熱ルミネッセンス法による新期雲仙溶岩ドームの年代測定−妙見岳火山以降2万5千年の噴火活動史−

全文

(1) .3 (,**.) , 1-ῌ2+ . .

(2) ! , " / #$%&'. .

(3) . ,**- , +- ,**. - - . Thermoluminescence Dating of the Latest Lava Domes at Unzen Volcano, NW Kyushu, Japan Eruption History of the Past ,/,*** Years after Myokendake Volcano Takehiko YAMAGATA, Isao TAKASHIMA, Koichiro WATANABE and Eiji IZAWA Thermoluminescence (TL) ages are obtained for ,2 samples from domes and debris avalanche deposit of Younger Unzen Volcano. Weighted mean ages are ..+*.2 ka for Tenguyama lava, -.2*.0 ka for Shichimenzan lava, -.+*.0 ka for Fugendake-sancho lava, -..*.0 ka for Kazaana lava, +/, ka for Myokendake lava, ,/. ka for Kunimidake lava. Six TL ages for Tarukidaichi debris avalanche deposit range from ,*, ka to -*- ka. We success to distinguish individual dome age by TL dating. Source rock of Tarukidaichi debris avalanche deposit is Kunimidake lava and age range of formation is estimated as ,/ ka to 1.cal ka by TL dating and field observation. We gave new and useful age data of Younger Unzen Volcanic lavas by TL dating with age range about ,/ ka to - ka. Key words : Unzen volcano, thermoluminescence dating, Myoken caldera, devris avalanche deposit, collapsed age. + . bc +33/J K"d ! efge>. ! +33* ++ "#$%&'()*+. XG"hHi1j klm

(4) nm . ,-./0 +330 0 123+4567- 1 8. m1 - op>YX7J. 9:;%<+=*> =?"@+ABC=D%E. _à1!qrs" ST"t+uvIC. F+G/HIC/J K" 23"LM N"/O"P. YX7+ dw (+331) +x>/yz%{f" N. QNRRG1 ST"UV1WXYGZ [%\. 1W SR S|f"}~g 6. ]+^BC _àR>Y-ROHCYX7. 7/O1! t"s+-pR!X%XJ. 2+,ῌ2/2+ o 0ῌ+*ῌ+ DD_ ¡¢£ Earth Resources Engineering, Master Course of Graduate School of Engineering, Kyushu University, 0ῌ+*ῌ+, Hakozaki, Higashi-ku, Fukuoka-shi 2+,ῌ 2/2+, Japan. ¤¥¦ : ,0*ῌ*2,0 §döe©ª + «¬®¯ °±¥ Present address : Research Laboratory, Kawatetsu Mining Corporation, +, Niihama-cho, Chuo-ku, Chiba-shi ,0*ῌ*2,0, Japan. *+*ῌ2/*, ²w³´µª +ῌ+ ²wD¶·¸ ¡¹º Research Institute of Materials and Resources, Faculty of Engineering and Resource Science, Akita University, +ῌ+, Tegatagakuen-cho, Akita-shi *+*ῌ. 2/*,, Japan. 2+,ῌ2/2+ o 0ῌ+*ῌ+ DD_ ¡¶ Department of Earth Resources Engineering, Graduate School of Engineering, Kyushu University, 0ῌ+*ῌ+, Hakozaki, Higashi-ku, Fukuoka-shi 2+,ῌ2/2+, Japan. 2+,ῌ2/2+ o 0ῌ+*ῌ+ DD_ ¡ ¶»¼ Professor of Emeritus, Department of Earth Resources Engineering, Graduate School of Engineering, Kyushu University, 0ῌ+*ῌ+, Hakozaki, Higashi-ku, Fukuoka-shi 2+,ῌ2/2+, Japan. Corresponding author : Takehiko Yamagata e-mail : [email protected].

(5) ῏¹º&9

(6) º&»l῍&¼»L¼. 74.

