ῒΐ  /+  (,**0) +  -+ῌ.* ῕ ῔῎ῒ῍῏ῌ K-Ar ῑῐ       ,**/  0  ,1  ,**0  +  +* K-Ar Dating of Kimpo Volcano, Northern Ryukyu Arc
Kiyoshi TOSHIDA῍, Kozo UTO῍῍ and Akikazu MATSUMOTO῍῍῍Kimpo volcano is a distinct volcano in central Kyushu, western Japan, and is located -* km west of the active
volcanic front of Ryukyu arc. In order to determine the growth history of the volcano, systematic K-Ar dating
has been performed.
The activity of Kimpo volcano has been divided into three stages. The oldest activity formed the andesitic
stratovolcano in the southern part (Older stage). Six ages are concentrated between +.-2 and +.+/ Ma. The
horseshoe shaped caldera was formed before the middle stage activity. The middle stage activity formed theandesitic volcano in the northern part (Sannotake-Ninotake). Ages between *./2 and *./* Ma are obtained fromsix samples. The youngest activity formed a dacite lava dome (Ichinotake), which is located within the calderaof the ﬁrst stage activity. Two samples gave consistent ages of *., Ma.
The total duration of the volcanism at Kimpo volcano exceeds one million years. However, long periods ofrepose existed between each active stage : about 0**,*** years between the ﬁrst and the second stages, and about-**,*** years between the second and the third stages. These inactive periods are much longer than the durationsof volcanic activities of each stage. It is therefore important to determine the duration of each active and inactive
period of the volcanoes that have longer than a few thousand years of growth history.
Key words : Kimpo volcano, K-Ar dating, Ryukyu arc, Quaternary, long term eruption rate+ῌ ῐ ῎ ῑ ῏y#`z`- ( {< | +33,D }q] E ' !"# $%&'()*(xr8 !"5-HI'(U~'(m6

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?C Takai et al. (+32.) .e0 1p#qrs^abcdto)uv# E '(!"(FT) JT!2@J

6no -** kmp# w_xr86nW2,1*ῌ++3. ¡¢£N¡¢£ +0.0¤¥K¦§¨© ª§¨©«¬­
Geosphere Science Sector, CRIEPI, +0.0 Abiko,
Abiko-shi, Chiba ,1*ῌ++3., Japan.
 -*/ῌ2/02 ®¯°z±N² +ῌ+ῌ+ z±K¦,³´µ¶·¸§¨©¹ºPlanning Headquarters, AIST, Tsukuba Central ,, +ῌ+ῌ+Umezono, Tsukuba-shi, Ibaraki -*/ῌ2/02, Japan.

  +** s^+/ 6 2* L6Q-JqD }_2-*/ῌ2/01 ®¯°z±N7 +ῌ+ῌ+ z±K¦ 1³´µ¶·¸§¨© »¼§¨Institute of Geology and Geoinformation, Geological
Survey of Japan, AIST, Tsukuba Central 1, +ῌ+ῌ+Higashi, Tsukuba-shi, Ibaraki -*/ῌ2/01, Japan.
Corresponding author : Kiyoshi Toshidae-mail : toshida@criepi.denken.or.jp

P¹xºb»y¼WbGzP

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12.#/  |.' WQRb,QR @¸ WQRb,QR#  AQJ῎ῒ῍῏ῌ K-Ar ῑῐ

33

Fig. +. Topography and geologic map of Kimpo volcano. (a) Location of Kimpo volcano in Kyushu. (b)Bird’s eye view of Kimpo volcano with the dip angle of ,/ degrees. Vertical enlargement ratio is , : +. (c)Geologic map of Kimpo volcano (after Hoshizumi et al., ,**.). K-Ar ages by mass fractionation correction
method are shown (average, in Ma). Contour line interval is +** m.

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6 f Micromass +,** 7

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¬­ª« K-Ar op

35

3>"#$3 (+.-2I*.*- Ma, +..*I*.*- Ma) Q3. 

 "#=T >P jk2]; .ῌ+:op (+.+0I*.*3 Ma) T

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bL3 -2 Arῌ -0

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2 $3 234 b$3

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Ar > !"#$3 5678'()*,¡X 2b¢£3M5678'(

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9/$ YZ }9/$ '()*

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'()*b , c9/$3 -  5678'()*<1T ! (,s) "#$3
.ῌ,  

/  !"#/ῌ+ $ %¨©ª«zdee  XRF b$3 ,  K, O
fg XRF >h1i1 *.0ῌ +.0ῌP\ (Table +  (KUM 23*-) ]; +.-3 I *.*-

Ma |:}{opbn3> ¨©ª«z| , ]; +.,*I*.*- Ma, +.+/I*.*- Ma, {¬­+)  ! (,s) "#$3

ª«z ]; +.,-I*.*- Ma, +.+0I*.*. Ma, ®¯«ª«

K-Ar 

z ]; +.,/I*.*- Ma  +.,/῍+.+/ Ma  +* oG.ῌ-

! (,s) "#°±} 9/ !"#=op>n;13 2=CDbn32]; K-Ar opT ! (,s) 

jk:W lmT

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tA $3>L ¬­ª«»¼~?

ky:W 9/ , AUV9/$+.* o./0136 
Table +.

K-Ar ages of Kimpo volcano.

st K-Ar 

37

"#$%

*(& )* OP

Takai et al. (+32.)  

- *.3.*.+/ Ma, +.+,*.,* Ma, +.*+*.*3 Ma

QTRPQUVW#X(Takai et al., +32.)

 FT   K-Ar )YZ:(& [ S $%:()0

 !"#$%& '( )*+* OPQTRPQG /* 56  \5JE]^K-Ar ,-./)0* 1234;J _)`($a34 78NKb(M#X++* 56789:;2'#<=:()>?@EF0* 1234G +.* 56

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$PQ0* *.,**.*0 Ma, *.,+*.*- Ma qr
G *., Ma #S $%:((& )* Takai

OPQ0* *./,*.*+ Ma, *./.*.*+ Ma,

et al. (+32.)  FT  !"#$%: UVW*./**.*+ Ma, RPQ0* *./.*.*1 Ma, *./0

#X )YZ:(& 7` $PQG ,* 56

*.*, Ma, *./,*.*+ Ma  G *./ Ma S  !

NKb(BC* OPQTRPQ34;2

Fig. ,. Three active stages of Kimpo volcano and comparison of K-Ar ages. K-Ar ages of this study are plottedby their measurement methods. Error bars represent + sigma for K-Ar ages and , sigmas for FT ages. The
radiometric ages are concentrated into three groups ; +..ῌ+.+ Ma (Older stage), *./ Ma (Middle stage ;Sannotake-Ninotake), and *., Ma (Younger stage ; Ichinotake).

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Imai, N., Terashima, S., Itoh, S. and Ando, A. (+33/) +33.
compilation of analytical data for minor and trace elements in seventeen GSJ Geochemical Reference Samples,“Igneous Rock Series”. Geostandard Newsletter, +3, +-/ῌ,+-.
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³´GU (+32-) I , ?µ9p4¶+-/ p.
T (+320) ¨©|`w.9 +  ,  -+ 3/ῌ++*.
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Nier, A. O. (+3/*) A redetermination of the relative abundances of the isotopes of carbon, nitrogen, oxygen, argon

¼ K-Ar $%and potassium. Phys. Rev., 11, 123ῌ13-.
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,2 p.
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78 +9 : (+32*) K-Ar $%&' ;<=>?@A B,C -+ ,01ῌ,1-.
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