' I ./ L' 0/ῌ02' ,**+ $Structural Geology, No. ./, 0/ῌ02, ,**+%

 
SEM-EBSD ῌ !"# $%&Crystallographic orientation analysis of quartzfeldspar ultramylonite using electron backscatter di#raction in the SEM'()**Norio Shigematsu*,**+  /  ,, *  

Institute of Geoscience, Geological Survey of Japan,
National Institute of Advanced Industrial Science andTechnology, AIST Tsukuba Central 1, +ῌ+ῌ+ Higashi,
Tsukuba -*/ῌ2/01, JapanKey Words : EBSD, SEM, feldspar, ultramylonite,ﬁne grain size, CPO+,- 
!" # $SEM% &' ( (" #) *+,-),.//0 $Trimby et al., +332 ; Heidelbach et al., ,*** ; Jian et al., ,*** ,1% 234&' 3* ,5 !6789:;<=' >
? !78 $EBSD% $Dingley, +32. ; Prior et al.,+333% @ABC $OC C% $Prior et al., +330% )5=DEFGHIFGJK,5=2)D0 EBSD /&3 .. LMN
OFG $' ,***%
P3( (" #)QRSTUVWXTYJZ[A\]&' 3^F $ ,/ mm% J._,!3`&a]0 b= cdef3JK,ghiZ[3Z[A;QRTj\k' 0

&!"e3JK,(#Z[3Z[A;\k2)Ma]0 <l< SEM-EBSD ;G
d2Gm3$%&n\o)2p]' efῌ&e;q'rs()ot)
3*+,3-u&' vVwxyz{|zw)}dG
.~_,+lmrFG2)D/
$Sibson, +311 ,1% <l<,Dm' 2Gb]vVwxyz{|zw-3&e; SEM-EBSD J.< &)1,
cd' Fliervoet et al.
$+331% ]&' TWwx Sj,3)0]<=vVwxyz{|zw/;<D' SEM-EBSD JZ[A3&ef/35.' &e/&5, 2G&&e3Z[3T
TWD,l5=2)c' vVwxyz{|zw-3&e!D + mm 12)I3F' b=4, D5<=k`D6]0)K78lm]0 Fm2Gm3$%' &e3Z[39iD)K2)M`;6,M3<:&zW3STV;3 David J. Prior
' John Wheeler ))Mefῌ&evVwxyz{|zw3 SEM-EBSD JZ[A3`;5= <]&efῌ&evVwxyz{|zw; SEM-EBSD J.`o o$%=)¡3¢£' ¡3\>/NOo  EBSD+. EBSD !/01%2EBSD &?¤ !6D4)]g@.Ai?<¥¦l§B¨©VT;ª5=>' «¬­x®C¤;¯2oZ° ± $Fig. + a% EBSD 3²T
$EBSP% DDmGE¯F³3GH& !634)]3´BJ.\b µX¶V{·¸¹T·ºJGd' Al 3» ?¤ !&H~ EBSD

Fig. +(a) Schematic illustration of electron backscatter di#raction. (b) Two-dimensional schematic illustration of the
trajectories of electrons interacting with multiple nuclei in the plane perpendicular to the tilt axis, modeled through aMonte-Carlo simulation (after Prior et al. +333).

¼ 65 ¼

xy»M 1*  ,* kV   ,./ mm  Fig. + b   ! "#$%&'() EBSP *+,-, ./0 12
 EBSP *+3 +*nm ! Prior et al., +333 4 3 567-/0 1* 8
 ./0 EBSP 9:3; ;)
/ -  <*!), ;=)>?)@/="# A, / SEM BC"#3D$E FE  SEM FG'HI%-.)J.) K .?&LM Al 3 ;)'= /* nm "N ;)@= ,** nm "#(.) K Humphreys, +332
,O SEM )*3 P%QRSTGUTQV?,WHXYGZ"N[+,\]^ FE-SEM _.`K! /a InLens
E FE-SEM 3  bD/!/0 EBSP
0c d18 K,e 23 ,***/ EBSD 345f5g6 78
!  9:hTijZkg6345[+l;mne >3<o EBSP (.) K,e ./0 pGTh%qrs
=6 45ij%tuv>?w
78 !
).x@A K8?M EBSD By3z-, o<e EBSP (6? SEM
@AK-/03FG'HIK-/0 >"a8BC"#3C{ / D \]-^ EF8/09:G
HI,|JK  JKI39: +* nm }
! / EBSP *345 +* nm LM
/0 JK/K?e, EBSP (.)3Ne <o EBSP (/03 JK,e @AJ OP)*3~,E), e? D OenQ,|D (6?R3SK
 ZvZtRZQ3XYGZ FE
T-^ +** nm 'h'! Prior etal., +333,ῌ ῒῐ῎῏῍ΐῑEBSD UVW-^ [+3LM/EBSP  SIT sR/3 CCD sR
Xc Fig. , a Hough YUZ[Zk d18.)W
  Hough Y3 EBSP o \e !e3[+]^\e)_`M 23 ,***12 aP bῌben[ZkcUc/).x )|-e,/ ;Fig. ,(a) Bitmap of EBSP of a plagioclase grain. (b)Windows of the HKL Channel acquisition software. Key
reﬂectors in (a) are picked by hand-drawing onto thebitmap image (left window), and these are indexed (rightwindow).