(7) . ,* km, ,/ km 'i(R ; X . . 8 M(8;῍

(8) +' *k.

(9) . +313, R ]^ PM;. !"#$%&'(") *+& +33-, -. yῌ{Hi +** km ^B8M. . /01"2%3 *45. G; _ P G {HB;. TL 678, *9

(10) & +33+ ; Takashima and. ':f VWpRR ;. Watanabe, +33., :; <=:;. * +32.,. TL > ?@A-BC. D !" EF#GH IJ *Aitken, +32/ ;. 9 SPBC #@ _6 r| )BC +. $%&&K +322, -'()= *LMNO. M qD^8 _6{HB; . P ( +, MQG;-6R ./S. ',(-*A R EF:; *k. D TU0S ; *&K&$% +322 ;. +3-0 ; Hoshizumi et al., +333 ; +32. , . Takashima, +32/ ; Takashima and Watanabe, +33. ,. *], * ¡¢¡'6 ;X. TL VW 6XY912 MQG;. 6p:J _£ H5¤¥9t_B6XYplP. 3Z B [4B56&78= D M. ^f ;. =\; ]^ = 9_:;M<=R^. y. @_ /* T {H +* RT . >? (Takashima et al., ,**,) 6*L@ÀB 1Ca. _ +* T qJpj6Qn *&op +33/, S. *

(11) D& +333, =EFG H6bc dIMJV. ; RT 4 _ y ¦t. R +*ῌ 45 bc= MQG;X6eK6Bf. ¡(= B BI X \y +00- @. ^ LMH EFg/h= 'i . ¢ \0 +13, ¢ \0

(12) R +33*. &jNO TL M ,** k4HR. qJ£]f^y6 ;.

(13) lP mQnR ; *

(14) D& +333 ; 9

(15) &. § TL ',¤ *&. +33+ ; Takashima and Watanabe, +33., TL . op +33/, M¨©¥R^ ', ª¦ ©¥. TU RS ῍RT. Uo= pEF=\. 8_§ ¨&« TL *ucv'B. ; +.C Qn6pqVrGMWR XsGJ. O. Uo, M Fig. + WR^ 45. YS ; *9

(16) +33/,. C !8; TL Z. +.. [ \0t] I :]S^;eKG :. ©¥Mf^_6,&©¥8 [4 ©¬;. ;P (= BD-_Mà=\;X. +) r| ,Mª68;Iq

(17) `. 6=:J bcu v+de= _

(18) p. . km _=:J ^` +./ km «®'. MQG ; *9

(19) +333, X qw TL. }MX8; k r|&¯|BC{HB;ª. *LMNO_ <fg!"6whi. _6-(8;¬jNOlk. :; xS^y :z l=:; + T. jNO{H°sS; k῎= ±(² . qJjM=\;. ®¯M°?R '}Mp6± (M. kEF= RS {H , T l26mnS ^ *&op +33/, q8;.

(20) ³r|r| ]¯|6´µX 68; (Fig. +). * ¶p*῍ ¡¢. r|M}s8; TL. ¡'=:; ²·= ¸³=:f^ r|. MQG^ ]^ ~t9t=:fûcv'. M . k ¯|M 0 k©¥R^. BO TL MQG t6mnS;. ,) ´R N-{H°s. _ wxy X z{q; O|<rp}R. S

(21) \08 r| «®µ ¶=B. O ~t_M~R^

(22) R XH TU. D «®µ p[WR ; r| «®'}. {H , T / S 4 'i y. ¶\0R^ - *·¹ ¸. ῎Mf^.

(23) , ,aA|s£qD ^* ¡¢¡'{HB; = . ,

(24). P u

(25) +

(26) P 8R yq;\0O o )pNG . ¸= - k ·¹= , k M©¥R^ -) =p88; . 88;688;. , .

