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Journal Article

Deformation-induced Japan twinning in quartz during incipient mylonitization Available to Purchase

Michel Bestmann, Giorgio Pennacchioni, Bernhard Grasemann
Journal: Geology
Published: 12 July 2021
Geology (2021) 49 (11): 1267–1271.
DOI: https://doi.org/10.1130/G49077.1
... are characterized by a nearly 90° misorientation angle between the c -axes of the host and new grains, which also share one { m } and one {11 2 2} pole, compatible with Japan twinning. This abrupt switch of the c -axis orientation can promote geometrical softening and shear localization. So far, Japan twinning has...
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View PDF for article title, Deformation-induced <span class="search-highlight">Japan</span> <span class="search-highlight">twinning</span> in quartz during incipient mylonitization
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Journal Article

Computational simulations of the structure of Japan twin boundaries in quartz Available to Purchase

Koichi Momma, Toshiro Nagase, Yasuhiro Kudoh, Takahiro Kuribayashi
Published: 01 April 2009
European Journal of Mineralogy (2009) 21 (2): 373–383.
DOI: https://doi.org/10.1127/0935-1221/2009/0021-1893
...Koichi Momma; Toshiro Nagase; Yasuhiro Kudoh; Takahiro Kuribayashi Abstract The structures of Japan twin boundaries in quartz are studied through molecular dynamics simulations and energy minimization calculations. Four types of twinning are grouped under the Japan twin law, comprising 10 subtypes...
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View PDF for article title, Computational simulations of the structure of <span class="search-highlight">Japan</span> <span class="search-highlight">twin</span> boundaries in quartz
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Journal Article

Twin-boundary formation in Japan-law twinned quartz crystals Available to Purchase

Alenka Lenart, Zoran Samardžija, Matjaž Godec, Breda Mirtič, Sašo Šturm
Published: 01 June 2012
European Journal of Mineralogy (2012) 24 (3): 509–517.
DOI: https://doi.org/10.1127/0935-1221/2012/0024-2202
... of planes, which is in accordance with the Japan twin law. The combined spatially resolved EDX and EELS analyses confirmed no compositional changes across the twin boundary. It is concluded that the formation of a straight twin boundary in quartz is related to the earliest stage of crystal growth...
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View PDF for article title, <span class="search-highlight">Twin</span>-boundary formation in <span class="search-highlight">Japan</span>-law <span class="search-highlight">twinned</span> quartz crystals
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Journal Article

Growth history and textures of quartz twinned in accordance with the Japan law Available to Purchase

Koichi Momma, Toshiro Nagase, Takahiro Kuribayashi, Yasuhiro Kudoh
Published: 01 January 2015
European Journal of Mineralogy (2015) 27 (1): 71–80.
DOI: https://doi.org/10.1127/ejm/2014/0026-2411
...Koichi Momma; Toshiro Nagase; Takahiro Kuribayashi; Yasuhiro Kudoh Abstract The growth history of quartz twinned according to the Japan law and the development of fine textures near Japan twin boundaries were analysed using optical microscopy, cathodoluminescence, and computational simulations...
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View PDF for article title, Growth history and textures of quartz <span class="search-highlight">twinned</span> in accordance with the <span class="search-highlight">Japan</span> law
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A CL image of a Japan twin sample from Narushima, Nagasaki Prefecture, Japan. The line drawing schematically shows an outline of the twin and the line reflecting discontinuity in growth.

A CL image of a Japan twin sample from Narushima, Nagasaki Prefecture, Japa... Available to Purchase

Published: 01 January 2015
Fig. 3 A CL image of a Japan twin sample from Narushima, Nagasaki Prefecture, Japan. The line drawing schematically shows an outline of the twin and the line reflecting discontinuity in growth.
Image
Series of CL images of a Japan twin sample sliced perpendicular to the composition plane and the pair of co-planar prism faces. The arrow indicates the position of the Japan twin boundary. Approximate positions of the slices are indicated in the photograph of the sample at the lower-right of the figure (online version in colour).

Series of CL images of a Japan twin sample sliced perpendicular to the comp... Available to Purchase

Published: 01 January 2015
Fig. 5 Series of CL images of a Japan twin sample sliced perpendicular to the composition plane and the pair of co-planar prism faces. The arrow indicates the position of the Japan twin boundary. Approximate positions of the slices are indicated in the photograph of the sample at the lower-right
Image
Four variants of Japan twins of quartz projected on the coplanar (101̅0) faces (after Hahn &amp; Klapper, 2003 with the permission of the IUCr). (a) Type I(R); (b) type II(R); (c) type III; (d) type IV. Twin elements 2 and m are shown. R and L denote right-handed quartz (P3221) and left-handed quartz (P3121). Arrows denote polarity of twofold axis parallel to the drawing plane. r, {101̅1}; z, {011̅1}; x, {516̅1} (right-handed) or {61̅5̅1} (left-handed). Subtype I(R)a is identical to I(R), and types I(L) and II(L) are not shown. Orientations of twin individuals at the upper right and lower left of the twins are common in all types.

