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  1. 050 理学部
  2. 10 学術雑誌論文
  3. 10 査読済論文
  1. 0 資料タイプ別
  2. 01 学術雑誌論文

An AFC (assimilation and fractional crystallization) process as the petrogenesis of andesites from the Pliocene Myojin-iwa Formation, the back-arc side of the Northeast Japan : combined major-and trace-element and Sr-Nd isotope constraints

http://hdl.handle.net/10191/17807
http://hdl.handle.net/10191/17807
69c72c3f-3612-4d2e-ac68-5bfb270bdb13
名前 / ファイル ライセンス アクション
ZC_106(6)_426-441.pdf ZC_106(6)_426-441.pdf (1.6 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2012-04-11
タイトル
言語 en
タイトル An AFC (assimilation and fractional crystallization) process as the petrogenesis of andesites from the Pliocene Myojin-iwa Formation, the back-arc side of the Northeast Japan : combined major-and trace-element and Sr-Nd isotope constraints
言語
言語 eng
キーワード
主題Scheme Other
主題 back-arc volcanism
キーワード
主題Scheme Other
主題 Northeast Japan
キーワード
主題Scheme Other
主題 Pliocene
キーワード
主題Scheme Other
主題 andesite
キーワード
主題Scheme Other
主題 Sr and Nd isotopes
キーワード
主題Scheme Other
主題 AFC process
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ journal article
その他のタイトル
その他のタイトル 東北日本背弧側に産する鮮新統明神岩層の安山岩類の成因 : AFCプロセス ; 主要・微量元素組成およびSr・Nd同位体組成からの制約
言語 ja
著者 Kondo, Hiromi

× Kondo, Hiromi

WEKO 41482

en Kondo, Hiromi

Search repository
Shuto, Kenji

× Shuto, Kenji

WEKO 41483

en Shuto, Kenji

Search repository
Fukase, Masayuki

× Fukase, Masayuki

WEKO 41484

en Fukase, Masayuki

Search repository
著者別名
識別子 41485
識別子Scheme WEKO
姓名 近藤, 裕美
言語 ja
著者別名
識別子 41486
識別子Scheme WEKO
姓名 周藤, 賢治
言語 ja
著者別名
識別子 41487
識別子Scheme WEKO
姓名 深瀬, 雅幸
言語 ja
抄録
内容記述タイプ Abstract
内容記述 Andesitic rocks, of the Pliocene Myojin-iwa volcanic field, in the northern part of Niigata Prefecture, Northeast Japan, show transitional chemical characteristics between typical calc-alkaline and tholeiitic series. The most primitive basaltic andesite among these andesitic rocks (the Myojin-iwa Formation) has geochemical characteristics similar to those of other Pliocene-Quaternary basaltic rocks from the back-arc side of the NE Japan, and has initial Sr isotope ratio slightly higher than those of the latter basaltic rocks. Andesites from the Myojin-iwa area show SiO_2 contents ranging from 53.3% to 62.8, and initial Sr and Nd isotope ratios vary from 0.70324 to 0.70378 and 0.512791 to 0.512926, respectively. The initial Sr isotope ratios display positive correlation with SiO_2, and their initial Nd isotope ratios gradually decrease with increasing SiO_2. This suggests that the genesis of andesites from the area can not be attributed to simple fractional crystallization of the primary basaltic magma, but to an assimilation and fractional crystallization (AFC) process. Based on petrographical evidence, major and trace element compositions and Sr-Nd isotope systematics, the Paleogene granitoid rocks constituting the upper crust beneath the Myojin-iwa and surrounding areas are the possible candidates for assimilants. An AFC model using the granitoid rocks as the assimilant can successfully reproduce the chemical variations of the andesites from the Myojin-iwa Formation by assuming the γ values (ratio of the rate of assimilation to the rate of fractional crystallization) of less than 0.2.
言語 en
抄録
内容記述タイプ Abstract
内容記述 東北日本の背弧側(新潟県北部)には,鮮新世(約3Ma)の主に安山岩質の溶岩および火砕岩からなる明神岩層が分布する.これら安山岩類の斑晶鉱物組み合わせ,斑晶鉱物の化学組成,全岩の主要・微量元素組成などの特徴は,安山岩の組成変化の主な要因が,斑晶鉱物の分別にあることを示唆している.しかし,安山岩類のSrI値はSiO_2量の増加とともに高くなり,NdI値は逆にSiO_2量の増加とともに低くなる傾向を示す.このことは,これらの安山岩類は玄武岩質マグマからの単純な分別結晶作用によって形成されたものではないことを示している.これらのことから,明神岩層の周辺に分布する漸新世の花崗岩質岩石と先第三系堆積岩(これらは新潟地域の上部地殻の主な構成岩である)の同化作用の影響について検討した.その結果,安山岩類の化学組成および同位体組成の変化は,玄武岩質マグマが花崗岩質岩石を同化しながら分別結晶作用したことによって説明されることが明らかにされた.
言語 ja
書誌情報 ja : 地質学雑誌

巻 106, 号 6, p. 426-441, 発行日 2000-06
出版者
言語 ja
出版者 日本地質学会
ISSN
収録物識別子タイプ ISSN
収録物識別子 0016-7630
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AN00141768
DOI
識別子タイプ DOI
関連識別子 http://doi.org/10.5575/geosoc.106.426
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
著者版フラグ
値 publisher
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