個別火山体データ 449 ver.(991222)

271
449 古期御嶽火山別名　日本の火山第１版　　55　
火山番号 70 　日本の火山第２版　　70　
火山名御嶽　活火山カタログ　　37　
個別火山体の位置　火山体番号　　70-8　

　著　者　小林武彦 (改　林信太郎）

位置と大きさ
　　　　　　地形的　　主火道　
　緯　　度　　　　35゜53′23″　
　経　　度　　　　137゜29′01″　

　最高点高度　　2296　 m
　基盤高度　　1800　 m
　分布面積　　　 km²
　火山体体積　　41 　 km³

活動時代と性質
　噴出物の分類　　溶岩，降下火砕物層，火砕流堆積物　
　火山体の分類　　SC　
　層序　　0.75 - 0.42 Ma [4]0.78 - 0.39 Ma [5]　
　年代測定値　　K-Ar (peak comparison, groundmass)Western area, Kuragoehara Lava, 0.53 ± 0.02 Ma [4]Western area, Kuragoehara Lava, 0.53 ± 0.02 Ma [4]Western area, Kuragoehara Lava, 0.55 ± 0.02 Ma [4]Western area, Kuragoehara Lava, 0.5 ± 0.02 Ma [4]Western area, Kuragoehara Lava, 0.5 ± 0.02 Ma [4]Western area, Kuragoehara Lava, 0.52 ± 0.02 Ma [4]Western area, Kuragoehara Lava, 0.53 ± 0.02 Ma [4]Western area, Makuiwagawa Lava, 0.61 ± 0.02 Ma [4]Western area, Hakotani Lava, 0.64 ± 0.02 Ma [4]Western area, Shiranunodani Lava, 0.63 ± 0.02 Ma [4]Western area, Shiranunodani Lava, 0.65 ± 0.02 Ma [4]Western area, Shiranunodani Lava, 0.66 ± 0.02 Ma [4]Western area, Tsuchiurazawa Lava, 0.65 ± 0.03 Ma [4]Southeastern area, Mikasayama Lava, 0.43 ± 0.02 Ma [4]Southeastern area, Mikasayama Lava, 0.44 ± 0.02 Ma [4]Southeastern area, Mikasayama Lava, 0.42 ± 0.01 Ma [4]Southeastern area, Mizuguchigawa Lava, 0.6 ± 0.03 Ma [4]Southeastern area, Suzugasawa Lava, 0.65 ± 0.03 Ma [4]Southeastern area, Kuragoehara Lava, 0.74 ± 0.02 Ma [4]Southeastern area, Kuragoehara Lava, 0.74 ± 0.02 Ma [4]Southeastern area, Kuragoehara Lava, 0.73 ± 0.02 Ma [4]Southeastern area, Kuragoehara Lava, 0.73 ± 0.03 Ma [4]Eastern area, Kuragoehara Lava, 0.67 ± 0.02 Ma [4]Eastern area, Makuiwagawa Lava, 0.69 ± 0.02 Ma [4]Eastern area, Makuiwagawa Lava, 0.71 ± 0.02 Ma [4]Eastern area, Tsuchiurazawa Lava, 0.72 ± 0.03 Ma [4]Northern area, Nunokawa Lava, 0.63 ± 0.02 Ma [4]Northern area, Nunokawa Lava, 0.72 ± 0.03 Ma [4]Northern area, Nunokawa Lava, 0.72 ± 0.02 Ma [4]Northern area, Sengendaru Lava, 0.081 ± 0.023 Ma [4]Northern area, Kuragoehara Lava, 0.68 ± 0.02 Ma [4]Northern area, Kuragoehara Lava, 0.7 ± 0.03 Ma [4]Northern area, Kuragoehara Lava, 0.69 ± 0.02 Ma [4]Northern area, Makuiwagawa Lava, 0.7 ± 0.03 Ma [4]Northern area, Tsuchiurazawa Lava0.71 ± 0.02 Ma [4]K-Ar (isotope dilution, groundmass)West, Sw, 0.464 ± 0.007 Ma [5]West, Oc, 0.504 ± 0.007 Ma [5]West, Mu, 0.597 ± 0.009 Ma [5]West, Hn, 0.645 ± 0.01 Ma [5]West, Km7, 0.66 ± 0.01 Ma [5]West, Km6, 0.678 ± 0.011 Ma [5]West, Km5, 0.67 ± 0.01 Ma [5]West, Km4, 0.681 ± 0.01 Ma [5]West, Km3, 0.662 ± 0.015 Ma [5]West, Km2, 0.707 ± 0.012 Ma [5]West, Km1, 0.693 ± 0.021 Ma [5]West, Hy, 0.699 ± 0.01 Ma [5]Southwest, Kka, 0.5 ± 0.007 Ma [5]Southwest, Ht, 0.588 ± 0.008 Ma [5]Southwest, Kda, 0.605 ± 0.009 Ma [5]Southwest, Ho, 0.594 ± 0.009 Ma [5]South, On, 0.438 ± 0.006 Ma [5]South, Kkb, 0.502 ± 0.007 Ma [5]South, Kt, 0.526 ± 0.008 Ma [5]South, Kdb, 0.586 ± 0.018 Ma [5]South, Wg, 0.618 ± 0.009 Ma [5]South, Sk, 0.711 ± 0.012 Ma [5]Southeast, Mk, 0.393 ± 0.006 Ma [5]Southeast, Mz, 0.503 ± 0.007 Ma [5]Southeast, Ok, 0.635 ± 0.01 Ma [5]Southeast, Ot, 0.662 ± 0.01 Ma [5]Southeast, Kg2, 0.694 ± 0.01 Ma [5]Southeast, Kg1, 0.697 ± 0.01 Ma [5]East, Mm, 0.615 ± 0.009 Ma [5]East, St, 0.619 ± 0.009 Ma [5]East, Ut, 0.577 ± 0.028 Ma [5]East, Ut(S), 0.597 ± 0.088 Ma [5]East, Td, 0.709 ± 0.011 Ma [5]East, Nt, 0.724 ± 0.014 Ma [5]East, Fm, 0.774 ± 0.014 Ma [5]East, Mt, 0.732 ± 0.016 Ma [5]East, Iz, 0.612 ± 0.047 Ma [5]East, Iz(S), 0.779 ± 0.136 Ma [5]East, Kr, 0.642 ± 0.01 Ma [5]East, Mh, 0.635 ± 0.01 Ma [5]East, Yua, 0.695 ± 0.01 Ma [5]East, Yub, 0.695 ± 0.01 Ma [5]North, Tna, 0.978 ± 0.01 Ma [5]North, Tnb, 0.661 ± 0.01 Ma [5]North, Oba, 0.679 ± 0.01 Ma [5]North, Obb, 0.687 ± 0.01 Ma [5]North, Sg2, 0.676 ± 0.011 Ma [5]North, Sg1, 0.695 ± 0.01 Ma [5]North, Ku, 0.711 ± 0.01 Ma [5]　