Four variants of Japan twins of quartz projected on the coplanar (101̅0) fa... Available to Purchase

Published: 01 April 2009
Fig. 1. Four variants of Japan twins of quartz projected on the coplanar (101̅0) faces (after Hahn & Klapper, 2003 with the permission of the IUCr). (a) Type I(R); (b) type II(R); (c) type III; (d) type IV. Twin elements 2 and m are shown. R and L denote right-handed quartz ( P 3 2 21
Journal Article

Morphogenesis of quartz crystals twinned after Japan Law Available to Purchase

Ichiro SUNAGAWA, Hiroyuki IMAI, Masayuki TAKADA, Yukio HOSHINO
Published: 01 January 2004
European Journal of Mineralogy (2004) 16 (1): 91–97.
DOI: https://doi.org/10.1127/0935-1221/2004/0016-0091
...Ichiro SUNAGAWA; Hiroyuki IMAI; Masayuki TAKADA; Yukio HOSHINO Abstract Why quartz crystals twinned after Japan Law take flattened morphology and grow larger than the co-existing single crystals is explained based on the results of previous morphological, X-ray topographic and re-growth...
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View PDF for article title, Morphogenesis of quartz crystals <span class="search-highlight">twinned</span> after <span class="search-highlight">Japan</span> Law
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A unit cell used for MD simulations, in which Brazil twin boundaries parallel to z3 intersect with Japan twin boundaries.

A unit cell used for MD simulations, in which Brazil twin boundaries parall... Available to Purchase

Published: 01 January 2015
Fig. 2 A unit cell used for MD simulations, in which Brazil twin boundaries parallel to z 3 intersect with Japan twin boundaries.
Image
Projection of silicon positions in the two individual crystals of Japan twins onto the m2 plane. (a) Twin relation of subtype III (Momma et al., 2009). (b) A geometry, in which the left half of subtype I(R) is further twinned after the Brazil twin law. Square points, silicon positions of crystal 1; small circles, silicon positions of crystal 2. Open and filled marks show silicon positions on layers with different depths (online version in colour).

Projection of silicon positions in the two individual crystals of Japan twi... Available to Purchase

Published: 01 January 2015
Fig. 9 Projection of silicon positions in the two individual crystals of Japan twins onto the m 2 plane. (a) Twin relation of subtype III ( Momma et al., 2009 ). (b) A geometry, in which the left half of subtype I(R) is further twinned after the Brazil twin law. Square points, silicon
Image
The structure of right-handed quartz projected along (a) [210] and (b) [01̅1]. Rectangles with solid and dashed lines represent the quartz unit cell and the unit corresponding to the twin lattice of Japan twin. The origin of the units is set at a silicon position at (0, 0.53, 1/3).

The structure of right-handed quartz projected along (a) [210] and (b) [01̅... Available to Purchase

Published: 01 April 2009
Fig. 5. The structure of right-handed quartz projected along (a) [210] and (b) [01̅1]. Rectangles with solid and dashed lines represent the quartz unit cell and the unit corresponding to the twin lattice of Japan twin. The origin of the units is set at a silicon position at (0, 0.53, 1/3).
Image
a) Schematic figure of low-temperature quartz, twinned in accordance with the Japan Twin Law with prismatic (m, m1) and rhombohedral (r, z) faces, indicating a typical angle (ϕ) between the inclined c axes. Two morphologically different specimens of Japanese twins from different geological environments described as b) “V-shape” from the Madan ore field, Bulgaria and c) “fan-shape” from Andilamena, Madagascar.

a) Schematic figure of low-temperature quartz, twinned in accordance with t... Available to Purchase

