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タイトルヨミ
エンカイ シュウヘン ノ イクツカノ チュウシンセイ カラ ダイ4キ ニ カケテノ カセイガン ルイ ノ チキュウ カガク セイナン ニホン シマンネケン トウブ オヨビ オキ ドウゼン カラノ レイ
日本語以外のタイトル
Geochemistry of Some Miocene to Quaternary Igneous Rocks Bordering an Ensialic Marginal Basin - An Example from Eastern Shimane Prefecture and Oki Dozen Island, Southwest Japan
ファイル
言語
英語
著者
モリス P.A.
内容記述(抄録等)
Major element oxide analyses of Miocene to Quaternary igneous rocks from eastern Shimane Prefecture and Oki Dozen Island show that although arc-related volcanism is dominant in this area, alkaline and tholeiitic rocks are also widespread.
The oldest samples (Dolerites and Omori Formation) are a suite of tholeiitic to mildly calc-alkaline eruptives and intrusives, the latter mutually related by low-pressure fractional crystallization. Younger rocks of the Matsue Formation are alkaline to transitional basalts, some containing conspicuous biotite, with accordingly high K_2O/Na_2O, Volcanic rocks of Oki Dozen Island are an alkali basalt-trachyte suite, related by low-pressure fractionation. The lowermost Pliocene Wakurayama Andesite is succeeded by alkaline to transitional basalts sampled from south of Yasugi City and from Daikon Jima Island.
The oldest tholeiitic rocks coincide with opening of the Japan Sea, and their chemistry is comparable with that from the initial magmatic stages of other ensialic marginal basins. Younger rocks have source regions variably contaminated either by fluids derived from the downgoing oceanic crust beneath the area, or result from hybridisation of magma with the overlying mantle wedge.
掲載誌名
島根大学理学部紀要
20
開始ページ
115
終了ページ
133
ISSN
03879925
発行日
1986-12-25
NCID
AN00108106
出版者
島根大学理学部
出版者別表記
The Faculty of Science, Shimane University
資料タイプ
紀要論文
部局
総合理工学部
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