(27) .º®»¯c!$yO¼ |g. 75. Fig. +. Geology and sample locations of TL dating with weighted mean and range of TL ages of 0 lava units and one debris avalanche deposit (Geology is simplified from Watanabe and Hoshizumi, +33/). I : Pyroclastic flow and fan deposits of Younger Unzen Volcano, II : Heisei Lava, III : Shin’yake Lava, IV : Shichimenzan and Tenguyama Lavas, V : Fugendake-sancho, Kazaana, Shimanomine, Senbongi, Inaoyama and Taruki-Higashi Lavas, VI : Tarukidaichi Debris Avalanche Deposit, VII : Myokendake Volcano Main Volcanic Edifice (m : Myokendake Lava ; k : Kunimidake Lava), VIII : Nodake and Fukkoshi Lavas, IX : Older Unzen Volcano S : Shichimenzan, T : Tenguyama, Ta : Tarukidaichi, Ka : Kazaana, F : Fugendake, K : Kunimidake, M : Myokendake.

(28) . 7 31 1 ;<=. ! ". > ! .3 '.OP. #$%&'())$*+,-.. 456,7 356: . / / 01 2 , 034. ) TL |g4H)- Table + $l,7. 56,7 "$1 89:89:;<=>

(29) . -ῌ ῎ ῍ ΐ ῔. 0 03456,7 => ? 7@

(30) . -ῌ+. $A cm

(31) /* cm BC(D'E. TL |g!~XyV$hi7 3 /** g 4c. TL ῒῐ῏ῑ῔. F$GH-IJ1 3KL,7 , : +/M. ]c"##4.yV,-$?,1. ,* cm

(32) NOP 4QR$S - 0TU,7. ,* (*.2. mm) .4. 1 => 4VWX$Y. 3

(33) ,3* g 4$&. ,ῌ- cm . %. 7 . ,1 'N 2* mm, x. .*. Z[\]^_'à 7 ]^_b_. mm _c($1 ) w¡¢£4h. c $d.- ,*

(34) efg4hi7)j1 +./*2ῌ. V g ¤c¥¦§ *3),7 ¨J ,+* g. +./+- k4l,7)

(35) 1 mnopq rsO. 4. t1 +312u vw'x. $yJ1 89:;. ,1 0*M,** (*.,/M*.*1. mm) 4T+,. <=> z{|'} . 7 $?3m«¬®¯° ± $yJ. ~z1 ,2 03$d.-1 TL |g4hi. ' 0* .4%©Hª$?. \² 4,,1 ³´µ¶-·¢´$yJ¸·1 ¹.

(36) l#$ l ¡¢l£¤

(37) ¥. 76 Table +.. Locations and TL age data of ,2 samples collected from Younger Unzen Volcano..

(38) . Takashima and Watanabe (+33.) !". #$ (+33/) %&'(. :,+Rf ghi4j k#$lKm +323n )F4 (Annual dose, AD) :,+Rf. TL )* +, (+) -./*01234. o 23ABC (U, Th, K, O) !"Zpqr r. 5+, (,) 67 TL 89 :. s tfGH 23ABC uv ,3*g. ,+, ;<= g 4&3>? @ . g 4ew^xyzx{]j . (-) 23ABC DE :,)F4 GH >I. o (U, Th, K, O) DE . - JK=LMNOPQR+. +*/Y Q|}~+Q'> . ST (+), (,) UV. W(X. `X:, W(X `X. Zpqr. Aitken (+32/) !" Bell. -/*Y Z[ \]^_9`X N-./*01. (+313) ]J)F4 H . 234 (Paleodose, PD) N:,X(+ abcd]e. qC+ Q

(39) .

(40) dy¹ºxD

(41) »¶¼¤q=)*. 77. +* mm

(42) . Ti ,H TL = TE 5| Ni si $,H. a

(43) . =US& NiP(Ti/si), #&

(44) .

(45) . )* H !USo;T ,.