Published: 01 June 2012
Fig. 2 a) Schematic figure of low-temperature quartz, twinned in accordance with the Japan Twin Law with prismatic ( m , m 1 ) and rhombohedral ( r , z ) faces, indicating a typical angle (ϕ) between the inclined c axes. Two morphologically different specimens of Japanese twins from
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(A) Protomylonitic microstructure of a deformed quartz vein (light micrograph, crossed polarizers [XPL]). Shear sense is given. (B) Intragranular microshear zone (MSZ)—site 1 (XPL). (C) Electron backscatter diffraction map, color-coded with respect to texture components in blue (host) and teal (new grains) with 30° orientation variations (step size 200 nm). All other orientations are gray-shaded with respect to the EBSD pattern quality (band contrast). High-angle boundaries are color-coded with respect to misorientation angle intervals in blue (10°–15°) and black (&gt;15°) overlaid by Dauphiné twin boundaries in red (60° rotation around c-axis with 5° variation). (D) Orientation data plotted as pole figures (PFs) (equal area, lower hemisphere [hem.] and additional upper hemisphere for the a-axes; see the Supplemental Material section 1.2). Color-coding follows that in panel C. Right PFs show maxima of contoured PF of the two orientation domains (host, blue; new grains, teal) as presented in Fig. S2E (see footnote 1). Diagram at center of panel shows PF orientation with respect to sample reference frame: S—shear foliation (parallel to vein boundary); LS—stretching lineation; dotted line shows trace of microshear zone boundary (MSB) of specific microstructure. Orange ellipses mark overlap of one of the m-poles (Japan twin misorientation axis); red ellipses, overlap of one of the {1122} poles (Japan-Law twin plane). Angle between the two c-axis maxima is given. Note new grains (teal) contain internal Dauphiné twins, whereas host grain (blue) is nearly free of Dauphiné twinning. Misorientation axes are plotted as inverse pole figures (IPFs; far right of panel) for specific misorientation angle intervals (see the Supplemental Material section 1.2). Internal lines in IPFs mark allowed and forbidden regions of misorientation axis for specific misorientation angle intervals. Important crystallographic directions and planes are marked in first IPF. Note for 80°–90° interval (includes 84.5° Japan twin misorientation), there is clustering near one of the m-poles.

(A) Protomylonitic microstructure of a deformed quartz vein (light microgra... Available to Purchase

Published: 12 July 2021
lineation; dotted line shows trace of microshear zone boundary (MSB) of specific microstructure. Orange ellipses mark overlap of one of the m -poles (Japan twin misorientation axis); red ellipses, overlap of one of the {11 2 2} poles (Japan-Law twin plane). Angle between the two c -axis maxima is given
Image
Twin boundary structures of subtypes I(R) and III. (a, b) Structure of subtype I(R) with twin rotation axis perpendicular to the (1̅21̅2) composition plane, projected along (a) [210] and (b) [01̅1]. (c, d) Structure of subtype III projected along (c) [210] and (d) [01̅1]. R and L denote right- and left-handed quartz. R- and L-quartz in subtype III are related by the twin mirror operation on (1̅21̅2). On the basis of the coordinate system of L-quartz, the axes orientations of the left part of subtype III are the same as those of subtype I(R). Positions of twin boundaries are indicated by dashed vertical lines. Rectangles with dashed line represent the twin lattice of the Japan twin. Crystal forms show the schematic orientation of twins with r, {101̅1}; z, {011̅1}; m, {101̅0}.

Twin boundary structures of subtypes I(R) and III. (a, b) Structure of subt... Available to Purchase

Published: 01 April 2009
by dashed vertical lines. Rectangles with dashed line represent the twin lattice of the Japan twin. Crystal forms show the schematic orientation of twins with r , {101̅1}; z , {011̅1}; m , {101̅0}.
Image
Enlarged view of Fig. 6b without the edge detection filter applied. The black arrows indicate the {11 2¯2} Japan twin composition plane, and the white arrows indicate cracks. Note that the cracks are crossing the straight {11 2¯2} composition plane.

Enlarged view of Fig. 6b without the edge detection filter applied. The b... Available to Purchase

Published: 01 January 2015
Fig. 7 Enlarged view of Fig. 6b without the edge detection filter applied. The black arrows indicate the {11 2 ¯ 2} Japan twin composition plane, and the white arrows indicate cracks. Note that the cracks are crossing the straight {11 2 ¯ 2} composition plane.
Journal Article

Application of pore throat size distribution data to petrophysical characterization of Montney tight-gas siltstones Available to Purchase

Takashi Akai, James M. Wood
Published: 01 June 2018
Bulletin of Canadian Petroleum Geology (2018) 66 (2): 425–435.
... , T. and Wood , J.M. 2014 . Petrophysical analysis of a tight siltstone reservoir: Montney Formation, Western Canada . In: 20th Formation Evaluation Symposium of Japan . Society of Petrophysicists and Well-Log Analysts . Akai , T. , Takakuwa , Y. , Sato K. and Wood...
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View PDF for article title, Application of pore throat size distribution data to petrophysical characterization of Montney tight-gas siltstones
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Journal Article

The Cardston Earthquake Swarm and Hydraulic Fracturing of the Exshaw Formation (Alberta Bakken Play) Available to Purchase

