| Item type |
デフォルトアイテムタイプ（フル）(1) |
| 公開日 |
2008-03-28 |
| タイトル |
|
|
タイトル |
Geology and Petrology of the Nishi and Fudenzaki Formations of the Aguni Group, Aguni Island, the Central Ryukyu Arc : Petrogenetic Relationship between the Andesites and Dacites |
|
言語 |
en |
| 作成者 |
Shinjo, Ryuichi
Usami, Ken
Kato, Yuzo
新城, 竜一
|
| アクセス権 |
|
|
アクセス権 |
open access |
|
アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
| 内容記述 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
The late Miocene volcanic rocks of the Aguni Group range from basalt to rhyolite, and have a pronounced compositional gap between 57 and 69 wt.% SiO_2. Sr isotopic ratios for a dacite lava from the Nishi Formation (0.70463) and a gabbroic fragment from the Fudenzaki Formation (0.70455) are similar to those of the basalt-andesite suite (0.70452-0.70466). Both major- and trace-element variations from andesite to dacite are explainable in terms of fractional crystallization involving removal of the observed phenocryst phases in the evolved volcanic rocks. The Rare Earth Elements (REE) patterns of gabbroic fragments appear to coincide with the pattern of cumulate expected from fractional crystallization. A shallow composition-temperature slope of cotectic involving amphibole-bearing gabbroic assemblages is responsible for the development of bimodality between the andesites and dacites. |
| 内容記述 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
紀要論文 |
| 出版者 |
|
|
出版者 |
琉球大学理学部 |
|
言語 |
ja |
| 言語 |
|
|
言語 |
eng |
| 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 |
| 出版タイプ |
|
|
出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| 識別子 |
|
|
識別子 |
http://hdl.handle.net/20.500.12000/5436 |
|
識別子タイプ |
HDL |
| 収録物識別子 |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
0286-9640 |
| 収録物識別子 |
|
|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AN00250774 |
| 収録物名 |
|
|
収録物名 |
琉球大学理学部紀要 |
|
言語 |
ja |
| 収録物名 |
|
|
収録物名 |
Bulletin of the College of Science. University of the Ryukyus |
|
言語 |
en |
| 書誌情報 |
号 60,
p. 27-50,
発行日 1995-09
|
No60p27.pdf