岩石名
　玄武岩　　あり　
　玄武岩質安山岩　　主要　
　安山岩　　多い　
　デイサイト　　あり　
　流紋岩　　なし　
　その他　　　
　化学分析値　
　Aug-ol basalt (SiO2=50.8 %); Hyp+-bg. ol-aug basaltic andesite (SiO2=50.3-52.4 %); Aug-bg. ol basaltic andesite (SiO2=51.1 %); Aphyric basaltic andesite (SiO2=53.2%); Hyp-aug andesite (SiO2=54.1 %); Ol-bg. aug-hyp andesite (SiO2=55.2 %); Aug-hyp andesite (SiO2=56.9-62.8 %); Aug-hyp-ho andesite (SiO2=59.9-61.4 %); Ho-bg. ol-aug-hyp andesite (SiO2=59.1-63.9 %); Aug+-bg. ho-hyp dacite (SiO2=65.4-67.3 %) [1] 　

引用文献
1 　山田直利・小林武彦（1988）「御嶽山地域の地質｣、地域地質研究報告(5万分の1地質図幅)、地質調査所、136p. 　Yamada, N. and Kobayashi, T. (1988) Geology of Ontakesan district. With Geological Sheet Map at 1:50,000, Geol.Surv.Japan, 136p. 1103
2 　　Matsumoto, A. and Kobayashi, T. (1995) K-Ar determination of late Quaternary volcanic rocks using the "mass fractionation correction procedure": application to the Younger Ontake Volcano, central Japan. Chemical Geology (Isotope Geoscience Section), vol. 125, p. 123-135. 46
3 　小林武彦（1993）御嶽火山の活動史と噴出物の体積計測．文部省科学研究費「火山災害の規模と特性｣報告書，p.87-96. 　Kobayashi, T. (1993) Production rate and K-Ar datings of Ontake volcano. Report for Grant of the Japanese ministry of Education, Science and culture "The volume and characteristics of volcanic disasters", p. 87-96. 451
4 　松本哲一、小林武彦 (1999) 御嶽火山、古期御嶽火山噴出物のK-Ar年代に基づく火山活動史の再検討．火山，44，1-12．　Matsumoto, A. and Kobayashi, T. (1999) K-Ar Ages of the Older Ontake Volcanic Products, Ontake Volcano, Central Japan: Reappraisal of the Volcanic History Based on the Radiometric Data. Bull. Volc. Soc. Japan, 44, 1-12. (in Japanese with English Abstract) 552
5 　　Kioka, H., Furuyama, K., Miyake, Y., Sakai, J., Nagao, K., Ikemoto, M., Noiri, Hisayuki and Oda, K. (1998) K-Ar chronology of the Middle Pleistocene lavas at Ontake volcano, central Japan． Jour. Asso. Geol. Coll. Japan (Chikyu Kagaku)，52，464-474． 46

