Quantitative analysis of crystal/grain sizes and their distributions in 2D and 3D

Berger, Alfons; Herwegh, Marco; Schwarz, Jens-Oliver; Putlitz, Benita

doi:10.1016/j.jsg.2011.07.002

Cited by 81 publications

(71 citation statements)

References 71 publications

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“…Grains defined as recrystallized grains are all small. Comparisons of 2-D and 3-D mylonite microstructure data sets [Berger et al, 2011] give similar results. Some of these small relict grains may represent recrystallized grains that formed early in the deformation history and subsequently accumulated strain.…”

Section: Results: Separation Of Relict and Recrystallized Grain Populmentioning

confidence: 52%

“…Piezometers derived using other statistical measures [Ranalli, 1984;Berger et al, 2011] of average grain size are calculated from the same data used to calculate the sliding resolution piezometer and are shown on Figure 4b for comparison. Inspection of our data suggests that the step size needs to be smaller than one fifth of the diameter of smallest grains in the recrystallized grain size population.…”

Section: Results: Ebsd-based Quartz Recrystallized Grain Size Piezomementioning

confidence: 99%

See 1 more Smart Citation

The recrystallized grain size piezometer for quartz: An EBSD‐based calibration

Cross

Prior

Stipp

et al. 2017

Geophysical Research Letters

140

154

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We have reanalyzed samples previously used for a quartz recrystallized grain size paleopiezometer, using electron backscatter diffraction (EBSD). Recrystallized and relict grains are separated using their grain orientation spread, which acts as a measure of intragranular lattice distortion and a proxy for dislocation density. For EBSD maps made with a 1 μm step size, the piezometer relationship is D = 103.91 ± 0.41 ∙ σ−1.41 ± 0.21 (for root‐mean‐square mean diameter values). We also present a “sliding resolution” piezometer relationship, D = 104.22 ± 0.51 ∙ σ−1.59 ± 0.26, that combines 1 μm step size data at coarser grain sizes with 200 nm step size data at finer grain sizes. The sliding resolution piezometer more accurately estimates stress in fine‐grained (<10 μm) samples. The two calibrations give results within 10% of each other for recrystallized grain sizes between 10 μm and 100 μm. Both piezometers match the original light optical microscopy quartz piezometer within error.

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Section: Results: Separation Of Relict and Recrystallized Grain Populmentioning

confidence: 52%

Section: Results: Ebsd-based Quartz Recrystallized Grain Size Piezomementioning

confidence: 99%

The recrystallized grain size piezometer for quartz: An EBSD‐based calibration

Cross

Prior

Stipp

et al. 2017

Geophysical Research Letters

140

154

View full text Add to dashboard Cite

show abstract

“…Fujisaki et al, 2012), is also of great interest in petrology (e.g. Berger et al, 2012;Bryon et al, 1995). Briefly, it involves cutting and/or polishing the sample into several successive slices.…”

Section: Serial Sectioningmentioning

confidence: 99%

External and internal features of garnet revealed by the multifocus imaging technique

Thiéry

2013

Micron

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“…As a proxy for grain size we use the mean equivalent circular diameter (ECD) and/or the area weighted mean diameter (AWD), for discussion of presentation of grain sizes see Berger et al, 2011. In addition, grain size was determined from EBSD image maps of 80 x 80 pm^ up to 1000 x 1000 pm^ with a step size of 0.1 to 2.0 pm using the processing software OIM (EDAX-TSL Inc.). Goethite, FeOOH, are components of the Banded Iron Formation and referenced in the following chapters.…”

Section: Grain Size Determinationmentioning

confidence: 99%

Microstructure and Crystallographic Preferred Orientation (Cpo) of Hematite Ores From the Sishen Mine, Northern Cape Province, South Africa

Siemes

2013

South African Journal of Geology

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Banded iron fonnatiotis (BIFs) are described as banded chetiiical sedimentary rocks composed of major amounts of magnetite, hematite and quartz, with variable atnounts of iron bearing tiiinerals like carbonates (e.g. siderite, ankerite) and silicates (e.g. greenalite, gtTmerite). The BIFs are tratisforined to high grade iron ores by removal of quartz and transformation of almost all iron bearing minerals to hematite. On macroscopic and microscopic scale the high grade hetnatite ores generally reveal a more or less visible lamination caused by alternating layers of different grain sizes. In addition to the microstructt.ire (grain size, grain shape etc.), the crystallographic preferred orientation is a powerful tool to characterize rocks and ores. The overall crystallographic preferred orientation (CPO, texture) of volumes can be determined by neutron diffraction and the local texture on small areas of polished sections by electron backscattering diffraction (EBSD). The CPO of volumes of all hematite ore types (including a conglomerate pebble) of the Sishen Mine is characterized by a weak, usually circular c-axis maximum aligned to the normal of the lamination of the ores, and seems to be typical for this essentially unmetamorphosed and undeformed ores. The crystallographic otietitation of grains of the hematite ores determined locally by EBSD shows in general the same preferred orientation. But, it is remarkable that partially the CPO is quite different and inherited from grain orientations of preceding primary minerals (e.g. magnetite, goethite, siderite/calcite, ankedte/dolomite) of the Banded Iron Formation, without any microscopic visible indication.

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Quantitative analysis of crystal/grain sizes and their distributions in 2D and 3D

Cited by 81 publications

References 71 publications

The recrystallized grain size piezometer for quartz: An EBSD‐based calibration

The recrystallized grain size piezometer for quartz: An EBSD‐based calibration

External and internal features of garnet revealed by the multifocus imaging technique

Microstructure and Crystallographic Preferred Orientation (Cpo) of Hematite Ores From the Sishen Mine, Northern Cape Province, South Africa

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