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. / 2 01Reinvestigation of Holocene Eruptive History of Yotei Volcano, Southwest Hokkaido, Japan
Shimpei UESAWA῍, Mitsuhiro NAKAGAWA῍ and Masamichi EGUSA῍
We carried out the geological and petrological investigations around the summit area of Yotei Volcano.
Four eruptive crater groups are recognized : Summit, Hinangoya, Niseko and Kitayama in ascending order.
They erupted six pyroclastic deposits (from S-0 to S-+ in ascending order) and ﬁve lava ﬂows. Lava e#usion
occurred from the Hinangoya, Niseko and Kitayama crater groups. These activities were mainly Strombolian.
Whole-rock chemistry of juvenile materials is distinct among four crater groups, indicating distinct magma system
has been active beneath di#erent craters. The radiocarbon age from unit S-, fallout deposit from the Kitayama
crater group was obtained as .*+* -* cal. yBP. On the basis of estimated accumulation rate of soil layers, thelatest (S-+) and S-. eruptions from Kitayama group are considered to have occurred in ,,/** yBP and /,***yBP, respectively. Eruptive deposits of Kitayama crater group do not show the evidence of interval more thanseveral thousand years between unit S-. and S-/. Thus, it could be concluded that the Kitayama group started
its activity from mid of Holocene. Eruptive volumes of each eruptive group except for the Summit crater group
range from *.+ to *.+2 km-. After the last magmatic eruption in ,./ ka, there are no evidences of eruptions fromthe Kitayama group, indicating that activity of the group has ﬁnished. However, considering newly revealed
eruption history of the summit area, it should be noted that next eruptive group with distinct magma system mightstart its activity from another crater.
Key words : Holocene, tephra, eruptive history, Yotei Volcano+ῌ ῐ ῎ ῑ ῏( 2 -.&34 56 K-Ps 78(9: +*,12* .*;+,<=0>(?-.&@(AByBP ; CD ,**. E78(+F  GH

A(IJ 

"#$%& ' +,232 m ()*+,-.& Figs. +, ,++,/1*RS +3/0 <;+,(TU4VWXYZ ,[(\]^ _P`Yabc^& d- e +323

1* cal. yBP ; K L ,**1 MN O(PQ+fg`*#h"i#-.&34XjZ k(L"l<m+f(n4o-.&@+fMN 2Z6@+fV(m+,(pqrstZ6 u L +310 <;+

(8#(vMN +*,,**,-;+,wx(yz{*|X Z k(A-}6 Z6`~c 3b5-Nbc6Q" K-Ps

i#4Z6yz{  W`;+,(}( +GH MM aN";+* : K-Ps ; +3* yBP (_PXYZu L +310 78(9:(I _P` /,3-*,(( +"Zc<`4~c

+2* yBP  L +31+ -.&4YZ6 3(

6_`kb5-" abc6;+,(}( +_-.~6kZc k(X1c+,<

3b5-(<RS +3/0 X ,(yz+{*|(`¡¢-.\ kbN(yz{4+,¢(! £¤"+, +`.~64ab ¥¦§"Q\¨+"©ª4(«#< d(m+,X¬­bc^,"$abc^& ¥¦§  ,**/ ZMZ`^ RS +3/0 `stZ6Q" ,["<®N ¯ (- K-Ps <m+, %°±+F² MN

l(+fT³` ´Nb ( +¨µ(¶& *0*῍*2+*  +*  2  !
Department of Natural History Science, Graduate
School of Science, Hokkaido University, N+* W2 ,Kita-ku, Sapporo *0*῍*2+*, Japan.
Corresponding author : Shimpei Uesawa
e-mail : s-uesawa@mail.sci.hokudai.ac.jp



52



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Fig. +. Locality map of Yotei Volcano. Localities ofactive volcanoes are after Japan Meteorological
Agency (,**/).

Fig. -.

Fig. ,. A view around the summit of Yotei Volcano
from NNW.

Locality map of sampling points and tephra sections of Yotei ejecta.

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53

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D*V,jWµ@,1.!F-C29z

pH/05&'.;: ¶ +323 "v)v2 ·2j¸¹ - [2/0jº6Wµ)aE^

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,9;z2;: > + zY8,/,,1*

54





Fig. .. Geomorphological map of Yotei Volcano in the study area. (a) : Fg : Fujimi scoria cone, Hg : Hangetsuko
scoria cone. /*,M : /*,m. peak lava. 0/*M : 0/*m. peak lava. Mi : Minami crater lava. (b) : SM-C : Summit
crater, HG-C : Hinangoya crater, NS-C : Niseko crater, KT-HF+C : Kitayama-Hirafu ﬁrst crater, KT-HF,C :Kitayama-Hirafu second crater, KT-HF-C : Kitayama-Hirafu third crater, KT-TKC : Kitakama-Takamine crater,
KT-+C : Kitayama ﬁrst crater, KT-,C : Kitayama second crater, KT--C : Kitayama third crater. a : lava land forma, b : lava land form b, g : lava land form g. Geographical map (+/,/***) for background is published by the
Geographical Survey Institute.

