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Title Transcription
シマネケン ダイコンジマ オオツカヤマ セキカッショク スコリアチュウ ノ Mg ニ トンダ カンランセキ ハンショウ ノ セイイン
Title Alternative (English)
Formation of extremely Mg-rich olivine phenocrysts in Otsukayama scoria from Daikonjima, Shimane Prefecture, Japan
File
language
jpn
Author
Ejima, Terumi
Akasaka, Masahide
Description
Occurrence and chemical compositions of olivine phenocrysts in red-brown and black scorias from Otsukayama scoria cone, Daikonjima, Shimane Prefecture, Japan, were investigated to evaluate effect of high temperature oxidation on the scoria. The Otsukayama scoria cone consists of black and red-brown scorias of alkaline olivine basalt. Olivine phenocrysts within the black scoria lack precipitate minerals, but alteration minerals occur along fractures and on the rims of olivine phenocrysts. Olivine phenocrysts in the red-brown scoria contain abundant cryptocrystalline precipitates including hematite and enstatite, which are characteristic in scorias and lavas subjected to high-temperature oxidation. Olivine in the black scoria has normal zoning with Fo_<81.2> cores and Fo_<80.3> rims, whereas those in the red-brown scoria reach 97.7 mol% Fo. The cryptocrystalline precipitates and extremely high Fo contents in olivine phenocrysts in the red-brown scoria are due to high temperature oxidation.
Subject
olivine
scoria
scoria cone
high temperature oxidation
precipitates
Journal Title
島根大学地球資源環境学研究報告
Volume
34
Start Page
15
End Page
20
ISSN
13439774
Published Date
2016-03-05
NCID
AA11455176
DOI(SelfDOI)
Publisher
島根大学大学院総合理工学研究科地球資源環境学教室
NII Type
Departmental Bulletin Paper
Format
PDF
Text Version
出版社版
Gyoseki ID
e28952
OAI-PMH Set
Interdisciplinary Graduate School of Science and Engineering
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