(46) ! " b #$% &' ( (+333) $ )* $+& , !-. 3 !p >= I56JUS$ , s & ,qrstu v4]. !. CCD ./0$"#&$12%3$ 45. wq , >=qx 0 3. 678& '(9$)*& :; 3<. DEST

(47) US$% ¡¢y&=$. +=

(48) >=,

(49) $-*

(50) ?. n Mz I56J={£¤|q -.+Q. ./0 @AB +3/1C DEF

(51) $G?. *.0 ka M¥ =q ,/Q. ka TE. :& ,H912

(52) 34D

(53) I56J9. }¦ =§¨40>=~. (+313) DE+=

(54) 7 b 8.

(55) =& ©=ox %. $ Mejdahl. K82 ? '$L9&. ªV «¬/$h. M:; N<0<O TL =$G? TLage@kaCP. .ῌ, . TL =$)*&,3 ®¯]. PD ῌ ῍ ῍῎ +Q῔ ῑ ῒῐ ῏ AD ῍.

(56) rstu v4]°±¯

(57) ²Z. s >?R@A$S TE d ' US T

(58) V B1)* CWX./*Y ,**Yῌ D WZ EF[G\] HI^_7`Jabcd .ef1KLMg$ hO N1O? //*ῐ 0/* nm T

(59) g PQRSTijiUVW. kXlYQ 0*Co (/.+*m+*+, Bq) $ YQZn. T

(60) 3- X ^D

(61) ³~]p ´ª$hO X ^,3 TL )*. !>= + X0 $. & hO p9 ~] è_a0 b_ ? µ¶ · TE 1;o[ $ . ¸& Table , n& ,3T

(62) è_a0b_(µ¶(·[. Fo[)* 10 m 10 mm NaI p9q @r1s @tCC udvvwxydcz0b{$\|})Z. hO -ῌ,. X . !X~]*? X ^$hO. !. /_`$ a&%ab (-* mm) & %abc ,g $cdJ. !^d E d. DE?*&$)*& e&"f .iKgJ RINT,+** )*h Target : Cu @Ni d8C K : .* kV, Ki : .* mA, jk\ : ,ῐ0*, jl

(63) : .ῌ T

(64) .

(65) .ῌ+. TL . += =m$ Table + n , !>=+= =mI56J (TOWM) :US (sOWM) $N<0DEG? =K8& TOWMP. ῌ ΐNi*Ti ΐ ῎῏. sOWNPTOWM*. ῌ ῕ ΐ ῎῏. Table ,. Mineral assembly of Younger Unzen Volcanic rocks identified by X-ray di#raction..

(66) Bz{|¹V º*+»'}¼~. 78. X

(67) . m0 $"#(b<0 P,^mL / A ,1 B.

(68) . R )noC 345 6m01 Fig. , . . ! "# $%& '. "#$()*+,-./0. * pDJmL 9 X

(69) Z[=>?@

(70) D. 11( 2345 6 7. E/$%qH8 5rOEFsL(. 8 9*( : ;< =>?@A. 2/ t10:uv>,Gb. BCB( ! 1 TL "#A (

(71) DE/$%. FGH8 I&'(JK./L 9/M(N. / . . /ῌ+

(72) . 1CB(FGH8. H(N Iwx#y10z7Jm1 {|}. *O) P*+,Q +33/R STUV- W. t10KL~"# "#M(%. .CB/X P0110 +322R *1Y2(8. 0)n'Nb 9* LlO-mL. 29 Z[

(73) D. (Table +). P=>A 2/A8'. E/$%=>\]L. Qb 9*( A/01 lO"#. ^_=> *

(74) DE/$% 13àb!5 c d4 %. =*b {|}"#*1s mm .; lO , s *m01. 5e6f0g 7$*h"#. BCBRB t10 . %+1 7ij89: :. S /.++./ ka PT +33-R (8 TL "#. ;Jb( <=6 !(hk l>?@*. -.2*.0 ka SS1( vs/)n8 8 UCBSV W t10 0, ka PT +33-R *1Y"#( (N./01 ( 8 TL "#X?@ 1 '