 

Fig. /.

55

Representative columnar sections of Yotei ejecta around the summit.

 !"#$%& #'(") + 

*+,-./01 ) , 234) - *5
1"*#"6789:; <.#" =>$?'@/ 

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67NOPQRS#" TUV234WNXYZ[\]^_ `ab c*-Yd67TUV234WN e fg3hi*67

jklm*67 nop*67*q

67]rs TUV[-t@e fg3hunvw
S-0S-+  WNX-t@e Uxyunvwz-{]|} i~$r01TUV ( $%&( TUVe
l B-Tm :  +32+ ]6 YZ] Fig. / - [\] Fig. 0 - `e<S]
Fig. 1 - '2 NOPQ-t@e e- f-i,c67 ¡[\234]fg[#"¢- '2 WNX£{ Xf<<£-¤¥@e¦£/ῌ+  i*67  i* SM-C #"6§f¨7$%& f-` ¡]

Fig. 0. Block diagram for stratigraphy of Yotei ejecta
around the summit.



56

Fig. 1.



Geological map of Yotei Volcano in the study area.

 S-0  

 Loc. +.*   !" #$%&'() S-0 *+,- SM-C . /01234,$56 78986:;<=>6?<>6@*5

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+ B 0+ A 9$ :;(< =

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r+s/ /tust.usv+9$

 B Kd-B : 0+ B / S-. 

0L /** m 0MEFGH S-. /C)D."  ;N$ w#/xyz{|}gHd12, 1S~* #6T"VW#$;=#6Xi9$ Figs. .b, 1b  2LNbcdefgH$(?$L" 3y hi EFGH %[S/! +* m 9

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"0L .** m0M;N$ w#5/ xyz{ , -

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4

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PQR{",N$

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/ῌ- 

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+9$ F+/ Kd-C \L +,*** m 

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L -** m 0)*F/(* +q

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! .* m +¢g£¤LM**k"#$ o#/F+(¥I¦N$k (J/F S-,  Ts EFGH S-, /C)D§+a¨©7" +ª«W*¬­ +S/KLRLM1

! /* m 9$ +s/t.us/tusv+9$U;3hi N1"/L+$ (+ Kd-C :®,= ¡/GH¯ ,N$ jI?$)­( S-,  Ts /§+KT-TKC, Fig. .b", !"#Ts : 

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M1 KT-TKC 1T Fig. 1b /bcdefg

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;¹s º»bhi]??$ U;

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

58
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()
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q0r B-Tm

f+,#-./&S## TL7,-./ S-+ #

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..1 cmῌky 4) S-+ #-.!@l#-./&PJ S-+ 4)xGH A7-./&,-./ S-+,-./ S-+ B - ]y KT--C, Fig. .b L7C

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#N@ S-+ #()*

1 cm #+OP QR$%& B-Tm 

P@a J ,-./ S-. # 3#05 +-+ H) <;=;#< >ststu,-./ S-, #23aAl / cm #PS(<4)

)*L7 TU#-./&"),-./ S-. /ῌ/ B-TmaAl /,*** yBP !@#C]4)'T)

?X/;#O{2]8 VPST 8

 *./ cm  +,-./ S-+ 8) ]#<;

!  S-+ S-, q0r S-. # - B#,-./BH
'G GLG *# S-, #C]!"P@'GHj1=@4)

&W SiO,  00.3  11.. wt. ῌ K,O  ..,  /.0 wt
ῌ TiO,  *.+3*./3 wtῌ 4) *#W*

1 

`XTH) B-Tm #WJY() Z[,-./ S-+S-0 #$%&8q0r<%GH ,**- aq &W#'T

Table , #\+a:[¡X#]<W Fig.

^#¢£ +**ῌ¤¥G4)

2 \+a ^#¦D§Dh¨( Cz= SiO,/..10*.,ῌ#©_<;u<u<41 ,-.

0 

/H#`ª#:[¡XWaP«Ab¬GW

<­®0105 +-3 ,-./ S-, {2]

¨(L SiO, ca¯WaPK7°¢l# def567)g  = L7 .,*+*-* cal. yBP¦D§Dh hNGI¨(±B#/²[³#i´µg^PA7 Table + *#jA ,-./ S-,  Ts WPb¬GHq1

,-./ S-, # C ]  567) !"#,#*lk¶PTJ]yL7#Cz=G0;+-./L7i´µg^'4G·lSz(¸mn¹Ga*@aLd * F#$%&`º]yCz= »op¼a)W½q

Table +. The radiocarbon age of charcoal from S-, tephra unit. Lat. : Latitude, Long. :Longitude, Lab. No. : Laboratory Number.

