鹿児島県口永良部島火山最近約3万年間の噴火活動
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(4) ++ ,+ . Volcanic Activities of Kuchinoerabujima Volcano within the Last -*,*** Years Nobuo GESHI῍ and Tetsuo KOBAYASHI῍῍ Volcanic history of Kuchinoerabujima Volcano in the last -*,*** years is reconstructed based on tephra stratigraphy. Kuchinoerabujima is a volcanic island which is a cluster of at least nine volcanic edifices ; Gokyo, Jyogahana, Ban-yagamine, Takadomori, Noike, Kashimine, Hachikubo, Furutake and Shintake. Eruptions within the last -*,*** years occurred from Noike, Hachikubo, Furutake and Shintake volcanoes. Two major pumice and scoria eruptions occurred between +/ and ++ ka after an inactive period since ca. -* ka. NoikeYumugi tephra (+/ῌ+. ka, DRE*.*0 km-), erupted from the summit of Noike Volcano, consists of Yumugi pumice fall deposit and Nemachi pyroclastic flow deposit. Furutake-Megasaki tephra (+,ῌ++ ka, DRE ca. *.2 km-) erupted from Furutake Volcano and consists of Furutake agglutinate, Furutake scoria flow deposit and Megasaki scoria fall deposits. Volcanic edifice of Older Furutake was built during the +,ῌ++ ka eruption. Eruption style changed around +* ka, after the collapse of Older Furutake Volcano. Activities of Yougner Furutake and Shintake Volcanoes are characterized with e#usion of lava flow and no major pumice eruption is recognized. Lithic tephra erupted from Younger Furutake and Shitake Volcanoes within the last +*,*** indicates repetitive Vulcanian-type and phreatomagmatic eruptions. All historical eruptions since +2.+ occurred at and around Shintake crater and were Vulcanian-type explosions with emission of magmatic materials and phreatic explosions. Key words : Kuchinoerabujima, eruption, tephra, Vulcanian eruption, phreatomagmatic explosion, pyroclastic flow. +ῌ ῐ ῎ ῑ ῏. +3-/ ; s2t +3-2W 9 +300
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(13) W. ¨© CD.ªmD\9W 9 +300. «-*/ῌ*201 ¬%®¯h +ῌ+ῌ+ °±²³´B µ Geological survey of Japan, National Institute of Advanced Industrial Science and Technology, +ῌ+ῌ+ Higashi, Tsukuba, Ibaraki -*/ῌ*201, Japan. «23*ῌ**0/ #$%#$¯¶· +ῌ,+ῌ-/. #$©¸¸ Faculty of Science, Kagoshima University, +ῌ,+ῌ-/ Korimoto, Kagoshima, Kagoshima 23*ῌ**0/, Japan. Corresponding author : Nobuo Geshi e-mail : [email protected].
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(131) ; y + R. Fig. 3. Schematic stratigraphy of the tephra younger than ca +* ka (Furutake and Shintake - Nagasako tephra) in Yumugi area, eastern part of the island.. HW w,; 623+?CS, (Fig. ++) 78P3 & (~4]G*(u ;} ( 3?CS,;-. ;]¤0¥32)C|¦DHW& Z¢@£.
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(140) s N-. K;. L )MN1<./ OPQ N-, '. 0 t uv;.03WXYwx MN1. Fig. +*. A : Total thickness of Furutake and Shintake-Nagasako tephra younger than K-Ah (1.- ka), B : maximum size of lithic fragments of N-m tephra (average of the largest three lapilli), C : distribution of the thickness of N-0 tephra, D : thickness of N-/ tephra, E : thickness of N-, tephra. F : Furutake crater, S : Shintake crater. Thickness unit is cm..
