肘折火山：噴出物の層序と火山活動の推移
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(3) ,**1 3 ,+ . Stratigraphy and volcanic activities of Hijiori volcano, Northeastern Japan arc Isoji MIYAGI῍ The volcanic activity of Hijiori volcano (N-2-0῎-/, E+.*3῎,* ; WGS2.) is reported in detail as a case study to understand how a new felsic volcano commences the activity. Hijiori volcano, a small caldera with approximately , km in diameter, is an active volcano of Japan, which started a series of eruptions +,,*** years ago (in Calendar age), where no volcanic body had existed before. The eruptive history of Hijiori volcano was divided into four major stages (Stage +, ,, -, .) and the subdivisions (Stage +, Stage ,῍+, ,῍,, Stage -῍+, -῍,, -῍- [a, b], Stage .῍+ [a, b, c, d, e], .῍,, .῍-). Time span of each hiatus among the four major stages is shorter enough to produce no black soils, and no significant di#erence in the +.C age have been recognized between the stage + and stage -. The major eruptive product of Hijiori volcano turns out to be valley filling non-welded (Stage +, -῍- [a, b]) and partly welded (Stage ,῍,) pumice flow deposits with total maximum thickness of about +/* m and with a range / km to the southward and 3 km to the northward. The accompanying pumice fall (Stage +, ,῍,, -῍- [a, b]) and ash fall (Stage .῍,) are dispersed 0* km to the eastward. All the essential pumice from the eruptions were hypersthene-hornblende-quartz dacite. There are phreatic (or phreatomagmatic) eruptions at the beginning of Stage ,, -, and . which deposited lapilli falls and flows (Stage ,῍+, -῍+, .῍+ [a῍e]) in the proximity. The volume of the valley filling pyroclastic flow deposit and the air fall deposit are +.. and *.0 km-, respectively, and the caldera filling deposit is estimated to be *.- km-. Therefore, total eruptive volume of Hijiori volcano is estimated to be about ,.- km-. Key words : Hijiori, caldera, new volcano, pyroclastic flow. +ῌ ῐ ῎ ῑ ῏. |}C\~IQR S' .
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(32) G&{ ®-*/ῌ2/01 ¯a)° + + + £±² ³´µ¶·F¡¢ῌQ¸¹º·F»¼4 Geological Survey of Japan, AIST, Tsukuba Central 1, Tsukuba, Ibaraki -*/ῌ2/01, Japan.. Corresponding author : Isoji Miyagi e-mail : miyagi.iso+.***@aist.go.jp.
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(356) 326. ῎ῐ῍῏. Fig. 3. Typical occurrences of Hijiori eruptive products. A : Stage -ῌ-a pyroclastic flow deposit at “Warabi-no”, bearing 0+ degrees and /.* km from the caldera center. B : Close up of photo A. C : Flat floor of the Hijiori caldera covered with lake deposit and circular pit with ,/* m in diameter and ῌ.* m of relative height (center of this photo) at “Kan-kane-no”. D : Proximal faces of the stage .ῌ, pumice flow deposit at the eastward of “Mogami-tai”, bearing +-3 degrees and -./ km from the caldera center. E : Distal faces of the stage -ῌ-a fallout and .ῌ, pumice flow deposit at “Yakurai-san”, bearing 3/ degrees and .1., km from the caldera center. F : Unconformity between the stage -ῌ-b pyroclastic flow deposit and stage .ῌ+ lapilli fall at “Yuno-tai”, +*, degrees and -., km from the center..
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(489) lDD$'2i /**3** m no. $C:gh .* m ijk4&^ (Fig. 3C) #.
(490)
(491) pq lD'2i 0**+,*** m no
(492). I"Alm"n 3 2I D. rso
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(494) %Ck ¢ADD$'2i. oE
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(511) ®+¯4e i,2 +,2/*+,-/* m ( ,2? 2HI # Fig. ++. Estimated amount of accidental material and essential (ºaccessory) material from the Hijiori stage +, ,῍,, -῍,, -῍-a, -῍-b, .῍+ and .῍,.. ' '
(512) °±²o³´²µ¶·-¸9 /
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(535) J14. ) C +,2/* +,-/* m
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(549) . ]^O? OG# km . Z[J\
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(562) D4. OAYn-.GoP _`_p. +ῌ, cm µp lK¨!K. QRS/&;4TU\_`_.GVJM WQRp.
(563) ;& ¶# ¶# T8·¨!. X"YS&;4TU\_`_.GqQ\ Z[&. & +*ῌ+/ cm y©¸, - m Z[
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(565) 9:Bo : ./ *Bor;¼
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(567) *.1 mm !"
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