d EBSD UVW3 efb b
3-e-  g-den3`! Prior pers. comm. hn g-;den Q ?ne,S¡¢Z.)3£i¤3j¥# ¦§,VW.),[ZkU j¥#,-^ kU[Zk /Zk^¨ 'Zp
Z¢©' ª«nd18 Fig. , b ª«78,brt¬Y 'tuT%3 Priorand Wheeler +333 ­®?ne ,O
pZ¢©' /d18[¯ le|3mC nop..b-^ [+W_` e! pZ¢©' /d18[¯ le|op°3 EBSP o <e.
) 78! ./03±²Zb-^b / q efb + ³ Q , ³´K,
@A 78, Prior and Wheeler, +333 .
.)3Or9 BC"#s-C) /E),
4 pZ¢©' /d18[¯3 pZ¢©'tµ/ 1.῍ l-,e Priorand Wheeler, +333 .{ 3῍ 3 ¶*+*· ;5¸¹u]^´! aPºv3kU
[Zk-^ !wW]¼ 66 ¼»n1m o ./ ¡ m¹º>U³j´=>UIhR vSEM-EBSDw 5"ῌmYZ[\]^_`^[AG:    !"#$%& "'() *+, -.
 /*!"01 2345,6 7 586" 9 :;<;/* =*"'>?@A B6" C" 3 :< <D=
EF G =*" B6" c HI, 0*JIKL54M@B6"
N ;OP!"
Q "
 RS?TT" + U!VWS ".0 -*X0* #>!
Q
1> >!"" > +* $X,* $ "
EBSD YZ[\]^_`^[%abcd_ U
A EBSD 5,! "e f58
6&' !" ". !gh$e R(  i)*&'&+j>k858?6> l4*,m
EBSP -"$%ngh$
!gh$ῌmYZ[\]^_`^[
 ./op0qr1234s56789*55,tu$?>!" vShigematsu, +333 ; Hiraga,et al., +333 ; Shigematsu and Tanaka, ,*** 6kwG:^xyz ῌ y{Z|1}~|CamScanX/** Crystal Microprobe 5,gh$
G:gh$; abcd_T)cd_>!" vFig. - aw 6+ Fig. - vaw A ; vOC ;w ?@<=>U;4
A5, [\z[ /*" vPrior et al.,+330w
?5> ?@>U ?T)A

K "=>U vBSEw B>U vSEw C6$%3" ?T)A K ">UD
K ">334EF ;F>U4G>UHI* >UJ "34?5>K7"34 >M" vPrior
5,pers. comm.w".) K EBSD G:4LM ?NOP
QL3RS$ T ?5>K
7"34 >M#S$GT> EBSP -) $ ?U V@ + WSk> EBSP -) 6@
6h$ 3 _^Zy5"WX
5, ?YZU "34 [>  3RF
 + U!WS7
\76
 ?5>K7"$% NOPQg!
gh$ NOPQ5, EBSP m ]F"34/*^>ῌ>_`"34>a !
 ,/ kV ,* nA 48#`>gh$ 3
$%!,#S$GT b>M e Fig.
- vaw >? c¡ /*" U !$ U>!"  ! >M$¢?8K6 U  +mm> 3 5,£ 6"4@ OPg8¤$,m6 EBSP -"34¥d>!h$ 358*!$ Fig. - vbw¦ §e ;¨fg vCPOw  @©ªaZz«¬ vKrule, +321 ; Ji et al., +33.
6kw F) *M$ $ X JIh!"%
UJIhF$«dz­®¯ª°± vWenk etal., +320 ; Wenk and Pannetier, +33*w i²>U³j´5"k(µlIhF"R? vFitz Geraldet al., +32- ; Shigematsu and Tanaka, ,***w g¶Fig. (a) OC image of a typical microstructure in a quartz-feldspar ultramylonite. EBSD measurement points are shownas numbered dots. (b) CPOs of plagioclase ·+**¸ , ·*+*¸ and ·**+¸ in the ultramylonite. Equal-area, upper-hemisphere
projections of ,** grain measurements. The specimen reference system is deﬁned as Z being perpendicular to the foliation,and X being parallel to lineation.