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(155) 4569 NOD 1
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(177) 34560. a (*,++*,L+ ; Table A+) 9:U. xv9Y. 7 +32* 8 9:0;<. M=>?yz{| %@v9Z[0;< v. YM=>?D} K-Ah . . ~ 7. =M=>? EF_ +,,*** a. /ῌ+
(178) . / . 7_ /,0** a ^9. TVA K-Ah a. =>?. %@ABC ?DEF GHIJ. 0;<. KL=M=>? EF GNOPQ. YM=> EFoOPEF GST. RGSTU. V WSXJYM=>?HZ[. U. V WY>s3H H] (Fig. -) YM=. (Fig. -) \]. =M=>? EFM=. > EFYM=> S]07. M=>? GZ0YM=>? GZ ^9: =. . TV -,*** aGZ0;<. M=>?. _ +,,/**`++,/** a =>bcde. vY>s3 8n_ +,***`+,,** a "2 . 8f]gM^Z[ hi. YM=>. ~ ++ ; ,-. ,**,/ 0. Fig. +,. Representative sections of the Furutake and Shintake-Nagasako tephra around Shintake and Furutake. Thickness unit is cm..
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(238) ¹º»L}¼». 16. Fig. +-. Summary of the volcanic activity of Kuchinoerabujima volcano. Representative overlap-relationship shows with arrows.. km- -
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(255) M X .YQCRS: 0@AZ $[ 6H56. BC =+ / 66. $ ,* <U , B'' D\ :;: E!"QCRS: ῏. ῎. ]F^G_`aH '`abcdFe%IJ f %&Kg0Lh ijMk . NO lP"k Qm^n Rf opqS r`aHTUsVf t$WP k XuvY*mZw[^x7\s]f Xuv^_`bcdF# ayfzbc {|d}e"k ]F^G_`aH. '`abcdF tKg '~ 90f-ighk , ijigk l?cGmPnop$[ q ῌ ῑ ῐ ῍ rNs (+303) %&4!Kgt +. +,1ῌ+-,. u vw3xyzV (+33-) %& 4!T 7 ' 4{T^|^ +33- rB. 17. }~ -,+. Q] (+33/) 3 o '(E U`a -. +-/ῌ+.3. Hayakawa, Y. (+32/) Pyroclastic geology of Towada volcano. Bull. Earthq. Res. Inst., Univ. Tokyo, 0*, /*1ῌ/3,. m (+3-.a) a 2 +, a 3 + %&66 ' 4 ,+ ,.-ῌ,00. m (+3-. b) %& 4! ' VW + ,*ῌ-3. e%IJ (,**,) %& ' +33, 0 ,**, 09O' ~ r 3 3 %& ~ r 11ῌ20. Xu4ZZ 3 ¡¢£H (+301) a .+ ++ ,, %&66t Qm¤¥Z ZOt ,, 13ῌ32. Z VW (+33+) m' V , W .**ῌ.*.. Z VW (,**/) m' V - W /13ῌ/2-. Kitagawa, H. and van der Plicht, J. (+332) A .*,*** years carve chronology from Lake Suigetsu, Japan : extension of the +.C calibration curve. Radiocarbon, .*, .3/ῌ /*.. xyzV37\s] (+332) %&4P34! XuvYE¦ XuKg§pt ῌ ¨ 30ῌ+*-. xyzV3n R3V (,**,) %& © 09O' ~ r . 3%& ~ r +03ῌ+2.. ]F^G_`aH3#]ªp^ª^3Xu^ ^ (+32+) +32* V3 ,2 W %&66 V«tW } |t ,* +ῌ3. 36e V (+310) ¬¡¢ ® Tn ¯M°± ^ .0 --3ῌ-.1. 36e V (+312) 1²£³´RCµ, ¬AR¶· U`a +1 +.-ῌ+0-. 36e V (+33,) AG>m¤ M¥¦ #]^ ,10 p. 36e V (,**-) 6 AG> m¤M¥¦ #]^ --0 p. §m¨ (+3-/) %&4!© , +ῌ +3. ª¸¹3e%IJ3º?«V3Solihin Agus (,**,) % &66
(256) 54»Z^¬e 0 9O' ~ r 3%& ~ r +/3ῌ+02. Miyashiro, A. (+31.) Volcanic rock series in island arcs and active continental margins. Am. Jour. Science, ,1., -,+ῌ-//. ® ¬3Westgate, J.3Sandhu, A.36e V (,***) 1²£H¼6< Isothermal plateau fissiontrack ¬M U^°± 4{T^| ^ ,*** rB}~ Qa-**.. Moor, J. G. and Albee, W. C. (+32,) Topographic and structural changes, March-July +32* Photogrammetric data. In The +32* Eruptions of Mount St. Helens (Lipman, P. W. and Mullineaux, D. R. eds), +,-ῌ+-...