271
	449	古期御嶽火山	別名		日本の火山第１版	55
			火山番号	70	日本の火山第２版	70
			火山名	御嶽	活火山カタログ	37
			個別火山体の位置		火山体番号	70-8

位置と大きさ
	地形的	主火道
緯　　度		35゜53′23″
経　　度		137゜29′01″
最高点高度	2296	m
基盤高度	1800	m
分布面積		km²
火山体体積	41	km³

活動時代と性質
噴出物の分類	溶岩，降下火砕物層，火砕流堆積物
火山体の分類	SC
層序	0.75 - 0.42 Ma [4]0.78 - 0.39 Ma [5]
年代測定値	K-Ar (peak comparison, groundmass)Western area, Kuragoehara Lava, 0.53 ± 0.02 Ma [4]Western area, Kuragoehara Lava, 0.53 ± 0.02 Ma [4]Western area, Kuragoehara Lava, 0.55 ± 0.02 Ma [4]Western area, Kuragoehara Lava, 0.5 ± 0.02 Ma [4]Western area, Kuragoehara Lava, 0.5 ± 0.02 Ma [4]Western area, Kuragoehara Lava, 0.52 ± 0.02 Ma [4]Western area, Kuragoehara Lava, 0.53 ± 0.02 Ma [4]Western area, Makuiwagawa Lava, 0.61 ± 0.02 Ma [4]Western area, Hakotani Lava, 0.64 ± 0.02 Ma [4]Western area, Shiranunodani Lava, 0.63 ± 0.02 Ma [4]Western area, Shiranunodani Lava, 0.65 ± 0.02 Ma [4]Western area, Shiranunodani Lava, 0.66 ± 0.02 Ma [4]Western area, Tsuchiurazawa Lava, 0.65 ± 0.03 Ma [4]Southeastern area, Mikasayama Lava, 0.43 ± 0.02 Ma [4]Southeastern area, Mikasayama Lava, 0.44 ± 0.02 Ma [4]Southeastern area, Mikasayama Lava, 0.42 ± 0.01 Ma [4]Southeastern area, Mizuguchigawa Lava, 0.6 ± 0.03 Ma [4]Southeastern area, Suzugasawa Lava, 0.65 ± 0.03 Ma [4]Southeastern area, Kuragoehara Lava, 0.74 ± 0.02 Ma [4]Southeastern area, Kuragoehara Lava, 0.74 ± 0.02 Ma [4]Southeastern area, Kuragoehara Lava, 0.73 ± 0.02 Ma [4]Southeastern area, Kuragoehara Lava, 0.73 ± 0.03 Ma [4]Eastern area, Kuragoehara Lava, 0.67 ± 0.02 Ma [4]Eastern area, Makuiwagawa Lava, 0.69 ± 0.02 Ma [4]Eastern area, Makuiwagawa Lava, 0.71 ± 0.02 Ma [4]Eastern area, Tsuchiurazawa Lava, 0.72 ± 0.03 Ma [4]Northern area, Nunokawa Lava, 0.63 ± 0.02 Ma [4]Northern area, Nunokawa Lava, 0.72 ± 0.03 Ma [4]Northern area, Nunokawa Lava, 0.72 ± 0.02 Ma [4]Northern area, Sengendaru Lava, 0.081 ± 0.023 Ma [4]Northern area, Kuragoehara Lava, 0.68 ± 0.02 Ma [4]Northern area, Kuragoehara Lava, 0.7 ± 0.03 Ma [4]Northern area, Kuragoehara Lava, 0.69 ± 0.02 Ma [4]Northern area, Makuiwagawa Lava, 0.7 ± 0.03 Ma [4]Northern area, Tsuchiurazawa Lava0.71 ± 0.02 Ma [4]K-Ar (isotope dilution, groundmass)West, Sw, 0.464 ± 0.007 Ma [5]West, Oc, 0.504 ± 0.007 Ma [5]West, Mu, 0.597 ± 0.009 Ma [5]West, Hn, 0.645 ± 0.01 Ma [5]West, Km7, 0.66 ± 0.01 Ma [5]West, Km6, 0.678 ± 0.011 Ma [5]West, Km5, 0.67 ± 0.01 Ma [5]West, Km4, 0.681 ± 0.01 Ma [5]West, Km3, 0.662 ± 0.015 Ma [5]West, Km2, 0.707 ± 0.012 Ma [5]West, Km1, 0.693 ± 0.021 Ma [5]West, Hy, 0.699 ± 0.01 Ma [5]Southwest, Kka, 0.5 ± 0.007 Ma [5]Southwest, Ht, 0.588 ± 0.008 Ma [5]Southwest, Kda, 0.605 ± 0.009 Ma [5]Southwest, Ho, 0.594 ± 0.009 Ma [5]South, On, 0.438 ± 0.006 Ma [5]South, Kkb, 0.502 ± 0.007 Ma [5]South, Kt, 0.526 ± 0.008 Ma [5]South, Kdb, 0.586 ± 0.018 Ma [5]South, Wg, 0.618 ± 0.009 Ma [5]South, Sk, 0.711 ± 0.012 Ma [5]Southeast, Mk, 0.393 ± 0.006 Ma [5]Southeast, Mz, 0.503 ± 0.007 Ma [5]Southeast, Ok, 0.635 ± 0.01 Ma [5]Southeast, Ot, 0.662 ± 0.01 Ma [5]Southeast, Kg2, 0.694 ± 0.01 Ma [5]Southeast, Kg1, 0.697 ± 0.01 Ma [5]East, Mm, 0.615 ± 0.009 Ma [5]East, St, 0.619 ± 0.009 Ma [5]East, Ut, 0.577 ± 0.028 Ma [5]East, Ut(S), 0.597 ± 0.088 Ma [5]East, Td, 0.709 ± 0.011 Ma [5]East, Nt, 0.724 ± 0.014 Ma [5]East, Fm, 0.774 ± 0.014 Ma [5]East, Mt, 0.732 ± 0.016 Ma [5]East, Iz, 0.612 ± 0.047 Ma [5]East, Iz(S), 0.779 ± 0.136 Ma [5]East, Kr, 0.642 ± 0.01 Ma [5]East, Mh, 0.635 ± 0.01 Ma [5]East, Yua, 0.695 ± 0.01 Ma [5]East, Yub, 0.695 ± 0.01 Ma [5]North, Tna, 0.978 ± 0.01 Ma [5]North, Tnb, 0.661 ± 0.01 Ma [5]North, Oba, 0.679 ± 0.01 Ma [5]North, Obb, 0.687 ± 0.01 Ma [5]North, Sg2, 0.676 ± 0.011 Ma [5]North, Sg1, 0.695 ± 0.01 Ma [5]North, Ku, 0.711 ± 0.01 Ma [5]

