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  1. 050 理学部
  2. 20 紀要
  3. 02 Science reports of Niigata University. (Geology)
  4. No.24
  1. 0 資料タイプ別
  2. 03 紀要論文

Middle Miocene back-arc volcanism in the Tappi-zaki area, Northeast Japan arc : plagioclase K-Ar age constraints

http://hdl.handle.net/10191/12944
http://hdl.handle.net/10191/12944
554bbb6b-f215-4fcf-a94d-1b14be54f5f2
名前 / ファイル ライセンス アクション
24_91-108.pdf 24_91-108.pdf (6.0 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2017-09-04
タイトル
タイトル Middle Miocene back-arc volcanism in the Tappi-zaki area, Northeast Japan arc : plagioclase K-Ar age constraints
タイトル
言語 en
タイトル Middle Miocene back-arc volcanism in the Tappi-zaki area, Northeast Japan arc : plagioclase K-Ar age constraints
言語
言語 eng
キーワード
主題Scheme Other
主題 K-Ar dating
キーワード
主題Scheme Other
主題 Minmaya rhyolites
キーワード
主題Scheme Other
主題 Northeast Japan arc
キーワード
主題Scheme Other
主題 Tappi-zaki
キーワード
主題Scheme Other
主題 volcanic rocks
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
著者 Watanabe, Naoki

× Watanabe, Naoki

WEKO 54400

Watanabe, Naoki

Search repository
Itaya, Tetsumaru

× Itaya, Tetsumaru

WEKO 54401

Itaya, Tetsumaru

Search repository
Ohki, Jun'ichi

× Ohki, Jun'ichi

WEKO 54402

Ohki, Jun'ichi

Search repository
Shuto, Kenji

× Shuto, Kenji

WEKO 54403

Shuto, Kenji

Search repository
抄録
内容記述タイプ Abstract
内容記述 K-Ar ages of whole rock and plagioclase separates were determined for Miocene volcanic rocks from the Tappi-zaki area, Tsugaru Peninsula in the Northeast Japan arc. Whole rock and plagioclase K-Ar ages for the basalt with subophitic groundmass are identical within analytical errors. On the other hand, whole rock K-Ar ages for the basalt, andesite and dacite with intersertal or hyalopilitic groundmass tend to be younger than those of plagioclase separates from the same samples. The discordance between whole rock and plagioclase K-Ar ages may be caused by radiogenic 40Ar loss from whole rock due to alteration and hydration of glass in the groundmass. These suggest that the plagioclase K-Ar ages can be regarded as the formation ages of older volcanic rocks in the study area. The obtained plagioclase K-Ar ages show that the extrusive rocks from the Tappi-zaki area, with a total thickness of about 1,500 m, were formed during 16.5-10 Ma(Middle to Late Miocene), and the dikes and sheets intruded these volcanic piles during the same period of 15-11 Ma. This implies that both the extrusive and intrusive rocks were produced by the same magmatic episode during the Middle to Late Miocene. The younger Minmaya rhyolites yielded a whole rock age of 7.9 Ma.
書誌情報 Science reports of Niigata University. (Geology)
en : Science reports of Niigata University. (Geology)

巻 24, p. 91-108, 発行日 2009-03
出版者
出版者 新潟大学理学部
ISSN
収録物識別子タイプ ISSN
収録物識別子 13491237
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AA11436808
著者版フラグ
値 publisher
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