Experimental Test of Least-Squares Strain Gage Calculation Using Twinned Calcite

Groshong, Richard H.

doi:10.1130/0016-7606(1974)85<1855:etolsg>2.0.co;2

Cited by 118 publications

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“…Calcite twin strain in coarse-grained limestones is measured using the calcite strain gauge technique of Groshong (1972Groshong ( , 1974 and Evans and Groshong (1994). Careful preparation of thin sections is required so that grains are not fractured or twinned during sample preparation.…”

Section: Calcite Twinningmentioning

confidence: 99%

“…Such twins are most commonly less than one micron (1 micron ¼ 0.001 mm) thick. In limestone and marble deformation experiments performed at room temperature (about 25 8C), increasing calcite twin strain results in development of new thin twins; therefore, the twin intensity (#/mm) increases (Turner and Ch'ih, 1951;Turner, 1953;Groshong, 1974;Ferrill, 1998). Experimental deformation of calcite at temperatures of 300 8C and above produces twins that have a width of twinned material that is distinguishable under the microscope, and individual twins may exceed 5 microns in width.…”

Section: Introductionmentioning

confidence: 99%

“…The thin -twin black line width includes a combination of twinned material and the optical effects due to the twin boundaries. Using measured and calculated strains from experimentally deformed twinned calcite in limestone, Groshong (1974) determined that approximately 50% of the black line width represents twinned calcite (also see Groshong et al, 1984b). Thick calcite twins can be resolved optically from the untwinned host.…”

Section: Introductionmentioning

confidence: 99%

“…Working definitions of thin versus thick calcite twins are given by Groshong (1974). In crossed polarized light, both thin and thick twins oriented at a high angle to the microscope axis produce obvious parallel color fringes.…”

Section: Introductionmentioning

confidence: 99%

“…10 microns. The calculations and graphical techniques presented in this paper use data that were rigorously gathered using the calcite strain gauge technique (Groshong, 1974;Evans and Groshong, 1994). For the analysis presented here, it is important that twin intensities and twin widths were measured, not assumed.…”

Section: Introductionmentioning

confidence: 99%

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Calcite twin morphology: a low-temperature deformation geothermometer

Ferrill

Morris

Evans

et al. 2004

Journal of Structural Geology

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306

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Twinning of the e-plane is the dominant crystal -plastic deformation mechanism in calcite deformed below about 400 8C. Calcite in a twin domain has a different crystallographic orientation from the host calcite grain. So-called thin twins appear as thin black lines when viewed parallel to the twin plane at 200-320 £ magnification under a petrographic microscope. Thick twins viewed in the same way have a microscopically visible width of twinned material between black lines. Calcite e-twin width and morphology has been correlated with temperature of deformation in naturally deformed coarse-grained calcite. In this paper, we present a compilation and analysis of data from limestones of the frontal Alps (France and Switzerland) and the Appalachian Valley and Ridge and Plateau provinces (eastern United States) to document this temperature dependence. Mean calcite twin width correlates directly with temperature of deformation such that thin twins dominate below 170 8C and thick twins dominate above 200 8C. Above 250 8C dynamic recrystallization is an important deformation mechanism in calcite. Mean twin intensity (twin planes/mm) correlates negatively with temperature, and a cross plot of twin intensity with twin width can yield information about both strain and temperature of deformation. These relationships provide a deformation geothermometer for rocks that might otherwise yield little or no paleotemperature data.

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Section: Calcite Twinningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Calcite twin morphology: a low-temperature deformation geothermometer

Ferrill

Morris

Evans

et al. 2004

Journal of Structural Geology

Self Cite

306

261

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Combining geophysical data and calcite twin stress inversion to refine the tectonic history of subsurface and offshore provinces: A case study on the Cooper-Eromanga Basin, Australia

Kulikowski

Amrouch

2017

Tectonics

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The use of core samples, borehole image logs, and seismic data is common practice for obtaining valuable structural data; however, these data are often obtained in isolation from other methods and not usually used for paleostress inversion processes. Therefore, for the first time, we present a new approach for constraining paleoprincipal stress orientations and regimes by integrating geophysical data (seismic and well data) with calcite twin principal stress orientation inversion analysis to refine the evolution of entirely subsurface or offshore basins; a case study on the subsurface Cooper‐Eromanga Basin, Australia. Calcite samples were collected from oriented core, natural fracture data collected from borehole image logs, and fault data interpreted from three‐dimensional seismic surveys. The analysis of microscale, mesoscale and macroscale data constrained the paleoprincipal stress orientations and regimes of six successive tectonic events: (1) NNW‐SSE oriented strike‐slip Carboniferous Alice Springs event; (2) SE‐NW oriented compressional Mid‐Permian event; (3) NE‐SW oriented strike‐slip Late Permian Daralingie event; (4) E‐W compressional Late Triassic Hunter‐Bowen event; (5) E‐W compressional Late Cretaceous event; and (6) N‐S compressional Paleogene event. This study shows the applicability of integrating geophysics with calcite twin stress inversion to decipher the tectonic evolution of entirely subsurface and offshore provinces.

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Strength and Stress Evolution of an Actively Exhuming Low-Angle Normal Fault, Woodlark Rift, SE Papua New Guinea

Mizera

Little

Boulton

et al. 2021

Preprint

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 The active Mai'iu low-angle normal fault dips ~20° at the surface, but is steeper at depth.  A differential stress peak of 140-185 MPa at 6-12 km depth was identified in a zone of mixed-mode seismic-and aseismic slip.  High differential stresses drive slip on a ~35° dipping part of this fault and cause new brittle yielding of strong mafic footwall rocks.  The Mai'iu fault is frictionally weak near the surface (µ≈0.15-0.38), but strong in the middle crust (µ>0.25-0.62).  Reconstructed principal stresses are constrictional and consistent with rolling-hinge style flexure of the footwall.

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Experimental Test of Least-Squares Strain Gage Calculation Using Twinned Calcite

Cited by 118 publications

References 0 publications

Calcite twin morphology: a low-temperature deformation geothermometer

Calcite twin morphology: a low-temperature deformation geothermometer

Combining geophysical data and calcite twin stress inversion to refine the tectonic history of subsurface and offshore provinces: A case study on the Cooper-Eromanga Basin, Australia

Strength and Stress Evolution of an Actively Exhuming Low-Angle Normal Fault, Woodlark Rift, SE Papua New Guinea

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