岩石名
玄武岩	あり
玄武岩質安山岩	主要
安山岩	多い
デイサイト	あり
流紋岩	なし
その他

引用文献
1	山田直利・小林武彦（1988）「御嶽山地域の地質｣、地域地質研究報告(5万分の1地質図幅)、地質調査所、136p.	Yamada, N. and Kobayashi, T. (1988) Geology of Ontakesan district. With Geological Sheet Map at 1:50,000, Geol.Surv.Japan, 136p.	1103
2		Matsumoto, A. and Kobayashi, T. (1995) K-Ar determination of late Quaternary volcanic rocks using the "mass fractionation correction procedure": application to the Younger Ontake Volcano, central Japan. Chemical Geology (Isotope Geoscience Section), vol. 125, p. 123-135.	46
3	小林武彦（1993）御嶽火山の活動史と噴出物の体積計測．文部省科学研究費「火山災害の規模と特性｣報告書，p.87-96.	Kobayashi, T. (1993) Production rate and K-Ar datings of Ontake volcano. Report for Grant of the Japanese ministry of Education, Science and culture "The volume and characteristics of volcanic disasters", p. 87-96.	451
4	松本哲一、小林武彦 (1999) 御嶽火山、古期御嶽火山噴出物のK-Ar年代に基づく火山活動史の再検討．火山，44，1-12．	Matsumoto, A. and Kobayashi, T. (1999) K-Ar Ages of the Older Ontake Volcanic Products, Ontake Volcano, Central Japan: Reappraisal of the Volcanic History Based on the Radiometric Data. Bull. Volc. Soc. Japan, 44, 1-12. (in Japanese with English Abstract)	552
5		Kioka, H., Furuyama, K., Miyake, Y., Sakai, J., Nagao, K., Ikemoto, M., Noiri, Hisayuki and Oda, K. (1998) K-Ar chronology of the Middle Pleistocene lavas at Ontake volcano, central Japan． Jour. Asso. Geol. Coll. Japan (Chikyu Kagaku)，52，464-474．	46