(75) X UBY ( -.+*.0 ka Z ( -..*.0 ka *]L9*A B%L - t()n8x# [mL9*(\A*. ]L g z719/AY B t 10 Takashima and Watanabe (+33.) ( TL "#*m 0 ,.1ῌ-.. ka (Nm01 mm 9?@V ]. (+333) (NmL b ^_(à8]L. 9*A

(76) (N"#*! 1( b* m0SSc]01 g Takashima and Watanabe (+33.) U *m0 * ""#Jm01 . dxef./01]LO XM8

(77) X?@*= 1 ML % /g"#*'Nb *1Y ?h8. ( 2¡1¢ TL "#(k]01 TL S i>j(7k8 ( £¤X¥S q ¦b i¦*m0vsA/ §x ¨© ªk« $%xlSm¬ | V®¯8 <dn°o]0±²p0 1 ( 9/A9* ³qm´/A1 l>rs8. BCB UCB {|}µ"# z¶M C«t$%1 +. C "#X ./01 Fig. ,. Photomicrographs of lavas from a) Myokendake lava (SB-**1), b) Kunimidake lava (SB-*+-).. L ·u10 (+33+) U {|}qHv wC«t$% +.C "# /.,*.+ cal ka Px¸Ay.

(78) ¸¹º»¼S!jB#34 5%. 79. .,**+** yBP

(79) . Table + . K, O %lm7jL SB-*./A, B, C %. Stuiver et al. (+332) . - {^ jB#'!n3gW% SiO,-K,O. (+320) . ! " #$

(80). %o LEF;^ +33/ ?@+p! SiO, ,L. % +.C /.,*.+ cal ka &'( )%*+,. qr 6%O 12. -% TL ./! 0& TL . ),CW@! 6%S2L SiO, 3\% . %/1%234 56%,%%./!). & 8TX#[st#$

(81) LSiO,/2.1. wt. 7./!. ῌ ; K, O+.2. wtῌ ; EF;^ +33/ 7%[8. #% , 8%3%98 :;%). &@! )%O%%

(82) i2. <./( =>% TL *+?@,AB C. %. )V%uyr27 =`%vw. DE F!./! GC"#%HI2!7. ./!. J$K% L&M' , ()% + %NO P* +,.-. V%*+S( P QC3u20

(83) YTX. .%%/0"#7Q 1.72.%3R. L6%3%x%V67,/!7 )`. 4@!ST@!)?@ %57U. yYTXz-! %UvXi &

(84) . V677CW@!. %V677Qqr! Z-o& YT. 8TX YTX8 8TXZ#&[ \ ,2, ka, ,/+* ka, +*-2 ka K-Ar . XgA%e2!8TX %3\71 2)7@!. 97:]! L;^< +33. AB%=_`. P QC wW!3u20

(85) $%3\7YT. %

(86) >9 TL %YTX3 L3 %. X3 @8TX3%2) P. 9 ,/. ka ab[?! &?& 8TXZ#. QC%wW8TN O%wWW{#%V. %c8TX3 +/, ka YTX3 L3 . .7Uv&.o!|$$| (+322) %} ¡. de2! TL f&'( 3@gA. ! )%W{#=>% TL *+?@. hiCW@! YTX38TX3. YTXCW@! Fig. - G%J$K%?@,¢. jB#CkD LEF;^ +33/ .,[\'. £iUv~%w./! )%D?@ 8TN O. ( lm%:Cn.,E .o2?i &?& . %Uv~7-.%YTX2.%8TX) ?. G%NO J$K%%HI.-.%YTX3%57. 88TXS7YTXS 4i!)7,¢£!. H7I /07Jp.!Sqr )%B. 1 YTX-.UUv~%;,d@!. YTX%-K7LsMQ#1.t7i!)S. YTX%Uv% 2!YTX3% TL. !V67,/!7 3E %NO2!?,&2. (,/. ka) Uv