(257) ª«¬®¯¬. 18. Fig. A+.. Whole-rock Na,O©K,O content and FeO*/MgO ratio plotted against their SiO, content.. USGS Professional Paper, +,/*, Washington. Morrissey, M. M. and Mastin, L. G. (,***) Vulcanian eruption. In Encyclopedia of Volcanoes (Sigurdsson et al. eds), .0-ῌ.1/. Academic Press. (+33/)
(258) !"# 1# +ῌ,-. Ramsey, B. C. (+33/) Radiocarbon calibration and analysis of stratigraphy : the OxCal program. Radiocarbon, -1, .,/ῌ.-*. Ramsey, B. C. (,**+) Development of the radiocarbon program OxCal. Radiocarbon, .-, -//ῌ-0-. $%&'( (+3-2) )*+ ,-./)012 3456789: 8# .# --3ῌ-/.. ;<=> (+31-) ?@ABCDEFGHIJKLMN
(259) ABOP 8# +2# +/-ῌ+02. Walker, G. P. L., Self, S. and Frogatt, P. C. (+32+) The ground layer of the Taupo ignimbrite : a striking example of sedimentation from a pyroclastic flow. Jour. Volcanol. Geotherm. Res., +*, +ῌ++. 8QRS (+331) TU
(260) VWXY.8 Z [ \# +*-# 010ῌ03+.. ῑ ῒ A+ῌ. C ῐ῎῍῏. +.. ]^_`a# )*+ ,%bcdefghi jk +- l +2 mnkopN# gq +. rstuk vw
(261) tuxyk Table A+ b# mnop lk Fig. + % b z { g q +. r s t u a | } ~ ^ _ (IAA) 234 Beta Analysis Inc. USA (BA) bN# |. }~[ (AMS) kFtuN
(262) mna e /NFCCkvw
(263) gq +. rsa Libby kFN# mn d +- C. kFN
(264) tua +.C tb ¡ H ¢ k , s ` z N
(265) t u x y £ r ¤ a Ramsey (+33/, ,**+) b3f¥¦§¨ OxCal ver. -.+* (,**.) k
(266) .
(267) Table A+.. Results of AMS +.C dating for the tephra of Kuchinoerabujima volcano..
(268) - 19.
(269) 20. Z. A, .
(270) . kClm1Y;! no p qrst7? SiO, VW
(271) //.,X0,.-. ! . wt.ῌ 1 uvwxOR21. " #$%&'
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(273) ? SiO, //.,X/1.3 wt.ῌ MN.
(274) <=3>? FeO*ῌMgO @4A. ^. ~{*? SiO,
(275) 0,.*X0,.- wt.ῌ 1 <. BC SiO, DE Miyashiro (+31.) 5FGHF5I. &; F#L MN! QRps. JK#L MN! OPQRSTUOR ?. t7
(276) ? SiO, //.0X/3.* wt.ῌ 1 . SiO, VW
(277) /3.,X0,.3 wt.ῌ 1Y;! OPQR. 43C<; iBC
(278) @a SiO, 4B<. ZOR [STU#LVW
(279) \]^_. #L MN!. BCS *`abcde fgN;hi
(280) j&. .
(281)
図
+2
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