!"#$% &'()* +,-.

59

Fig. 2. Selected harker diagrams of whole-rock chemistry of tephra and lava samples from Yotei
Volcano. All data is normalized to +**ῌ. FeO* shows Fe,O- was recalculated as total FeO.

    S-0  P,O/Na,O   P,O/ Na,O   SiO,K,O /0  S-0 1233 K,O

@0A BCDEFG
WX Ni 3# Kd-AC 
Y S-/S-+`7a Ts ^129 7b SiO,  FeO* MgO hijUk WX 

^129 K,O A]^\STR0v #YHIJKz{fM\ |=M9 SiO,  tu\ KM

2 



2ῌ+ 

456789&'HI:;<0 =>?

JKLMNM?OPQRSTUVZ[Z\;<C]^\_KJ^8C #I +*** cC89HId

\

Y

Ue<fg

9lmRnm op^^qrs SiO,  tu\v]^0w2C J\KLxy0q LMK}~~/|0hijU^ACOQ{|STUV9`b ^0 Z[Z^AJK &':;<0 Z[Z^

\9A]^ S

=>=>^Z[Z

60

Table ,. Whole-rock chemistry of representative samples from Yotei
ejecta. ig. loss : loss on ignition, n.d. : no data.

  !"!#$%&'

2ῌ, ῍῏ῐῑῌ῎()*+ ,-./ S-0 0123()*+ Kd-A

4 56789: 5&;<=>: ?@ABC -CD()*+ Ni E&()*+ ,-./ S-/

FGHIJ8K$LMNOPGQRK$S T

S-+ Ts PUVWPPXL YK &'()*+

5&&'Z;5[\]K^ Fig. 0_`abcd=KQefghijPklm P,O/

nopqr . s()*+Ktu\!

!"!

v Na,O  w^-CD()*+x yefghijz ^{({|;56}H~y|\nou K,O  ()*+PqLq^ &'()*+T5& Z%

{({

J8pqP\!L  0123(

no %S^ !()*+KRn)*+PE&()*+  MgO qL|o?@||%  Q 

Na,O v P,O/  \! K,O vvnoPm]yySL W$mK()*+efghijK0123()*+ -CD()*+;5?@ |\!LWP]\ {({}H¡¢ t

L|

H¤¥¦uyr §¨{({yL|© ,-./ S-, P!no!\K£qrE&()*+

.,*** ?

,,/** ?© ,-./ S-+  ,L {({ªZ+«C¬Ks$%­®y¯°|± ;5²W^WP| \]PyS^ ~\K,

³L|  ´PyL WW-./ S-, ©noP ,-./ S-. |µyr

W! ¶ ·¸yP /,*** ?©noL|L ~\K,-./ S-- S-. ¹$º S-/ Kpqy»¼½

    61 !

"#$%&' ()*+,-./0123456785  #9:;-<=/>+ ?>@ABC)*+ E 

DFGH& IJ)*+ - K

GL012345

)*:;-<=/>+

 ?>M> G)D N)OP+BC#:QR;,- /.@!:; E   G
AST  )U;VW)*+  ,,/**  X

YZ[ S-+ #L;/\; D C  ]^@_/>"#C\QR+,-./ 6785

 )*:;-<=/>+
`abGH& C#c -d
ef#ghQij; ?

kl  `abG*.+* km- Hm ZnoG  *.+2 km- G)D ?>M> S-/  *.**1 km- S-.  *.**.
km- S--  *.***3 km- S-,  *.*+- km- Ts *.+* km- S-+ D *.***- km- ) *pqQ *.+- km- )*+ , ,-./ rG)DC s-tu
#BvjQR+,-@!+  G /***  X./wxN)IJ\;-yzP+- G CD *.*- km-ῌky H'-!+2ῌ- { 

D +*,*** X|@)},:;

 VW)*:;-<=/>QR; \.\ ~@ ,,/** X/@F VW  )* D!-L |./ +,*** @p; F# @ IJ#\QR;,- /.!:;

F

AS`abGH&)D rG) VEI.   #},\ B#N)'qQR+*+ @ VW G)*+ G  .,*** X  )DBDwx  EN)O\QR+|./IJ#\;-<=/>+G IJP+#<=+ , @D Fig. 3. SiO,-MgO, P,O/, and K,O diagrams of Yotei
ejecta. All data is normalized to +**ῌ. G. : group.

GD@ *.+ km- Hm

QR+ ) ?  DYZ[ S-+   a
!L )*A  G  ,,/** X 
+ KX

D .,*** X)* ?

