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タイトルヨミ
シマネ ハントウ ミツ チイキ ニ ブンプ スル ネッスイ ヘンシツ ドレライト ニ サンスル ブドウセキ ノ サンジョウ ト カガク ソセイ ノ カンケイ
日本語以外のタイトル
Relation between occurrence and chemical compositions of prehnite in hydrothermally altered dolerite from Mitsu, Shimane Peninsula, Japan.
ファイル
言語
日本語
著者
永嶌 真理子
岩佐 清香
赤坂 正秀
内容記述(抄録等)
Some secondary minerals such as prehnite, pumpellyite, babingtonite and laumontite occur in druses, veins, and nodular aggregates in the hydrothermally altered Miocene dolerite sills distributing in the north coast of Shimane Peninsula, Japan. This study gives a special focus on the occurrence of prehnite from Mitsu area. Prehnite shows two modes of occurrences: a druse and vein mineral (prehnite I) which is associated with Fe-rich pumpellyite and laumontite, and a replacement of the primary plagioclase (prehnite II). Main minerals in rock specimens containing prehnite I are plagioclase and K-feldspar, but they are not observed in those containing prehnite II. Total Fe_2O_3 contents of prehnite I and II attain up to 8.14 and 8.61 wt.%, respectively. The Fe content of prehnite I varies in a range between 0.33 and 0.44 Fe^<3+> atoms per formula unit (apfu; per O_<10>(OH)_2), whereas the Fe content of prehnite II from 0.01 to 0.46 Fe^<3+> apfu. Their different compositional ranges can be due to the formation process: prehnite I formed directly from hydrothermal fluids and / or vapor in the druses and fissures; prehnite II occurring as pseudomorph of plagioclase was crystallized through alteration process of plagioclase by hydrothermal fluids / vapor. In general, iron in prehnite is ferric in prehnite. However, in some prehnite I grains deficient in Ca, Fe^<2+> is assumed to replace a part of Ca.
主題
Prehnite
Pumpellyite
Mitsu
Shimane Peninsula
掲載誌名
島根大学地球資源環境学研究報告
34
開始ページ
1
終了ページ
8
ISSN
13439774
発行日
2016-03-05
NCID
AA11455176
DOI(SelfDOI)
出版者
島根大学大学院総合理工学研究科地球資源環境学教室
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
業績ID
e28953
部局
(旧組織)大学院総合理工学研究科
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