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Rock velocities at atmospheric pressure and room temperature in Tanzawa plutonic rocks from central Japan
https://nipr.repo.nii.ac.jp/records/2345
https://nipr.repo.nii.ac.jp/records/2345c58989ce-cb54-4688-94bd-5a9a43f5880f
名前 / ファイル | ライセンス | アクション |
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||||||
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公開日 | 1998-12-01 | |||||||||
タイトル | ||||||||||
言語 | en | |||||||||
タイトル | Rock velocities at atmospheric pressure and room temperature in Tanzawa plutonic rocks from central Japan | |||||||||
言語 | ||||||||||
言語 | eng | |||||||||
キーワード | ||||||||||
言語 | en | |||||||||
主題Scheme | Other | |||||||||
主題 | compressional-wave | |||||||||
キーワード | ||||||||||
言語 | en | |||||||||
主題Scheme | Other | |||||||||
主題 | shear-wave | |||||||||
キーワード | ||||||||||
言語 | en | |||||||||
主題Scheme | Other | |||||||||
主題 | Poisson's ratio | |||||||||
キーワード | ||||||||||
言語 | en | |||||||||
主題Scheme | Other | |||||||||
主題 | acoustic impedance | |||||||||
キーワード | ||||||||||
言語 | en | |||||||||
主題Scheme | Other | |||||||||
主題 | island-arc | |||||||||
資源タイプ | ||||||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||
資源タイプ | departmental bulletin paper | |||||||||
ページ属性 | ||||||||||
内容記述タイプ | Other | |||||||||
内容記述 | P(論文) | |||||||||
著者名(英) |
Kitamura, Keigo
× Kitamura, Keigo
× Ishikawa, Masahiro
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著者所属(英) | ||||||||||
en | ||||||||||
Department of Environmental Sciences, Faculty of Education and Human Sciences, Yokohama National University | ||||||||||
著者所属(英) | ||||||||||
en | ||||||||||
Department of Environmental Sciences, Faculty of Education and Human Sciences, Yokohama National University | ||||||||||
抄録(英) | ||||||||||
内容記述タイプ | Other | |||||||||
内容記述 | The Tanzawa plutonic complex, which is composed mainly of tonalite with minor quartz gabbro and gabbro, is exposed at the northern end of the Izu-Bonin island-arc. It is interpreted as exposed middle crust of the Izu-Bonin arc which was uplifted during the collision of Izu-Bonin arc with the Honshu arc in Japan. Determination of elastic wave velocity in these rocks is crucial to interpret the seismic velocity structure of the Izu-Bonin arc. Compressional-wave (Vp) and shear-wave (Vs) velocities from Tanzawa plutonic rocks were measured at 1 atm and room temperature. The P-wave and S-wave velocities are strongly dependent upon the lithology : gabbro (Vp=4.89-5.44km/s, Vs=2.49-2.86km/s), quartz gabbro (Vp=4.90-4.97km/s, Vs=2.39-2.50km/s), tonalite (Vp=4.25-4.71km/s, Vs=2.40-2.48km/s), granitic aplite (Vp=3.82km/s, Vs=2.11km/s). The Tanzawa plutonic rocks show a positive correlation between elastic-wave velocity and density, and a rough positive correlation between Vp and Vs. Theoretical Voigt-Reuss-Hill average Vp values were also calculated for tonalites, quartz gabbro and gabbros at 1.0 GPa pressure. Theoretical Vp is about 2km/s faster than measured Vp at atmospheric pressure. The measured Vp of plutonic rocks (4.25-5.44km/s) is faster than the refraction-determined P-wave velocity in 2km-thick uppermost crust (2.5-4.0km/s) of the Izu-Bonin island arc, implying that plutonic rocks are not present at 0-2km depth. Theoretical Vp values of tonalite and quartz gabbro are consistent with the velocity structure of middle crust (6.0-6.7km/s velocity). The theoretical Vp of hornblende gabbro (7.0-7.2km/s) can explain the lower crustal P-wave velocity structure (7.1-7.2km/s). The high P-wave velocity (7.2-7.3km/s) in the lowermost crust implies a high content of orthopyroxene (more than 20%). | |||||||||
雑誌書誌ID | ||||||||||
収録物識別子タイプ | NCID | |||||||||
収録物識別子 | AA00733561 | |||||||||
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue 巻 53, p. 192-202, 発行日 1998-12 |