¼ 67 ¼¸¹º» !"# CPO $%&'()*+,-. /012, SEM-EBSD 345 !6"# 789:;<'3=>?@3ABC D403./E&1FG ;C HI&-DJK LMD
N3OP DQE0/ERS3TUV
῎

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WXY?Z[ David J. Prior \] John Wheeler \]3&^Z[ SEM-EBSD _`ab c3def ghi.Q WXY?Z[ jk lJian Zhentingm \] lnop?Z[m 3&3q5rQ sZ[ tuvw\]3&xy3z{Q|}~&[}~t l  +,1.*,2/m[j G5J3dMD }~ Z[I t l33Aῌ
/,.m  //3 ¡¢£M῏ῌ

Dingley, D. J., +32., Di#raction from sub-micronareas using electron backscattering in a scanning electron microscope. Scanning ElectronMicrosc., ,, /03ῌ/1/.
Fitz Gerald, J. D., Etheridge, M. A. and Vernon, R.
H., +32-, Dynamic recrystallization in a naturally deformed albite. Text. Microst., /, ,+3ῌ,-1.
Fliervoet, T., White, S. and Drury, M., +331, Evidence for dominant grain-boundary sliding deformation in greenschist- and apmphibolitegrade polymineralic ultramylonites from theRedbank Deformed Zone, Central Australia.
Jour. Struc. Geol., +3, +.3/ῌ+/,*.
Heidelbach F., Kunze, K. and Wenk, H-R., ,***,
Texture analysis of a recrystallized quartzite
using electron di#raction in the scanning electron microscope. Jour. Struct. Geol., ,,, 3+ῌ+*..
Hiraga, T., Nagase, T. and Akizuki, M., +333, The
structure of grain boundaries in granite-origin
ultramylonite studied by high-resolution electron microscopy. Phys. Chem. Minerals, ,0, 0+1
ῌ0,-.
Humphreys, F. J., +332, Quantitative metallography
by electron backscattered di#raction. Jour.
Microsc., +3/, +1*ῌ+2/.
Ji, S., Zhao, X. and Zhao, P., +33., On the measurement of plagioclase lattice preferred orientations. Jour. Struct. Geol., +0, +1++ῌ+1+2.

Jian, Z., Prior, D. J. and Wheeler, J., ,***, Albite CPO
and grain misorientation distribution in a lowgrade mylonite : implication for granular ﬂow.
Jour. Struct. Geol., ,,, +00-ῌ+01..
Kruhl, J., +321, Preferred lattice orientations of plagioclase from amphibolite and greenschist
facies rock near the Insubric Line (WesternAlps). Tectonophysics, +-/, ,--ῌ,.,.
¤ ¥¦ ,*** SEM-EBSP _`ab34D§¨¨© 789:$% ª«¬( no. .. 0-ῌ00.
Prior, D. J., Boyle, A. P., Brenker, F., Cheadle, M. C.,
Day, A., Lopez, G., Peruzzo, L., Potts, G. J.,
Reddy, S., Spiess, R., Timms, N. E., Trimby, P.
W., Wheeler, J. and Zetterstrom, L., +333, Theapplication of electron backscatter di#raction
and orientation contrast imaging in the SEM
to textural problems in rocks. Am. Mineral., 2.,+1.+ῌ+1/3.
Prior D. J. Trimby, P. W., Wever, U. D. and Dingley,
D. J., +330, Orientation contrast imaging of microstructures in rock using forescatter detectors in the scanning electron microscope. Mineral. Mag., 0*, 2/3ῌ203.
Prior, D. J. and Wheeler, J., +333, Feldspar fabrics ina greenschist facies albite-rich mylonite fromelectron backscatter di#raction. Tectonophysics, -*-, ,3ῌ.3.
Shigematsu, N., +333, Dynamic recrystallization in
deformed plagioclase during progressive shear
deformation. Tectonophysics -*/, .-1ῌ./,.
Shigematsu, N. and Tanaka, H., ,***, Dislocation
creep of ﬁne-grained recrystallized plagioclase
under low-temperature conditions. Jour.
Struct. Geol., ,,, 0/ῌ13.
Sibson, R. H., +311, Fault rocks and fault mechanisms. Jour. Geol. Soc. London, +--, +3+ῌ,+-.
­®w ,*** EBSP ¯°±²³E´ µ ¶
TSL ·  OIM ACADEMY.
Trimby, P. W., Prior, D. J. and Wheeler, J., +332,
Grain boundary hierarchy development in aquartz mylonite. Jour. Struct. Geol., ,*, 3+1ῌ3-/.
Trimby, P. W. and Prior D. J., +333, Microstructural
imaging techniques : a comparison between
light and scanning electron microscopy. Tectonophysics, -*-, 1+ῌ2+.
Wenk, H-R., Bunge, H. J., Jansen, E. and Pannetier,J., +320, Preferred orientation of plagioclase neutron di#raction and U-stage data. Tectonophysics, +,0, ,1+ῌ,2..
Wenk, H-R. and Pannetier, J., +33*, Texture development in deformed granodiorites from theSanta Rosa mylonite zone, southern California.
Jour. Struct. Geol., +,, +11ῌ+2..

¼ 68 ¼