Experimental Deformation of Calcite Crystals

Turner, Francis J.; Griggs, D. T.; Heard, H.C.

doi:10.1130/0016-7606(1954)65[883:edocc]2.0.co;2

Cited by 297 publications

(121 citation statements)

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“…For reference, the critical resolved shear stresses for f slip in calcite is 216 MPa, and for r slip it ranges from 145 to 185 MPa [Turner et al, 1954;Griggs et al, 1960]. Although our inferred value of k is higher than these yield stresses measured for specific slip systems of calcite, we consider it likely that the macroscopic yield would require a significantly higher stress level.…”

Section: Methodscontrasting

confidence: 47%

“…The marbles, even the ones with very low porosity like the Carrara marble, undergo the brittle to plastic transition at room temperature for confining pressures accessible in the laboratory [Robertson, 1955;Paterson, 1958;Heard, 1960;Rutter, 1974]. This is probably due to the fact that calcite requires relatively low shear stresses to initiate mechanical twinning and dislocation slip even at room temperature [Turner et al, 1954;Griggs et al, 1960]. The transition occurs at a pressure that decreases with increasing grain size [Fredrich et al, 1990].…”

Section: Introductionmentioning

confidence: 99%

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Dilatancy, compaction, and failure mode in Solnhofen limestone

Baud¹,

Schubnel²,

Wong³

2000

J. Geophys. Res.

176

211

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Section: Methodscontrasting

confidence: 47%

Section: Introductionmentioning

confidence: 99%

Dilatancy, compaction, and failure mode in Solnhofen limestone

Baud¹,

Schubnel²,

Wong³

2000

J. Geophys. Res.

176

211

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“…[3] In the laboratory, marbles have been studied widely for they can undergo a brittle-plastic transition at room temperature as calcite requires low shear stresses to initiate plastic processes: r-, f-dislocation glide and twinning are activated even at room temperature [Turner et al, 1954]. A number of these studies have documented the mechanical behavior of Carrara marble [Rutter, 1974;Fredrich et al, 1989;Renner et al, 2002;Schubnel et al, 2005].…”

Section: Introductionmentioning

confidence: 99%

Transient creep, aseismic damage and slow failure in Carrara marble deformed across the brittle‐ductile transition

Schubnel

Walker²,

Thompson

et al. 2006

Geophysical Research Letters

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[1] Two triaxial compression experiments were performed on Carrara marble at high confining pressure, in creep conditions across the brittle-ductile transition. During cataclastic deformation, elastic wave velocity decrease demonstrated damage accumulation (microcracks). Keeping differential stress constant and reducing normal stress induced transient creep events (i.e., fast accelerations in strain) due to the sudden increase of microcrack growth. Tertiary creep and brittle failure followed as damage came close to criticality. Coalescence and rupture propagation were slow (60 -200 seconds with $150 MPa stress drops and millimetric slips) and radiated little energy in the e x p e r i m e n t a l f r e q u e n c y r a n g e ( 0 . 1 -1 M H z ). Microstructural analysis pointed out strong interactions between intra-crystalline plastic deformation (twinning and dislocation glide) and brittle deformation (microcracking) at the macroscopic level. Our observations highlight the dependence of acoustic efficiency on the material's rheology, at least in the ultrasonic frequency range, and the role played by pore fluid diffusion as an incubation process for delayed failure triggering. Citation: Schubnel,

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“…Shearing (martensitic transformation) as a possible transformation mechanism between OREN and CLEN was first described by Turner et al (1960). Martensitic transformation of OREN to CLEN always results in an even number of CLEN lamellae for each domain width, because a single OREN lamella will transform to a pair of CLEN lamellae.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Indications for Protoenstatite Precursor of Cometary MgSiO ₃ Pyroxene: A Further High-Temperature Component of Comet Wild 2

Schmitz¹,

Brenker²

2008

ApJ

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Microstructural studies by transmission electron microscope (TEM) techniques of a microtomed cometary enstatite (Mg/Si 0.858; Fe/Si 0.027; Ca/Si 0.01; Al/Si 0.009; Cr/Si 0.01) from Wild 2 sampled during NASA's Stardust mission were conducted. The enstatite is characterized by high stacking disorder parallel (100) which includes alternating clinoenstatite (CLEN) and orthoenstatite (OREN) lamellae and (100) twins. In addition a widespread occurrence of 4.5 wide half-planes parallel (100) are detected, which leads to 13.5 and 22.5Å A polytypes of the structure. These microstructural features are indicative of the direct transformation from a protoenstatite (PEN) precursor, which requires temperatures of more than 1275 K and rapid cooling (110 K hr ). Our finding represents a further high-temperature component originally present in the cold icy region where Ϫ1 comet Wild 2 was formed.

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Experimental Deformation of Calcite Crystals

Cited by 297 publications

References 0 publications

Dilatancy, compaction, and failure mode in Solnhofen limestone

Dilatancy, compaction, and failure mode in Solnhofen limestone

Transient creep, aseismic damage and slow failure in Carrara marble deformed across the brittle‐ductile transition

Microstructural Indications for Protoenstatite Precursor of Cometary MgSiO ₃ Pyroxene: A Further High-Temperature Component of Comet Wild 2

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Experimental Deformation of Calcite Crystals

Cited by 297 publications

References 0 publications

Dilatancy, compaction, and failure mode in Solnhofen limestone

Dilatancy, compaction, and failure mode in Solnhofen limestone

Transient creep, aseismic damage and slow failure in Carrara marble deformed across the brittle‐ductile transition

Microstructural Indications for Protoenstatite Precursor of Cometary MgSiO 3 Pyroxene: A Further High-Temperature Component of Comet Wild 2

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Microstructural Indications for Protoenstatite Precursor of Cometary MgSiO ₃ Pyroxene: A Further High-Temperature Component of Comet Wild 2