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火山岩

51 件の記事

QAPF diagram with rhyolite field highlighted

流紋岩(ライオライト)の特性と地質学的役割

流紋岩火成岩シリカ火山岩
QAPF diagram with basalt/andesite field highlighted in yellow. Basalt is distinguished from andesite by SiO2 < 52%.

玄武岩の科学地球と太陽系を形作る火成岩の特性

玄武岩火成岩柱状節理枕状溶岩
IUGS classification of aphanitic extrusive igneous rocks to their relative alkali (Na2O + K2O) and silica (SiO2) weight contents. Blue area is roughly where alkaline rocks plot; yellow area where subalkaline rocks plot. Original source: *Le Maitre, R.W. (ed.); 1989: A classification of igneous rocks and glossary of terms, Blackwell Science, Oxford.

火山岩(噴出岩)の形成プロセスと多様な組織・種類

噴出岩火山岩マグマ斑晶