+,/** )*+ P¢£!R,- ¤B¥¦§¨!©P+,-.
/  G  IJD|@\

B#C\



DV¡ ,,/** D\

QR!R,-./  G IJDª"\;-<=QLR.L\>!R \.\F)  #$

 +,*** @p;:Q«¬­@ \;-<=/>+

#<=+- ®!+¯¯° ]#%=Q& 

N; S-+ C m±@ ²Dj/>!R,G-\QIJP+,-#³zP+-./ V¡ ,,/**  A , @D  D012345 '¶­·D #},\QR!R,-L¸¹)U+
FG IJ@KRQD

.! )*+ ](@)CP+²´µ)*

URBC#R ?

º»D ] ±¼@:QD½N)OP+,-#

62  





)*+,  ,*+* 343%5678 9 1!:#@6 *((A)*678%J 3,*)JKL3%A)*J/4+%6
ST U;3ῌ ῎ ῍ ῏%^_#`,ab(M#@Q&96c3^_#$Qlm#9n3%

+

`76 B-Tm Uab
,

pqH6cxU dxy1efUgQ9:

Tz 3^_()U&9#-

qr]|F}~(ar l|F}~*ms6|Ut8Jwcx`UuS
U5Q.

(|F}~-.9()* 3*(rN8o!#d8 .,***  (*cxU`/

&(ar  ,,/** Q
ΐῒ

%^_US#+, #$Q (?+1(A?' ? dxy1ef4O$`
Htef4O#$Q11(%V#$.#c  (?+{^_

(U #3(pqH#@

QQU1Q ( ;¡ \%1 \ ¢{^ z(£ ¤¡ ¢{^ (u¥¦#`,%2§¢¨ #©Q ª«£¬I­}?#¤"®
¥(¯AU3  °}(A  lm?(±¦ § k#¨©(ª²UicQ $ %^_#(?+«¬^_­$`®£ $`^_­ (=,U³g a(´ $`I­I# ¸Q¹µ3ῐ ῕ ῔ ῑU » ¼P ,**1#$
%-.½( +.C J \% ½1  V+/0-P*,1.
#$%&' , ( !" ,**.
). /012 p. ++3ῌ+,*.
#$ >%&' ,**2 (?
";<=
+B, C-.(/0DE"FGH(126I
M567 : N8M5676OP"FGH(9R ++. -.2ῌ-0/.
:6Q
"<=V>  ?@> WA B C?0' X
YX D E
> ,**- FG( +* .0#$%Z([HI AMS +.C JK  L\]
1dNe
4OfgPQhR XIV /2ῌ0/.
Si T>UVWjXYZ k=[\;]
o=> +310
(pqHrbs"tu
v5676w( +.C J#@Q /0^_+/ , 1/ῌ20.
(6x" / 4( +0;{h +3/0
ijk&R lm n (?+Lop +ῌ+..
 ,*+*  ++/  d()(v  Q+owx +*p.
yp z ,**/ \%){  - | 0-/p.
}~ -;> ,**- -zvHt\%6w(^_ 1`| +1*p.
> +32+ \%?UcQ}~ -;>EpqH 1 /+ /0,ῌ/03.
]ah +32- \%(  1`|+-/p.
Ramsey C.B. (+33/) Radiocarbon calibration and analysisof stratigraphy : the OxCal Program. Radiocarbon, -1,.,/ῌ.-*.
Ramsey C.B. (,**+) Development of the Radiocarbon
Program OxCal. Radiocarbon, .-, -//ῌ-0-.
Ramsey C.B., van der Plicht J. and Weninger B. (,**+)‘Wiggle Matching’ radiocarbon dates. Radiocarbon, .-,-2+ῌ-23.
Reimer, P. J., Baille, 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., Guildersonm T.P.,
Hogg, A.G., Hughen, K.A., Kromer, B., McCormack,
F.G., Manning, S., 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.
*ῌ,0 cal kyrBP, Radiocarbon, .0, +*,3ῌ+*/2.
´ C¯µ °¶·´ C±=²³X
~ ¶²A{¡(·¯ +31+ (?+#
$%¸¹ (z#I3%^_ /0^
_ +* ++1ῌ+,-.
ºA !" +323 pqH9»() \%1 +323 º¼2 p. ++*.
z £ ¤¡
ῌ  ῍  !"# Table

A+ $%&'(Table A+. Modal compositions of phenocrysts minerals for the representative samples of eachejecta. Abbreviations. Pl : plagioclase ; Opx : orthopyroxene ; Cpx : clinopyroxene ; Ol :olivine ; Opq : opaque mineral ; In : intersertal texture ; Hy : hyaloophitic texture.

63