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peralkaline rock : ウィキペディア英語版 | peralkaline rock Peralkaline rocks include those igneous rocks which have a deficiency of aluminium such that sodium and potassium are in excess of that needed for feldspar. The presence of aegerine (sodium pyroxene) and riebeckite (sodium amphibole) are indicative of peralkaline conditions.〔(Classification of Igneous Rocks )〕 Often observed as a certain indicator for continental rift basin related volcanicity. ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「peralkaline rock」の詳細全文を読む
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