Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
1979-10-01 |
タイトル |
|
|
言語 |
en |
|
タイトル |
Chemical Characteristics of Biotites and Hornblendes from Metamorphic Rocks around Lutzow-Holmbukta, East Antarctica |
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 |
ページ属性 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
P(論文) |
著者名(英) |
Kanisawa, Satoshi
Onuki, Hitoshi
Yanai, Keizo
|
著者所属(英) |
|
|
|
en |
|
|
Department of Earth Sciences, College of General Education, Tohoku University/Department of Earth Sciences, Faculty of Science, Hirosaki University/National Institute of Polar Research |
抄録(英) |
|
|
内容記述タイプ |
Other |
|
内容記述 |
Chemical compositions of biotites and hornblendes in metamorphic rocks around Lutzow-Holmbukta show that these minerals have the characteristics of granulite facies ones. Some low-Ti biotites and hornblendes may be due to low TiO_2 content of host rocks. Chemical natures of biotites and hornblendes reflect those of their host rocks, that is, biotites from metabasites are phlogopite and Na_2O-rich ones, while those from paragneisses are Fe-rich and Na_2O-poor ones. The replacement of R^<2+> by R^<3+> ions in octahedral sites in biotites increases from metabasites through charnockites to paragneisses. Hornblendes from metabasites are richer in Na_2O than K_2O, but the proportion is reversed in hornblendes from charnockites and hornblende gneisses. The values of log (ƒ_<H_2O>/ƒ_<HF>) of fluid phase coexisting with biotites during crystallization are 4.3 in metabasites and 3.8 in paragneisses, respectively. From the available data of the F content of hydrous minerals in various metamorphic terrains, it can be presumed that the ratio of ƒ_<H_2O>/ƒ_<HF> decreases during progressive metamorphism. |
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 14,
p. 153-163,
発行日 1979-10
|