(87) ¤N¥¦#§. /ῌ,

(88) . L0-** 1.- cal ka %¨./!. P QC3u20

(89) %RS)T!U v

(90) .P QC%V wW! )%

(91) 8. 0 , / !"#. TX#%UvXi &3u20

(92) . jB#C©%ª«%gA8 R (+32,),. Y,%% Z!1.xi. EF;^ (+33/), Hoshizumi et al. (+333) 2¬ =. 2. %®72! Hoshizumi et al. (+333) _. =>yi TL S( 8TX#[!. %Ck

(93) S(U¯°jB#%gA. YTXP QC3u20

(94) $%3\%7?. ± ²&! 6%

(95) s 8TX#. 2(z9 f&! G%]\HI. P QC. wW³%Z2#gA± Fig. . %´S%f. 3u20

(96) $%3\ L, C 0 {^ -, _%HI*. & =>297@). 8?%. + 8TX3 %3\%Z`./!|ab}j. µ7¶! LFig. . ·S% .G,. c%~7d@2) X e>fS. 1!. !gW (Table ,) ?@,YTX3P QC3u. (+). )1.[\8TXZ# . 20

(97) %h77Y.o! X e>fS!. YTX3 L3 ,/. ka 8TX3 L3. %ij. P QC3u20

(98) %[.%{^. +/, ka d)!. .O7k&! )%) P. QC3u20

(99) 7YTX3.2 %3 %3\ ,p.!) fV67,/!. (,). P QC3u20

(100) %. 3%V677Q 8TX3 . kYTX. %,% 12.

(101) 8°±²³´ µ²¶·¸²¹º»¼. 80 (-).

(102) . ,. !" #. vB)+ :;ÀB vB E4*. $%&'()* (.). +, # -). ῍. ῌ. ./ ,/0. ka 12 . 567.89ZB 'I vB . 3 4567.89 :; 1.- cal ka < =*. ¡¢¡¢£¤¥¦§&¨)©ª)f'* «¬®¯. >1> (!? @;ABCDEF>GH' I Fig. . 8$%12<J@=3K1 L#>'>GMN>GH* (/). O #./ +/0. , ka 12#P)Q>'RS8T UCVW. :; -ῌ0 ka < XYZ

(103) Fig. . 8$%12<J@=3K1L#>' >GMN>GH* (0). $%/ [\.8]^ UCV. _ TL :;` RS8T -.+0*.0 ka a. -..0*.0 ka b8.8 cd8 ..+0*.0 ka e 8 -.20*.0 ka f'* (2 :;`gh i )jkll]>H mnW op12q)r sBtH* !" u vBwx12gh :; yz{3|B p3<I'* u/ }~ H1) :;) CD31* i TL H: ; )* ( 'I) . Fig. -. Shape of collapsed walls at Myoken caldera. Abbreviations of location names are same as Fig. +.. q vB mnH)HG -. Fig. .. History of Unzen Volcano in recent ,/,*** years and new proposal derived from TL age data. f* : fission-track age by Danhara et al. (+33-), k* : K-Ar age by Hoshizumi et al. (+333), k** : K-Ar age by Hoshizumi et al. (+33.). Kikai-Ah and Aira-Tn ashes are widespread tephra derived from South Kyushu, and the ages are widely accepted..

(104) >op`qr?

(105) uvJ|g6\] W²³´2345

(106)

(107)

(108) .

