著者
久野 久
出版者
公益社団法人 東京地学協会
雑誌
地學雜誌 (ISSN:0022135X)
巻号頁・発行日
vol.73, no.5, pp.279-280, 1964
被引用文献数
1

Basalt magmas in Japan range in composition from tholeiite, passing through high-alumina basalt, to alkali basalt. Picrite basalt related to either of these three basalt magmas is scarcely represented. In Hawaii, both tholeiite and alkali basalt are closely associated with picrite basalt having bulk compositions intermediate between the ordinary basalt and peridotite. The Japanese basalt magmas are supposed to be produced by sudden release of stress attending the generation of the intermediate to deep-focus earthquakes. In such a case, there may be a certain limitation of the heat energy supply for melting the mantle peridotite ; only a few per cent of the peridotite would be melted to form the basalt magmas.<BR>The Hawaiian basalt magmas are supposed to be produced by the heat transfer due to convection current within the mantle. In such a case, there would be less limitation of the heat energy supply for melting ; a greater per cent of the peridotite would be melted, resulting in the production of picrite basalt magmas.
著者
青木 斌 伊東 正喜
出版者
地学団体研究会
雑誌
地球科学 (ISSN:03666611)
巻号頁・発行日
vol.23, no.3, pp.118-120, 1969

久野(1960)は,"高アルミナ玄武岩"がアルカリ玄武岩とソレイアイトの中間的な性質を示すと定義した.その後かれは,"高アルミナ玄武岩"がアルカリ玄武岩と低アルカリソレイアイトの中間的な性質を示すと修正した(久野,1965; 1967; 1968a; 1968b).本論文では,カムチャツカ地域と千島列島の第四紀玄武岩の資料を整理し,次の2つの結論をえた.1)"高アルミナ玄武岩"は,低アルミナ玄武岩と共存する."高アルミナ玄武岩"の中間性という久野の見解は,カムチャツカ地域と千島列島では否定される.2)久野(1965; 1967; 1968bなど)は,環太平洋造山帯では,アルカリ玄武岩・"高アルミナ玄武岩"・低アルカリソレイアイトという漸移関係のあることを指摘してきたが,これは,高アルカリソレイアイトを無視した機械的な結論である.
著者
久野 久
出版者
特定非営利活動法人 日本火山学会
雑誌
火山.第2集
巻号頁・発行日
vol.2, no.2, pp.59-62, 1957

Human remains of Middle Zyomon (Jomon) age (about 4500 years old) have been found between a tuff layer and a lava flow exposed at Tatunokuti on the western coast of O-sima, Izu, south-southwest of Tokyo. These rocks were formed during the period of pre-caldera or Somma lava activity. As the surface of the tuff layer had been subjected to weathering and stream erosion before the remains were laid down, the volcano appears to have been dormant or at least weakly active for some time before the pre-historic men lived at this place. The time interval between this stage and the close of the Somma lava activity is estimated as at least 1000 years, and probably about 2000 years . Therefore the formation of the summit caldera may be dated as 3000 or 2000 years old.
著者
冨田達
雑誌
鈴木醇教授還暦記念論文集
巻号頁・発行日
1958
被引用文献数
1
著者
石原 舜三
出版者
資源地質学会
雑誌
資源地質 (ISSN:09182454)
巻号頁・発行日
vol.62, no.1, pp.106-108, 2012-03-05
参考文献数
7
著者
久野 久
出版者
日本地質学会
雑誌
地質学雑誌 (ISSN:00167630)
巻号頁・発行日
vol.56, no.656, pp.226-231, 1950
被引用文献数
1