Ryan Schultz, Shilong Mei, Dinu Pană, Virginia Stern, Yu Jeffrey Gu, Ahyi Kim, David Eaton
Published: 10 November 2015
Bulletin of the Seismological Society of America (2015) 105 (6): 2871–2884.
DOI: https://doi.org/10.1785/0120150131
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View PDF for article title, The Cardston Earthquake Swarm and Hydraulic Fracturing of the Exshaw Formation (Alberta Bakken Play)
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Includes: Supplemental Content
Image
Crystallography of quartz clusters determined through EBSD. Clusters in CL images are displayed next to Euler orientation maps and corresponding pole figures. Data points (pixels) are represented by Euler colors that indicate different crystallographic orientations and are plotted in upper hemisphere stereographic projections. Dashed white lines delineate prominent crystal fractures bordered by Dauphiné twins (D). Crystal shape and CL zone configurations were combined with EBSD data to model simplistic 3D solutions of clusters in SHAPE v7.4 software (see Methods; Dowty 1980a, 1987). Modeled crystal margins may not replicate true margins due to complex asymmetric habits. Arborescent zones (described in Zoning, Figs. 9–11) are delineated in CL images. (a) Five nearly identical parallel units disguised as a single crystal. Each core has brighter oscillating CL zones surrounded by much darker CL zones. Units 1 and 2 are most resembled in Slice 1 because equivalent levels of Units 3–5 lie outside the section plane. A 3D reconstruction requires remarkably organized interpenetrations of elongate prismatic units to replicate CL zoning in both Slices 1 and 2 [sample T-12 (C11, 10)]. (b) Units in Verespatak or parallel relation. Unit cores show brighter oscillating CL zones encased in darker CL zones. A 3D reconstruction requires trigonal symmetry and asymmetric habit. The re-entrant edge (RE) is also characteristic of growth twins (Hartman 1956; Sunagawa et al. 2004) [sample T-20 (2.9)]. (Color online.) (c) Repeated Esterel twinning on Unit 3 creates a 113° angle between Units 1 and 2. The two sandwiching units are thus, by symmetry, related. Because equivalent unit levels are not exposed, unit size and zoning patterns appear somewhat dissimilar. Note the configuration of faint, brighter CL zones at the core of Unit 1 (see Zoning) [sample T-13 (H6)]. (d) Repeated Esterel twinning on parallel Units 2 and 3 creates a 113° angle between Units 1 and 4. Like c, a 3D model requires the prism form to replicate unit shapes and CL zoning. EBSD map and Dauphiné twins not shown (see Appendix1 2) [sample SF-3 (3.1)]. (e) Megacrystic cluster comprising eight units. Larger units do not differ significantly in zoning pattern, whereas Units 3–6 are smaller, located in the megacryst exterior, and can differ in zoning pattern. All units are in parallel except Unit 5, a Verespatak twin. Asymmetric Verespatak (Japan) twin development (i.e., a small twin astride a larger one) is common in nature (Drugman 1927). Note Unit 5's threefold distribution of Dauphiné twins and its layers of arborescent CL zones (see Zoning, Figs. 9–11) [sample T-12 (B)]. (Color online.)

Crystallography of quartz clusters determined through EBSD. Clusters in CL ... Available to Purchase

Published: 01 February 2020
Unit 5, a Verespatak twin. Asymmetric Verespatak (Japan) twin development (i.e., a small twin astride a larger one) is common in nature ( Drugman 1927 ). Note Unit 5's threefold distribution of Dauphiné twins and its layers of arborescent CL zones (see Zoning , Figs. 9 – 11 ) [sample T-12 (B
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Face symbols for quartz twinned in accordance with the Japan law, which will be used throughout this study.

Face symbols for quartz twinned in accordance with the Japan law, which wil... Available to Purchase

Published: 01 January 2015
Fig. 1 Face symbols for quartz twinned in accordance with the Japan law, which will be used throughout this study.
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a) The natural Japan-law twinned crystal attached to the bedrock is indicated by white arrow. b) Double-side polishing of the coplanar &lt;1̄100&gt; prism faces and c) the wedge-polished TEM specimen with residue of bedrock, observed in transmitted-light polarizing microscope.

a) The natural Japan-law twinned crystal attached to the bedrock is indicat... Available to Purchase

Published: 01 June 2012
Fig. 1 a) The natural Japan-law twinned crystal attached to the bedrock is indicated by white arrow. b) Double-side polishing of the coplanar <1̄100> prism faces and c) the wedge-polished TEM specimen with residue of bedrock, observed in transmitted-light polarizing microscope.