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  1. B100 理学部/理学研究科
  2. B100d 学位論文
  3. 博士論文(理博・論理博)

[87]Sr/[86]Sr variation in north Pacific sediments: A record of the Milankovitch Cycle in the past 3 million years

http://hdl.handle.net/2237/6630
http://hdl.handle.net/2237/6630
8ad8feff-4028-44dc-9e77-f795448212dc
名前 / ファイル ライセンス アクション
ot5628.pdf ot5628.pdf (1.7 MB)
Item type 学位論文 / Thesis or Dissertation(1)
公開日 2006-06-26
タイトル
タイトル [87]Sr/[86]Sr variation in north Pacific sediments: A record of the Milankovitch Cycle in the past 3 million years
言語 en
その他のタイトル
その他のタイトル 北太平洋堆積物の 87Sr/86Sr 比の変動: 過去300万年間のミランコビッチサイクルの記録
言語 ja
著者 Asahara, Yoshihiro

× Asahara, Yoshihiro

WEKO 12589

en Asahara, Yoshihiro

Search repository
淺原, 良浩

× 淺原, 良浩

WEKO 12590

ja 淺原, 良浩

Search repository
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
抄録
内容記述 Temporal variations of Sr isotopic compositions in the detrital component of north Pacific sediments have been precisely examined. The Sr isotopic composition is controlled by the flux of eolian material from the Asian continent with a high 87Sr/86Sr ratio (0.724 - 0.726) relative to volcanic material with a low ratio (0.703 - 0.705) from the Izu-Ogasawara-Mariana arc and oceanic islands such as Hawaiian Islands. Assuming that the volcanic flux is constant, the temporal variation in Sr isotopic ratio reflects the amount of eolian input from the continent. The major characteristics of the temporal variations and the interpretation of them are summarized as follows: (1) The 87Sr/86Sr records show cyclic fluctuations of 400 ky and 100 ky periodicities which are associated with the eccentricity of the earth's orbit (Milankovitch Cycle). (2) Between 3 and 0.8 Ma, the 87Sr/86Sr ratio in the north central Pacific sediment increases gradually. This reflects an increased eolian input from the arid region in east Asia. The increase must be related to aridification of the Asian continent. (3) The decreased 87Sr/86Sr ratio during the past 0.8 my implies a decreased eolian input. The age of 0.8 Ma may relate to the climatic event Known as the middle Pleistocene shift. All of these phenomena reflect a fluctuation of the eolian flux corresponding to the paleoclimatic cycle of aridity in the Asian continent. The Sr isotopic composition of pelagic sediment in the north Pacific is sensitive to changes in the eolian input reflecting to the aridity of the Asian continent. keywords: 87Sr/86Sr; Pacific sediment; Milankovitch Cycle; Asian loess; paleoclimate
言語 en
内容記述タイプ Abstract
内容記述
内容記述 名古屋大学博士学位論文 学位の種類:博士(理学) (論文) 学位授与年月日:平成11年9月30日
言語 ja
内容記述タイプ Other
言語
言語 eng
資源タイプ
資源 http://purl.org/coar/resource_type/c_db06
タイプ doctoral thesis
書誌情報
発行日 1999-09-30
学位名
言語 ja
学位名 博士(理学)
学位授与機関
学位授与機関識別子Scheme kakenhi
学位授与機関識別子 13901
言語 ja
学位授与機関名 名古屋大学
言語 en
学位授与機関名 Nagoya University
学位授与年度
学位授与年度 1999
学位授与年月日
学位授与年月日 1999-09-30
学位授与番号
学位授与番号 乙第5628号
フォーマット
application/pdf
著者版フラグ
値 publisher
URI
識別子 http://hdl.handle.net/2237/6630
識別子タイプ HDL
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