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ID 6992
タイトルヨミ
オガサワラ チチジ マムジンイワ ノ キサイ ガンセキ ガクテキ ケンキュウ : ムジン イワ マクラジョウ ヨウガン ノ スイチョク ヘンカ
日本語以外のタイトル
Petrological Characteristics of Boninite from Chichijima Island, Ogasawara, Japan : Vertical Petrological Diversity of Boninite Pillow Lava
ファイル
言語
日本語
属性
自然科学
著者
多久 雅啓
内容記述(抄録等)
Chichijima, Ogasawara Islands is the place where boninite has been exposed most voluminously all over the world. Moreover, it is “type locality” of boninite. Boninite is high-magnesian andesite (HMA) which is a primary andesite basis of its high Mg, Ni and Cr content, directly derived from mantle. We did detailed research and sampling of boninite based on geological map of Chichijima (Umino and Nakano, 2007) and clarified and classified petrographic characteristics of boninite. Uminio (1986) classified aphyric boninite from Chichijima into five types: (I) olivine (ol) + clinoenstatite (cen) + bronzaite (brz); (II) ol + brz; (III) brz; (IV) brz + pigeonite (pig) + augite (aug); (V) cen + brz. We can classified the type (II) of Umino (1986) divided into four types by phenocryst and micro-phenocryst assemblage. They are Type AI (phenocryst: (ol + serpentine (ser)) / brz ≧1 and micro-phenocryst: brz / clinopyroxene (cpx) ≧1), Type AII (phenocryst: (ol + serpentine (ser)) / brz ≧1 and micro-phenocryst: brz / clinopyroxene (cpx) < 1), Type BI (phenocryst: (ol + serpentine (ser)) / brz < 1 and micro-phenocryst: brz / clinopyroxene (cpx) ≧1 ) and Type BII (phenocryst: (ol + serpentine (ser)) / brz <1 and micro-phenocryst: brz / clinopyroxene (cpx) <1 ). It has been understood that the above four types rock appears in respective height in the pillow lava bed.
掲載誌名
島根大学教育学部紀要
43
開始ページ
123
終了ページ
135
ISSN
18808581
発行日
2009-12-25
NCID
AA12171265
DOI(SelfDOI)
出版者
島根大学教育学部
出版者別表記
Faculty of Education Shimane University
資料タイプ
紀要論文
ファイル形式
PDF
著者版/出版社版
出版社版
部局
教育学部
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