(109) 0* Co !"#$%&'()*. +,-. /01234

(110) 56 7)89 :;<=> ?@ABCD !EFG"# , #H$IJK )L%&MN OP',

(111) QR*( )PSTU ῌ῏῎῍ Aitken, M. J. (+32/) Thermoluminescence dating. Academic Press, -/3 p. Bell, W. T. (+313) Thermoluminescence dating : radiation dose-rate data. Archaeometry, ,+, ,.-ῌ,./. *V +#W,XY#-ZX.#/0/1 (+33-) [ \]W^_àb#c`d23455efg 6\]#7]8f \]hi h9j: /+. :klm#n;<= (+322) >op`qr? s@X AB2?t

(112) uv\]w2345 C: ,3, ,*1ῌ,+0. DxEFG (+3-0) g6y \] H + : -, 1ῌ+,.. -ZX. # zI{m # /0/1 (+33.) g6\] K-Ar 2345fJ|g6\]KL}f \]h i h9j: 3-. Hoshizumi, H., Uto, K. and Watanabe, K. (+333) Geology and eruptive history of Unzen volcano, Shimabara Peninsula, Kyushu, SW Japan. J. Volcanol. Geotherm. Res., 23, 2+ῌ3.. n;<=#:klm (+322) >op`qr? C: ,3, 1-ῌ2,. MN.#~OP. (+320) g6\]} st \] -3, ,33ῌ-**. MN.#Q RS (+33+) g6\] \T#W UVW +.C 23KL} \]hi h9 j: +.*. X Y#JZ. (+312) [cJK\ ^cf\]w H@A +1, +.-ῌ+0-. Dῌ. (+313)

(113) *v\]]^_

(114) Uvà C: +0, +,1ῌ+-3. Mejdahl, V. (+313) Thermoluminescence dating : beta-dose attenuation in quartz grains. Archaeometry, ,+, 0+ῌ1,.. 81. (+3/1) Wbcde

(115) Uvf f¡

(116) uvBg45hi&jf kl 0, /ῌ+-. Q RS (+331) \]\W\\m¢94 \] £¤£ ¥¦/n# §o ph +/2ῌ+12. qrsi (+32,) g6mtfuÿ#©Ny#vNy w} xª«h¬ -1, +-ῌ,3. = /S (+32.) g6\] xª« 32 p. yz {#y ®#/0¯/n#|XF (+333) \ ]W>op`qr2345}g°±fg6\ ]\TUVW b ~}j23f W 3., +*3ῌ++3. Stuiver, M., Reimer, P. J., Bard, E., Beck, J. W., Burr, G. S., Hughen, K. A., Kromer, B., McCormac, G., van der Plicht, J. and Spurk, M. (+332) INTCAL 32 radiocarbon age calibration, ,.,***ῌ* cal BP. Radiocarbon, .*, +*.+ῌ +*2-. Takashima, I. (+32/) Thermoluminescence dating of volcanic rocks and alteration minerals and their application to geothermal history. Bull. Geol. Surv. Japan, -0, -,+ῌ -00. y ® (+33/) >op`qr2345f

(117) @X

(118) uv\]W45

(119) f H@A -., ,*3ῌ,,*. y ® (+333) V\]E] W²³´> op`qr23 \] .., ,1/ῌ,11. y ®#Dµn (+323) y«h y\ TUVW K-Ar 23 TL 23¶ · 3/, 2*1ῌ2+0. y ®#/0¯/n (+33+) + 2u¸[\]W 23458g6\]7]Wc TL 23 \ ]hi h¹9j: -,. Takashima, I. and Watanabe, K. (+33.) Thermoluminescence age determination of lava flows/domes and collapsed materials at Unzen Volcano, SW Japan. Bull. Volcanol. Soc. Japan, -3, +ῌ+,. Takashima, I., Mori, Y. and Mukaikubo, A. (,**,) Standardization of thermoluminescence dating of volcanic rocks fProposal of grade check for reliable geological agef. Advance in ESR Application, +2, +03ῌ+1,.. Qº#Q RS (+322) g6\] yV\]»4B@A¼ +., +ῌ+*. /0/1#-ZX. (+33/) g6\] \] 2 HB s: Co t.

(120)