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斑晶

17 件の記事

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
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QAPF diagram with basalt/andesite field highlighted in yellow. Andesite is distinguished from basalt by SiO2 > 52%.

安山岩の特性と生成メカニズム地球を形作る中間的な火山岩

安山岩火山岩中間組成沈み込み帯
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Ignimbrite, a volcanic rock deposited by pyroclastic flows

火山岩の基礎知識種類・化学組成・形成プロセスの詳細解説

火山岩火成岩玄武岩流紋岩
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Igneous rock, with gray groundmass and white phenocrysts marked.

岩石の基質（マトリクス）とセメンテーションのメカニズム

基質マトリクス斑晶火成岩
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The smooth texture of this basaltic volcanic bomb is aphanitic.

アファナイト（潜晶質岩）の特性と火成岩の分類

アファナイト潜晶質火成岩火山岩
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Granites often have large feldspathic phenocrysts. This granite, from the Swiss side of the Mont Blanc massif, has large white phenocrysts of plagioclase (that have trapezoid shapes when cut through). 1 euro coin (diameter 2.3 cm) for scale.

斑晶（Phenocryst）とは？火成岩の組織から読み解くマグマの履歴

斑晶火成岩斑状組織マグマ
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Porphyritic texture in a granite. This is an intrusive porphyritic rock. The white, square feldspar phenocrysts are much larger than crystals in the surrounding matrix; eastern Sierra Nevada, Rock Creek Canyon, California.

斑状組織（ポルフィリティック）とは？火成岩の結晶サイズが異なる理由を解説

斑状組織ポルフィリティック斑晶石基
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Granites often have large feldspathic phenocrysts. This granite, from the Swiss side of the Mont Blanc massif, has large white phenocrysts of plagioclase (that have trapezoid shapes when cut through). 1 euro coin (diameter 2.3 cm) for scale.

斑晶（Phenocryst）とは？火成岩の組織から読み解く地球の記憶

斑晶火成岩斑状組織地質学
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Igneous rock, with gray groundmass and white phenocrysts marked.

岩石の基質（マトリクス）とセメンテーションのメカニズム

岩石基質マトリクス斑晶
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Augite, tillamook

輝石の一種「輝石（Augite）」の特性と地質学的役割

輝石Augite単斜晶系火成岩
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Minette (a type of lamprophyre), from Jáchymov in the Czech Republic

ラムフィアの地質学的特性と分類超カリウム質火成岩の正体

ラムフィア超カリウム質火成岩ミネット
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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岩石タイプ

火山岩噴出岩マグマ斑晶
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