十和田火山，噴火エピソードE及びG噴出物の放射性炭素年代
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(2) E G N . ½. ,**2 , 8 +2 9 ,**2 ++ 8 +. 9. Radiocarbon Ages of the Eruptive Products from the Eruptive Episodes E and G, Towada Volcano, Northeast Japan Takashi KUDO῍ Towada volcano is an active volcano located at the northern part of the Northeast Japan arc. I carried out AMS radiocarbon dating of two soil samples taken from directly below the tephra layers derived from the eruptive episodes E and G at Towada volcano. The obtained +.C ages were 2++*-* BP (PLD-23+-) for the eruptive episode E (Nambu Pumice) and 331*-/ BP (PLD-23+.) for the eruptive episode G (Shingo Pumice). On the basis of the calibrated +.C ages and the stratigraphic relations, the most suitable ages of eruptive episodes E, F, G and Ninokura Scoria were estimated to be approximately 3.,, +*.,, ++ and ++.1ῌ+/./ cal kyr BP, respectively. These results enabled more detailed and reliable chronology of eruptive history during the post-caldera stage of Towada volcano. Key words : Towada volcano, eruptive episode E, eruptive episode G, AMS +.C dating, eruptive history. +ῌ ῐ ῎ ῑ ῏. :;.<
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(13) 7. 194. 8. Fig. +. Topographic map of Towada volcano showing the sampling site for +.C dating. A part of + : ,/,*** topographic map “Heraidake” published by the Geographical Survey Institute is used. + +. C /0 %1 . !"# $%&' () *+ , / , + -.. 9:;:<=>
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(23) E Fig. ,. Geological columnar section at the sampling site. Numerals in rectangles are +.C date. Alphabets represent the name of eruptive episodes. Words in parentheses represent the name of eruptive units. , !"#$"%&' ()*+,-. / 01- +.C 2/ 34567
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(39) 4`51 (Hayakawa, +32/) 3. E5 E$$¡6K'(). Fig. -. Chronology of eruptive history during the post-caldera stage of Towada volcano. Ages : *, Machida et al. (+32+) and Hayakawa and Koyama (+332) ; **, Kudo and Sasaki (,**1) ; ***, Kudo et al. (,**-) ; ****, this paper ; *****, Horiuchi et al. (,**1). -
(40) : * (+32+) (+332) ; ** (,**1) ; *** (,**-) ; **** ; ***** Horiuchi et al. (,**1).. * ¢@ &'()*
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(44) +*., cal kyr BP E F, 3., cal. »`56^ ,**1 +/./ῌ++.1 cal kyr. kyr BP E E, 2., cal kyr BP E D, 1./ cal kyr BP E D῍ 0.+. BP E. -/* }c>¼6?#+,,¬\ l½/. cal kyr BP E C l7L1 7+. 1**ῌ+.**.
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(47) -/ BP =:!" >?:!"6@ *+ ,'- E F G (ABC6DE F G 678" HIJ K LMN ! O "#. !P ; H!Q!RH E : 3.,. cal kyr BP, F : +*., cal kyr BP, G : ++ cal kyr BP, (. ABC : ++.1ῌ+/./ cal kyr BP O8" >? Fig. .. Temporal variations of repose time before eruption during the post-caldera stage of Towada volcano. . . IJRS RS$T U%=V&OS '() '*+, WX=RS-Y8" > Z!:'[ 6@ '*+, \. ]^]/0_ O`a345bc61d e2f(0gOH_ 3h6i-F5 4j"4. 4,_kL ='*F5S (ABC O5lmO _k;-:6 F +,;. n7F54 - R/ . . op61dq"S rstuvwx.
(48). C ; 8 -.** _y"5l96. z{ :|;};<=~:>4"454. 6L ,.1 cal kyr BP B ='*F H. % .?;} @o ABC. 8 +1** _6LDE 3+/ A . F GH R/IJA; K>6GL. =Z8" - C O5lmO _k;. mMLNA64"4" ZZF5O. :6 F +,;n7F54R. PFMm. . . QR9WX6O ) { : (,**1) =S F"R OON _k=6 F ' *+,=]2mWX=^d:! . 7ON _: C 5; OON _k=` 6 F54 . C N _k ;6 F54N C-B _=f¤9 64"d H!Rij L;85 4 . Z!; C © e2f(0gª: =q8"ZO6«¬m C L;8 . km W ¡®¯'[' q4; =°0 !. "On !54 (Hayakawa, +32/) Z!=o]^ ]±²³´µ6p e2f(0g ¶6N":F "V&q=q FF >OZ·H3h6rm ;¸8544 > P *+,'-st 6DE F"ML '*+, \. ]^]/ 0_ `a345bc674 e2f(0gOH_ 3h 345i-F54j"4Ob54. T?U V (+32-) WX01YZ[ \ ,/0 ,2 ,0-ῌ,1-. Hayakawa, Y. (+32/) Pyroclastic geology of Towada volcano. Bull. Earthq. Res. Inst. 0*, /*1ῌ/3,. T?U V abc (+332) =K¡6; L +* d e¢4LZ8"3H £=# Ogh .- .*-ῌ.*1. k¢l ¥?¦§ (+300) +*** f(¨m' !"#
(49) $%&'( no. +.* +*ῌ ,2. Horiuchi, K., Sonoda, S., Matsuzaki, H. and Ohyama, M. (,**1) Radiocarbon analysis of tree rings from a +/./-cal kyr BP pyroclastically buried forest : a pilot study. Radiocarbon, .3, ++,-ῌ++-,. Hunter, A.G. and Blake, S. (+33/) Petrogenetic evolution of a transitional tholeiitic calc-alkaline series : Towada volcano, Japan. Jour. Petrol., -0, +/13ῌ0*/. ) { :| (,**1) su¹v, U%
(50) º ++0 0/-ῌ00-. ) B C WwxV (,**-) yz» ¼ M½ 0*** _ e2U
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(55) ! (+320) ( 0* 689 < , 6R ῌ 6 89 8 9 ¡ 2.p. &'() ¨©ª (+31.) b %2 +. C 1<=>? +.C (30) 6@AB ,2 33ῌ+**.. 199. &'() *+ , (+31*) -./0 C 1 <=>? +.C ῍ (0,) 6@AB ,. ,-,ῌ ,--. Reimer, P. J., Baillie, M.G.L., Bard, E., Bayliss, A., Beck, J.W., Bertrand, C. J.H., Blackwell, P.G., Buck, C.E., Burr, G.S., Cutler, K.B., Damon, P.E., Edwards, R.L., Fairbanks, R.G., Friedrich, M., Guilderson, T.P., Hogg, A.G., Hughen, K.A., Kromer, B., McCormac, F.G., Manning, S.W., Ramsey, C.B., Reimer, R.W., Remmele, S., Southon, J.R., Stuiver, M., Talamo, S., Taylor, F.W., van der Plicht, J. and Weyhenmeyer, C.E. (,**.) IntCal *. terrestrial radiocarbon age calibration, ,0ῌ* ka BP. Radiocarbon, .0, +*,3ῌ+*/2. Stuiver, M. and Polach, H.A. (+311) Discussion : reporting of +.C data. Radiocarbon, +3, -//ῌ-0-. Stuiver, M. and Reimer, P. J. (+33-) Extended +.C data base and revised CALIB -.* +.C age calibration program. Radiocarbon, -/, ,+/ῌ,-*. *() (+310) \¢£^¤¥$¦%§ «¬ ®¯6°±²5\³´p }j~µB¶ · no. +/ +.ῌ+3. +.. ¸¹º »¼½.
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