)